KR20170020385A - Wave-activated power generation system - Google Patents

Abstract

There is provided a wave power generation system capable of improving power generation efficiency while maintaining calmness. The wave power generation system is a wave power generation system that is used together with a breakwaters to dissipate the energy of waves and to generate electricity from the energy of the waves, and has a rotating body and a generator. The breakwater is a breakwater that is installed in water and has a non-permeable wall, but does not have a permeable front wall on the sea side of the non-permeable wall. The rotating body heat is a plurality of rotors arranged on the sea side of the opaque wall and in a direction extending from the opaque wall in plan view. The generator converts the rotational energy of the plurality of rotating bodies to electric power.

Description

{WAVE-ACTIVATED POWER GENERATION SYSTEM}

The present invention relates to a wave power generation system that dissipates the energy of a wave and performs power generation from the energy of the wave.

Recently, renewable energy (natural energy) has attracted attention as a countermeasure for environmental problems such as depletion of fossil fuels and global warming. Among these, wave power generation uses wave generated from the sea covering the area of 70% of the surface of the earth, and is attracting attention as a powerful energy source.

However, from the viewpoint of the safety of navigation of the ship and the securing of fishing grounds, the installation of the structure in the ocean is strictly limited, and the installation of the wave power generation system may become difficult. In view of the related problems, Patent Document 1 discloses a wave power generation system in which a water turbine is installed in a wave chamber of a breakwater installed in a relatively large area in a harbor area. That is, the wave power generation system of Patent Document 1 is easy to install because it utilizes the existing port infrastructure, and it is also possible to reduce the cost of addition of the power generation device or transmission facility.

However, in Patent Document 1, a breakwater having a permeable front wall having a non-permeable wall on the coast side and a vertical slit on the sea side is used. This kind of breakwater reflects the waves from the impermeable wall to secure the calmness of the shore side and dissipates the energy of the waves by the vortices that occur near the longitudinal slits of the front wall. This reduces the reflectance of the wave from the impermeable wall, thereby ensuring not only the coastal side but also the sea side where the ship passes.

Japanese Patent Application Laid-Open No. 2013-2410

However, dissipating the energy of the waves by the front wall of permeability is considered to be necessary from the viewpoint of the sofa, but it is inefficient in view of generation.

An object of the present invention is to provide a wave power generation system capable of improving power generation efficiency while maintaining quietness.

A wave power generation system related to the first aspect of the present invention is a wave power generation system that is used together with a breakwater to dissipate the energy of the wave and to generate electricity from the energy of the wave, and has a rotor column and a generator. The breakwater is installed in water and has a non-permeable wall, but does not have a permeable front wall on the sea side of the non-permeable wall. The rotary body heat is a plurality of rotors arranged on the ocean side of the opaque wall in planar view along the extending direction of the opaque wall. The generator converts the rotational energy of the plurality of rotating bodies to electric power.

Here, on the sea side of the non-permeable wall of the breakwater, a permeable front wall is not provided, and a rotary body heat is provided instead. As a result, the wave energy that has been dissipated by generating a vortex in the vicinity of the water hole (slit) of the front wall in the past is efficiently used for the rotation of the rotating body. That is, from the viewpoint of a sofa, it is possible to prevent the energy loss due to the occurrence of excessive vortex from the viewpoint of power generation while dissipating the energy of the wave as the rotational energy of the rotating body. Therefore, while maintaining calmness, the power generation efficiency can be improved by conventionally using the energy of blue that was intentionally dissipated as an energy source of power generation.

A wave power generation system according to a second aspect of the present invention is a wave power generation system related to the first aspect, wherein neighboring rotating bodies included in the rotating body heat are configured to rotate in opposite directions.

Here, the movement of the adjacent rotating body does not interfere, and the water flow can smoothly pass through the rotating body heat. Therefore, the power generation efficiency can be further improved.

The wave power generation system according to the third aspect of the present invention is a wave power generation system related to the first aspect or the second aspect and further includes at least one of the first rectifying member and the second rectifying member. The rotating axis of the rotating body adjacent to each other included in the rotating body heat is divided into an inflow region through which the waves flowing from the sea side to the impermeable wall side pass or an outflow region through which the waves flowing from the impermeable wall side to the sea side pass do. At least one of the inflow region and the outflow region is formed. The first rectifying member is arranged in the vicinity of the sea side of the outflow region and guides the wave that flows from the sea side to the opaque wall side to the inflow region. The second rectifying member guides a wave, which is disposed in the vicinity of the opaque wall side of the inflow area and flows out from the opaque wall side to the sea side, to the outflow area.

Here, the rotation axes of the adjacent rotating bodies are the inflow or outflow regions of the wave. In addition, when the adjacent rotating bodies included in the rotating body rotate in the opposite directions, the inflow region and the outflow region are alternately formed. Here, the first rectifying member guides the wave to be flowed toward the opaque wall side to the inflow area and / or the wave to be flowed out from the opaque wall side to the outflow area by the second rectifying member do. That is, the first rectifying member can be guided to the inflow region without clogging the wave to be inflowed, and / or guided to the inflow region without clogging the wave to which the second rectifying member is to flow. Therefore, the power generation efficiency can be further improved.

A wave power generation system according to a fourth aspect of the present invention is a wave power generation system related to the third aspect, wherein a rotating body included in the rotating body heat is a wave power generation system that is different from a point corresponding to the inflow area Are arranged at intervals.

A wave power generation system according to a fifth aspect of the present invention is the wave power generation system according to any one of the first to fourth aspects, wherein the rotating bodies included in the rotating body heat are arranged at unequal intervals.

A wave power generation system according to a sixth aspect of the present invention is the wave power generation system according to any one of the first aspect to the fifth aspect, wherein the upper wall part supporting the rotating body extending in the horizontal direction in the non- Respectively.

Here, since the non-permeable wall and the rotating body can be made into a unit, the installation work can be facilitated locally.

A wave generation system according to a seventh aspect of the present invention is a wave generation system according to any one of the first to fifth aspects, further comprising a caisson. The caisson has the opaque wall and a bottom portion and a top wall portion extending from the lower portion and the upper portion of the opaque wall to the sea side, respectively.

A wave power generation system according to an eighth aspect of the present invention is the wave power generation system according to any one of the first aspect to the seventh aspect, wherein the rotary body heat is installed and the water depth of the installation point of the rotary body heat is And a shallower than the water depth.

Here, the installation point of the rotating body is raised by the foundation, and the rotating body is installed at a position where the water level is lower than the point on the sea side than the installation point. Therefore, in this case, the traveling speed of the waves passing between the rotating bodies is increased, and the loss of the energy of the waves is increased. Therefore, the reflectance of blue can be lowered.

A wave power generation system according to a ninth aspect of the present invention is the wave power generation system related to the eighth aspect, wherein the foundation has a vertical surface facing the sea side.

Here, a step is formed in which the water depth rapidly changes in the vicinity of the sea side of the aberration, and the flow velocity of the incoming wave is increased. Therefore, the reflectance of the wave is further lowered, and the power generation efficiency is further improved.

A wave power generation system according to a tenth aspect of the present invention is the wave power generation system according to any one of the first aspect to the ninth aspect, wherein the rotating body is an aberration rotating in a constant direction independently of the wave direction.

Here, both in the forward and backward flows against the impermeable wall, the rotating body rotates in the same direction. Therefore, the power generation efficiency can be further improved.

A wave power generation system according to an eleventh aspect of the present invention is the wave power generation system related to the tenth aspect, wherein the rotating body is a Sovonius aberration.

Here, the Sovonius aberration is used as the rotating body. Therefore, a large torque is generated even at a low rotation speed, and a power generation system that is easy to operate even under low oil flow can be constructed.

A wave power generation system according to a twelfth aspect of the present invention is the wave power generation system according to any one of the first to eleventh aspects, wherein the rotation axis of the rotating body extends in the vertical direction. Incidentally, the term " vertical direction " in the present specification includes cases in which the vertical direction is completely parallel to the vertical direction and the case in which the vertical direction is substantially parallel to the vertical direction.

Here, the generator can be easily installed at an appropriate position on the water surface or the like.

According to the present invention, it is possible to prevent the energy loss from the viewpoint of power generation while dissipating the energy of the wave as the rotation energy of the rotating body from the viewpoint of the sofa. Therefore, the power generation efficiency can be improved by using the wave energy that has conventionally been dissipated intentionally as the energy source of power generation, while maintaining calmness.

1 is a longitudinal sectional view of a wave power generation system according to a first embodiment of the present invention.
2 is a sectional view taken along line II-II in Fig. 1; Fig.
3 is a longitudinal sectional view of a wave power generation system according to a second embodiment of the present invention.
4 is a sectional view taken along line IV-IV in Fig. 3;
5 is a cross-sectional view of a wave power generation system according to a third embodiment of the present invention.
6 is a cross-sectional view of a wave power generation system according to a fourth embodiment of the present invention.
7 is a cross-sectional view of a wave power generation system according to a modification.
8 is a longitudinal sectional view of a wave power generation system according to another modification.
9 is a longitudinal sectional view of a wave power generation system according to still another modification.
10 is a side view of an experimental facility including a wave power generation system according to Embodiment 1. Fig.
11A is a plan view of a wave power generation system according to Embodiment 1 (D _s = 0.084 m).
11B is a plan view (D _s) of the wave power generation system according to Embodiment 1 = 0.140 m).
11C is a plan view of the wave power generation system according to Embodiment 1 (D _s = 0.210 m).
12 is a side view of a power measurement system included in an experimental facility in Example 1. Fig.
13A is a graph (D _s / h = 0.215) showing a comparison result of reflectance in Example 1 (point) and a comparative example (curve).
13B is a graph (D _s / h = 0.350) showing the comparison results of reflectance in Example 1 (point) and Comparative Example (curve).
13c is a graph (D _s / h = 0.525) showing a comparison result of reflectance in Example 1 (point) and Comparative Example (curve).
14A is a graph (D _s / h = 0.215) showing the relationship between the reflectance and the load torque in Example 1. FIG.
14B is a graph (D _s / h = 0.350) showing the relationship between the reflectance and the load torque in Example 1. Fig.
14C is a graph (D _s / h = 0.525) showing the relationship between the reflectance and the load torque in Example 1. Fig.
15A is a graph showing the power acquisition efficiency in the first embodiment (in the case of D _s / h = 0.215).
15B is a graph showing the power acquisition efficiency in the first embodiment (in the case of D _s / h = 0.350).
15C is a graph showing the power acquisition efficiency in the first embodiment (in the case of D _s / h = 0.525).
16A is a graph showing the rotational speed of the aberration in the first embodiment (in the case of D _s / h = 0.215).
16B is a graph (D _s / h = 0.350) showing the rotational speed of the aberration in Example 1. Fig.
16C is a graph (D _s / h = 0.525) showing the rotation speed of the aberration in Example 1. Fig.
17 is a top view (top view) and a side view (bottom view) of an experimental facility including a wave power generation system according to a second embodiment.
18A is a front view of a wave power generation system according to Embodiment 2. Fig.
18B is a plan view of a wave power generation system according to Embodiment 2. Fig.
19A is a graph (l '= 0.24 m) showing the results of comparison of reflectance in Example 2 and Comparative Example;
19B is a graph (l '= 0.34 m) showing the results of comparison of reflectance in Example 2 and Comparative Example.
19c is a graph showing the results of comparison of reflectance in the case of Example 2 and Comparative Example (in the case of l '= 0.44 m).
20A is a graph (case 2) showing the relationship between the energy conversion efficiency and the load torque in Example 2. Fig.
20B is a graph (case 3) showing the relationship between the energy conversion efficiency and the load torque in Example 2. Fig.
21 is a graph showing the reflectance and the maximum flow rate passing between aberrations in Example 2. Fig.
22A is a graph showing the primary conversion efficiency in the second embodiment (in the case of l / l '= 0.91). Fig.
22B is a graph showing the primary conversion efficiency in the second embodiment (in the case of l / l '= 0.45).

Hereinafter, a wave power generation system according to some embodiments of the present invention will be described with reference to the drawings.

<1. First Embodiment>

<1-1. Wave power generation system configuration>

Fig. 1 and Fig. 2 show a wave power generation system 1 according to the first embodiment. Fig. 1 is a longitudinal sectional view of the wave power generation system 1, and Fig. 2 is a sectional view taken along the line II-II in Fig. The wave power generation system 1 is a structure installed in the sea and having a function as a breakwater and a function as a power generation system. 1 and 2, the wave power generation system 1 includes an opaque wall 10 and an aberration column 2 (rotating body heat) provided on the sea side of the opaque wall 10 . The impermeable wall 10 is installed so as to intersect with the traveling direction of the wave and to separate the coast side and the sea side. The aberration column 2 is constituted by arranging a plurality of aberration lenses 20 (rotating bodies) in a direction in which the opaque wall 10 extends in a plan view. As shown in Fig. 2, a line connecting the rotation axis 21 of a plurality of aberrums 20 constituting the aberration column 2 and the non-transmissive wall 10 are substantially parallel in plan view.

As shown in Fig. 1, the non-permeable wall 10 is a rectangular flat plate provided on a groundsill 11 formed on the sea floor and standing in a vertical direction from the foundation 11. In the upper portion of the non-permeable wall 10, a rectangular lid portion 12 (upper wall portion) projects perpendicularly to the non-permeable wall 10, and at the lower portion of the non- Shaped bottom portion 13 protrudes perpendicularly to the non-permeable wall 10. As shown in Fig. That is, the lid portion 12 and the bottom portion 13 extend in the horizontal direction. The bottom part 13 is provided on the base 11 and integrally formed with the bottom part 13 to firmly support the non-permeable wall 10 and the lid part 12. The aberration 20 related to the present embodiment has a rotary shaft 21 extending in the vertical direction so that the lower portion of the rotary shaft 21 is rotatably fixed to the bottom portion 13. [ A generator 3 is provided under the lid portion 12 so that the upper portion of the rotary shaft 21 is rotatably received by the generator 3. The non-permeable wall 10, the lid 12 and the bottom 13 constitute a caisson and are, for example, made of concrete. The foundation (11) can also be made of concrete.

The base 11 also plays a role of stably supporting the caisson or the aberration column 2, but may also lower the reflectance of blue. It is also possible to increase the power generation efficiency. That is, the setting position of the aberration 20 is raised by the base 11 (and the bottom portion 13), and the aberration 20 is provided at a position where the water level is low (shallow). In this case, The speed of progress of the wave passing through the center becomes faster, and the loss of energy of the wave becomes larger. The base 11 of the present embodiment extends between the opaque wall 10 and the aberration column 2 and is inclined downward toward the sea side in the vicinity of the sea side of the aberration column 2.

The non-permeable wall 10 is a structure that constitutes a breakwater and reflects the waves from the sea side to return it to the sea side. The impermeable wall 10 has a vertical plane on the sea side. The surface level of the sea surface varies depending on the tide of the fresh water and the weather conditions. However, the non-permeable wall 10 related to the present embodiment is a height of about the sea surface at an arbitrary time under ordinary weather conditions. In addition, the opaque wall 10 and the aberration column 2 are arranged at regular intervals, as in the case of forming the water retention chamber.

The wave that has reached the aberration column 2 from the sea side passes through the aberration column 2 and collides with the opaque wall 10 to be reflected. Then, the reflected wave passes again through the aberration column 2 and returns to the sea side. In the meantime, the aberration 20 is rotated by the action of the wave passing through the aberration column 2, and the energy of the wave is converted into the rotational energy of the aberration 20. That is, the aberration column 2, along with the impermeable wall 10, serves as wave dissipation works for dissipating the energy of the wave. Although the above-mentioned aberration column 2 is provided on the ocean side of the non-permeable wall 10, a permeable front wall having a conventional permeable hole (see Patent Document 1) is not provided. In this respect, it can be said that the aberration column 2 is a substitute for the permeable front wall used as a conventional breakwater.

The aberration 20 related to the present embodiment is an aberration that rotates in a constant direction without depending on the wave direction. Therefore, both at the time of an incoming wave to the opaque wall 10 and at the time of a backwash wave, each aberration 20 rotates in the same direction and contributes to power generation. 1, each aberration 20 associated with the present embodiment includes a plurality of stages (in this embodiment, three stages) of a plurality of stages stacked in the vertical direction having a common rotation axis 21, water turbine (20A to 20C). Therefore, the aberration 20 is a general property of the Sovnesi's aberration, and generates a large torque at a low rotation and has a property of being easy to operate at a low flow velocity. Incidentally, in another embodiment, each aberration 20 may be configured in a single stage. The aberration 20 related to the present embodiment is arranged so that at least a part of the Sovoneys aberration 20A to 20C arranged in the vertical direction exists below the sea surface at an arbitrary time under the ordinary gas phase condition. Therefore, the wave power generation system 1 can rotate all the aberrations 20 at all times without being affected by only the wave trough.

As shown in Fig. 2, the Sovnouis aberration 20A to 20C according to the present embodiment has two aberration wings 22 each having a semicircular shape at a cross-section view. These two aberration wings 22 are arranged in a positional relationship in which one of them is rotated 180 degrees around the rotation axis 21 to overlap with the other. In addition, the aberration blades 22 of the Sovonius aberration adjacent in the up-and-down direction are disposed at positions shifted by a predetermined angle from the periphery of the rotary shaft 21, whereby the rotation of the entire aberration 20 becomes smooth . Incidentally, in this embodiment, the angle of this difference is set to 120 deg. Divided by 3, which is the number of the pupil aberration, so that the smoothness of the rotation is optimized.

As shown in Fig. 2, the two adjacent aberrators 20 included in the aberration column 2 according to the present embodiment are configured to rotate in opposite directions. That is, the aberration 20 in the clockwise direction and the aberration 20 in the counterclockwise direction are alternately arranged in the aberration column 2. As a result, the wave can smoothly pass through the aberration column 2 without interfering with the movement of the aberration 20 or the direction of the water flow accompanying the aberration 20 between adjacent aberrations 20. Incidentally, a plurality of aberrations 20 included in the aberration column 2 have the same structure except that the rotation directions of two adjacent aberration are different.

In addition, the configuration in which two adjacent aberrations included in the aberration column 2 are rotated in opposite directions (hereinafter referred to as an alternate rotation configuration) is not limited to the wave power generation system 1 according to the present embodiment, . For example, an alternate rotation configuration can be applied to the aberration column arranged in the water chamber of the breakwater having permeable front wall on the sea side of the non-permeable wall described in Patent Document 1. [

As described above, when the aberration 20 is rotated by the action of the wave, the generator 3 receives the rotation force through the rotation shaft 21 and performs power generation. Incidentally, the construction of the generator for converting the rotational energy of the aberration into electric power will be described in detail, so that the detailed description thereof will be omitted here. The configuration of the generator 3 is not a problem as long as the rotational energy of the rotating shaft 21 can be converted into electric power. The arrangement of the generator 3 is not limited to the upper side of the rotary shaft 21 but can be arranged at an arbitrary position.

Then, the electric power generated by the generator 3 is transmitted to a substation on the land side through a transmission facility (not shown). Since the wave power generation system 1 is usually installed in the offshore region so as to achieve the function of the breakwaters, power loss due to transmission is suppressed.

As described above, in the wave power generation system 1, the energy of the wave is efficiently converted into the rotational energy of the aberration 20, and the corresponding rotational energy is converted into electric power by the generator 3. As a result, the energy of the blue light is dissipated and the sofa can be generated, and at the same time, it can efficiently develop from the energy of the blue.

<1-2. Features>

In the wave power generation system 1, the permeable front wall is omitted on the sea side of the non-permeable wall 10 in the breakwater, and the aberration column 2 is provided instead. As a result, the energy of the wave is efficiently used for rotation of the aberration column 2 without being dissipated by the vortex generated in the vicinity of the water hole in the front wall, as in the conventional wave power generation system having the permeable front wall . That is, from the viewpoint of the sofa, the energy loss due to the occurrence of the vortex is prevented from the viewpoint of power generation while dissipating the energy of the wave as the rotational energy of the aberration column 2. Therefore, in the wave power generation system 1, the calmness can be maintained and the power generation efficiency can be increased.

The wave power generation system 1 can be realized, for example, as a port facility of a fishing port, a commercial port, or an evacuation port. In addition, the wave power generation system 1 can be relatively smoothly introduced if there is a need to replace the existing breakwaters due to deterioration or the like.

<2. Second Embodiment>

Next, the wave power generation system 101 related to the second embodiment will be described. Fig. 3 is a longitudinal sectional view of the wave power generation system 101, and Fig. 4 is a sectional view taken on line IV-IV of Fig. The wave power generation system 101 is a structure that is installed in the sea and has a function as a breakwater and a function as a power generation system and is common to many points in the wave power generation system 1 related to the first embodiment. Hereinafter, differences from the first embodiment will be mainly described, and the same constituent elements as those of the first embodiment will be denoted by the same reference numerals, and a detailed description thereof will be omitted.

The wave power generation system 101 is constructed in the same manner as in the first embodiment except that the non-permeable wall 10, the lid portion 12 (upper wall portion), the bottom portion 13, the foundation 11, the aberration column 2, 3, the first rectifying member 150 and the second rectifying member 160 are provided. The main difference between the wave power generation system 101 related to the present embodiment and the wave power generation system 1 related to the first embodiment is that whether or not the first rectifying member 50 and the second rectifying member 60 exist have.

In the aberration column 2 according to the second embodiment, as in the first embodiment, a plurality of aberration lenses 120 (rotating bodies) are arranged at regular intervals from the opaque wall 10, And arranged along the direction in which the wall 10 extends. However, unlike the first embodiment, each aberration 120 does not have a plurality of stages in which the Sovonius aberration is stacked in the vertical direction and has a one-end structure. However, the Sovonius aberration 120 of the second embodiment may have a multi-stage configuration.

The aberration section 120 has a shaft top 131, a wing section 132, and a shaft section 133 in this order from the top to the bottom. The wing portion 132 includes an upper flange 134, a bottom flange 135, and a pair of aberration wings 136.

Each aberration wing 136 has a semi-cylindrical shape and the aberration 120 is a saberoid type in which the two aberration wings 136 are arranged to be rotationally symmetric with respect to the rotation axis 121 of the aberration 120 by 180 . Therefore, as in the first embodiment, the aberration 120 can be rotated in only one direction. Each aberration wing 136 has an upper flange 134 connected to an upper end portion and a lower flange 135 connected to a lower end portion to reach the outer periphery of both flanges 134 and 135 but does not project outward from the outer periphery. The upper portion of the aberration wing 136 is exposed above the water surface 114 at all times under normal weather conditions. The shaft upper portion 131 and the shaft receiving portion 133 are parallel to the opaque wall 10 and are disposed at a certain distance from the opaque wall 10.

The lower end of the shaft portion 131 is connected to the center of the surface of the upper flange 134 such that the shaft upper portion 131 and the upper flange 134 are coaxial. The shaft portion 131 extends in the vertical direction and is inserted into the through hole 115 formed in the lid portion 12 to be axially supported on the rotary member. Similarly, the upper end of the shaft portion 133 is connected to the center of the lower surface of the lower flange 135, so that the shaft portion 133 and the lower flange 135 are on the same axis. The shrinking portion 133 extends in the vertical direction and the lower end of the shaft portion 133 is inserted into the shaft hole 116 provided on the surface of the bottom portion 13 and is pivoted to the rotary material.

As shown in Fig. 4, two adjacent aberration aber 120 related to the present embodiment are also configured to rotate in opposite directions. That is, an aberration 120 (hereinafter referred to as a first aberration 120A) rotating in a counterclockwise direction in plan view and an aberration rotating clockwise in a plan view (hereinafter referred to as a second aberration 120B) Are arranged alternately in accordance with the arrangement direction of the aberration 120. The first aberration 120a and the second aberration 120B which are adjacent to each other in the cross sectional view have a shape symmetrical with respect to a straight line equidistant from the rotational axis 121 of the positive aberrations 120A and 120B Have. When the waves pass between the aberration rows 2, the two aberration blades 136 of the first aberration 120A are set such that all of the first aberrations 120a rotate counterclockwise in plan view It is pushed to blue. Similarly, the two aberration wings 136 of the second aberration 120B are both pushed to the blue so that the corresponding second aberration 120B rotates clockwise in plan view.

As described above, the aberrations 120A and 120B adjacent to each other are rotated in the opposite directions. Therefore, between the rotation axis 121 of the first aberration 120a adjacent to the rotation axis 121 of the second aberration 120B and the rotation axis 121 of the second aberration 120B, The inflow region 118 through which F1 passes or the outflow region 119 through which the blue F2 to flow out from the opaque wall side to the sea side passes. The inflow region 118 and the outflow region 119 are alternately formed in accordance with the arrangement direction of the aberration 120.

In the present embodiment, a plurality of first rectifying members 150 exist to form heat, and a plurality of second rectifying members 160 exist to form heat. Each of the first rectifying member 150 and the second rectifying member 160 extends in the vertical direction and each upper end portion is fixed to the lower surface of the lid portion 12 and each lower end portion is fixed to the surface of the bottom portion 13 . The first rectifying member 150 and the second rectifying member 160 have a rectangular parallelepiped shape. As shown in Fig. 4, the cross section (the cross section in the horizontal direction) is square. The diagonal dimension of the square cross section of the first rectifying member 150 and the second rectifying member 160 is substantially equal to the diameter of the upper flange 134 and the lower flange 135 of the aberration 120.

The first rectifying member 150 is disposed in the vicinity of the sea side of the outflow region 119 and directs one of the four vertices of the transverse section (hereinafter, referred to as a first vertex 151) toward the outflow region 119 do. More specifically, the first rectifying member 150 is configured such that the imaginary line 142 passing through the first vertex 151 of the first rectifying member 150 and the second vertex 152 diagonally opposite to the first rectifying member 150 in the cross- Are disposed so as to pass through or near the midpoint of the virtual line segment 141 passing through the point corresponding to the first aberration 120a and the second axis 120b of the second aberration 120B. The virtual line 142 and the virtual line segment 141 are orthogonal. Although the first vertex 151 is located on the sea side than the imaginary line segment 141, the first rectifying member 150 has a gap formed between the adjacent first aberration 120a and the second aberration 120B .

The second rectifying member 160 is disposed in the vicinity of the opaque wall 10 side of the inflow region 118 to form one of the four vertices of the cross section (hereinafter referred to as a first vertex 161) As shown in FIG. More specifically, the second rectifying member 160 is configured such that the imaginary line 144 passing through the first vertex 161 of the second rectifying member 160 and the second vertex 162 diagonal to the second rectifying member 160 in the cross- Are disposed so as to pass through or near the midpoint of an imaginary line segment 143 passing through a point corresponding to the first aberration 120a and the second axis 120b of the second aberration 120B. The virtual line 144 and the virtual line segment 143 are orthogonal. The first vertex 161 is on the side of the opaque wall 10 rather than the imaginary line 143 and the second rectifying member 160 enters a gap formed between adjacent aberrations 120.

Next, a structure in which the wave power generation system 101 generates electricity while soaking the wave is described. 4, the wave F1 to be flowed toward the non-permeable wall 10 has a second vertex 152 located on the sea side of the first rectifying member 150 disposed on the downstream side of the outflow region 119, And is guided to the inflow region 118 by being divided into left and right (upward and downward directions in FIG. Thereafter, the wave F1 pushes the inner peripheral surfaces of the aberration blades 136 of the first aberration 120A and the second aberration 120B to rotate the positive aberrations 120A and 120B. At this time, in a plan view, the first aberration 120A rotates in a counterclockwise direction and the second aberration 120B rotates in a clockwise direction. The wave F1 rotates the first aberration 120a and the second aberration 120B and then rotates the first aberration 120a and the second aberration 120b at the first side of the second rectifying member 160, It collides with each corner corresponding to the vertex 161 and flows into the outflow region 119 without clogging.

The wave F2 to flow out from the side of the non-permeable wall 10 is located at the second vertex (second side) located on the side of the non-transmitting wall 10 of the second rectifying member 160 disposed on the downstream side of the inflow region 118 162 and is guided to the outflow region 119 by being divided into left and right portions. Thereafter, the blue F2 pushes the inner peripheral surfaces of the aberration blades 136 of the first aberration 120A and the second aberration 120B to rotate the positive aberrations 120A and 120B. At this time, in a plan view, the first aberration 120A rotates in a counterclockwise direction and the second aberration 120B rotates in a clockwise direction. The wave F2 is generated by rotating the first aberration 120a and the second aberration 120B and then rotating the first aberration 120a and the second aberration 120b on the side of the opaque wall 10 of the first rectifying member 150 disposed on the downstream side of the outflow region 119 And then flows out to the sea side without clogging.

As described above, the entirety of the waves F1 and F2 to be introduced and discharged is guided by the first rectifying member 150 and the second rectifying member 160 to the inflow region 118 and the outflow region 119, 120 A and the second aberration 120 B in one direction. In other words, this breakwater can convert most of the energy of the wave into the rotational energy of the aberration 120 and soak it. The waves F1 and F2 guide the water flow to the inner peripheral surface of the aberration blades 136 of the aberration 120 by the first rectifying member 150 and the second rectifying member 160, Since the water flow is not guided on the outer peripheral surface, the water resistance is not resistant to the rotation of the aberration 120.

As described above, when the aberration 120 rotates, the generator 3 receives the rotational force via the shaft top 131 and performs power generation. 3, the generator 3 is disposed on the lid unit 12, but it may be arranged on the lower side of the lid unit 12 as in the first embodiment. Also in this embodiment, as in the first embodiment, the arrangement and configuration of the generator 3 can be appropriately selected. The electric power generated by the generator 3 is transmitted to a substation on the land side through a transmission facility (not shown). Incidentally, as shown in Fig. 3, the non-permeable wall 10 may be provided so as to be in contact with or substantially in contact with the shore 125.

<3. Third Embodiment>

Next, the wave power generation system 201 related to the third embodiment will be described. 5 is a cross-sectional view of the wave power generation system 201. Fig. The wave power generation system 201 is common in many respects with the wave power generation systems 1, 101 related to the first and second embodiments. Hereinafter, differences from the first and second embodiments will be mainly described, and the same constituent elements as those of the first and second embodiments will be denoted by the same reference numerals, and a detailed description thereof will be omitted.

The wave power generation system 201 includes the opaque wall 10, the lid portion 12 (upper wall portion), the bottom portion 13, the base 11, the aberration column 2, and the like in the same manner as in the first and second embodiments. And a generator (3), as well as a first rectifying member (250) and a second rectifying member (260). The main difference between the wave power generation system 201 related to the present embodiment and the wave power generation system 101 related to the second embodiment lies in the distance between the aberrations 120 included in the aberration column 2.

More specifically, in the present embodiment, the first aberration 120a and the second aberration 120b, which are adjacent to each other, are disposed substantially without gaps. By doing so, the gap between the first aberration 120a and the second aberration 120B can be reduced without largely contributing to the rotation of the aberrations 120a, 120b. That is, the power generation efficiency can be improved.

In the present embodiment, a plurality of first rectifying members 250 are formed to form heat, and a plurality of second rectifying members 260 are also present to form heat. The first and second rectifying members 250 and 260 are different from the first and second rectifying members 150 and 160 according to the second embodiment only in the cross sectional shape and have the same configuration I have.

5, the cross-sectional shape of the first rectifying member 250 is a shape having four vertexes surrounded by a pair of adjacent curved lines 253 and a pair of adjacent line segments 254. As shown in Fig. The first rectifying member 250 is disposed in the vicinity of the sea side of the outflow region 119 and is one of the four vertices of the transverse section and has an intersection (hereinafter referred to as a first vertex 251) of a set of curves 253 To the outflow region 119 side. The second vertex 252 is an intersection of a set of line segments 254. More specifically, the first rectifying member 250 is configured such that the imaginary line 242 passing through the first vertex 251 of the first rectifying member 250 and the second vertex 252 diagonal to the first rectifying member 250 in the cross- Are disposed so as to pass through the center of the imaginary line segment 241 passing through a point corresponding to the first aberration 120a and the rotation axis 121 of the second aberration 120B. The virtual line 242 and the virtual line segment 241 are orthogonal. The first vertex 251 is located closer to the sea than the imaginary line segment 241 and the first rectifying member 250 enters a gap formed between adjacent aberrations 120). The dimension between the remaining vertexes of the four vertexes of the transverse section of the first rectifying member 250 that are not the first vertex 251 and the second vertex 252 is greater than the dimension between the vertexes of the flange 134 and the lower flange 135). A curve 253 extending in the transverse section of the first rectifying member 250 and extending in the lateral direction (the up-and-down direction in FIG. 5, the same hereinafter) at the corner corresponding to the first vertex 251 corresponds to the aberration 120 ) Upper flange 134 and the lower flange 135, and is in the shape of a circular arc having a slightly larger diameter.

The cross-sectional shape of the second rectifying member 260 is a shape having four vertices surrounded by a pair of adjacent curves 263 and a pair of adjacent line segments 264. [ The second rectifying member 260 is disposed in the vicinity of the opaque wall 10 side of the inflow region 118 and is one of the four vertices of its cross section and is located at an intersection of a set of curves 263 Vertex 261 ") toward the inflow region 118 side. The second vertex 262 is an intersection of a set of line segments 264. More specifically, the second rectifying member 260 is configured such that the imaginary line 244 passing through the first vertex 261 of the second rectifying member 260 and the second vertex 262 diagonal to the second rectifying member 260 in the cross- Are disposed so as to pass through or near the midpoint of an imaginary line segment 243 passing through a point corresponding to the first aberration 120a and the second axis 120b of the second aberration 120B. In addition, the virtual line 244 and the virtual line segment 243 are orthogonal. The first vertex 261 is located closer to the opaque wall 10 than the imaginary line segment 243 and the second rectifying member 260 enters a gap formed between adjacent aberrations 120. The dimensions of the remaining vertexes other than the first vertex 261 and the second vertex 262 among the four vertexes of the transverse section of the second rectifying member 260 are determined by the dimensions of the flange 134 and the bottom flange 135). A curved line 263 extending in the transverse section of the second rectifying member 260 and extending in the left-right direction (the up-and-down direction in FIG. 5, the same hereinafter) at the corner corresponding to the first vertex 261, And is concentric with the upper flange 134 and the lower flange 135 and is in the shape of a circular arc having a slightly larger diameter.

With the above-described configuration, in the wave power generation system 201 related to the third embodiment, the power generation efficiency can be improved as compared with the wave power generation systems 1 and 101 as already mentioned.

<4. Fourth Embodiment>

Next, the wave power generation system 301 related to the fourth embodiment will be described. 6 is a cross-sectional view of the wave power generation system 301. Fig. The wave power generation system 301 is common in many respects with the wave power generation systems 1, 101, and 201 related to the first to third embodiments. Hereinafter, differences from the first to third embodiments will be mainly described, and the same constituent elements as those of the first to third embodiments will be denoted by the same reference numerals, and a detailed description thereof will be omitted.

The wave power generation system 301 includes the opaque wall 10, the lid portion 12 (upper wall portion), the bottom portion 13, the base 11, the aberration column 2, And a generator (3), as well as a first rectifying member (350) and a second rectifying member (360). The main difference between the wave power generation system 301 according to the present embodiment and the wave power generation systems 101 and 202 related to the second and third embodiments is the distance between the aberrations 120 included in the aberration column 2 .

More specifically, in the wave power generation system 301, the aberrations 120 included in the aberration column 2 are arranged at unequal intervals. Particularly, in the present embodiment, the aberrations 120 included in the aberration column 2 are arranged at different intervals at a point corresponding to the inflow region 118 and a point corresponding to the outflow region 119. Although the interval between adjacent aberrations 120 at the position corresponding to the outflow region 119 is wider than the interval between adjacent aberrations 120 at the position corresponding to the inflow region 118, It is also possible to reverse.

In this embodiment, since the breakwater does not have a permeable front wall on the sea side of the non-permeable wall 10, the degree of freedom of the installation position of the aberration 120 is high. Therefore, the inflow and outflow amount of the wave to the breakwater for improving the power generation efficiency can be determined for each installation site, and furthermore, the intervals between adjacent aberrations 120 included in the aberration column 2 can be separately set. Particularly, it is meaningful to be able to set the interval at the position corresponding to the inflow area 118 and the interval at the position corresponding to the outflow area 119 separately.

<5. Modifications>

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the present invention. For example, the following changes are possible. The gist of the following modified examples can be appropriately combined.

<5-1>

In the above-described embodiment, the Sovonis aberration is used as the rotating body, but the present invention is not limited to this, and other types of aberration may be used. However, from the viewpoint of power generation efficiency, it is preferable to use an aberration that rotates in a constant direction irrespective of the direction of the wave, so that power generation can be easily performed even in the inflow and the reverse flow. Examples of such aberration include a crossflow aberration in addition to the Sovonius aberration. It is also possible to use an aberration modified to have different numbers of aberration wings such as three, four, etc. for the aberration of the above embodiment.

<5-2>

In the above embodiment, the aberration rows 2 are assumed to have an alternate rotation configuration. However, the present invention is not limited to this. For example, all of the aberrations 20 may be configured to rotate in the same direction.

<5-3>

In the above-described embodiment, the upper and lower sides of the rotation axis of the aberration are axially supported, but only the upper side or the lower side may be axially supported.

<5-4>

In the above embodiment, the rotation axis of the aberration is directly connected to the generator, but it may be indirectly connected to the generator through another device such as a hydraulic pump.

<5-5>

In the second to fourth embodiments, although the rotary shaft is disposed so as to be divided above and below the center wing portion, it may penetrate the wing portion 132.

<5-6>

In the second to fourth embodiments, the upper portion of the wing portion 132 is exposed above the water surface, but may be always submerged.

<5-7>

In the above embodiment, the wave power generation system is installed in the sea, but it may be installed in a river or a lake.

<5-8>

In the second to fourth embodiments, one of the first rectifying member and the second rectifying member may be omitted.

<5-9>

In the above embodiment, the sea side of the base 11 is configured to form an inclined surface with respect to the vertical direction. However, as shown in Fig. 8, in place of the foundation 11, a foundation 11A having a vertical face 111A may be provided on the sea side. 9, the base 11B may be formed again on the bottom portion 13 provided on the base 11. In this case, The base 11B shown in Fig. 9 is a base of a rectangular parallelepiped which is formed only on the lower portion of the aberration 20 and does not reach the opaque wall 10 in the vertical cross-section. It can be based on reaching. Incidentally, in this modified example, when the base is a rectangular shape rather than a trapezoidal shape as shown in Fig. 1 at the vertical section, a step is formed at a position directly under the aberration 20 and suddenly changing its depth in the vicinity of the sea side The wavelength of the incoming wave changes and the flow rate increases. Therefore, in this case, it is expected that the effect of reducing the reflectance of the wave and the effect of improving the power generation efficiency are improved.

Example  One

Hereinafter, a first embodiment of the present invention will be described. However, the present invention is not limited to the following first embodiment.

<1. Experimental conditions>

Here, as a first embodiment, a wave power generation system shown in Fig. 10 was manufactured by using a wave basin. More specifically, the size of the wave-wave bath was set to 20.00 m in length, 0.50 m in width, 0.50 m in height, and constant at a depth h of 0.40 m. A wave plate was installed on one end side (sea side) in the longitudinal direction of the wave wave water tank, and a water turbine column was installed so that the rotation axis of the water turbine was located at a distance of 13.68 m from the wave plate to the other end side (coast side). Each aberration included in the aberration column was a Sovonius aberration of a three-stage configuration as described in the first embodiment. In addition, three kinds of aberration heat are prepared, and the diameter D _s [m] of the Sauvonious aberration of each aberration column is set to D _s = 0.084, 0.140, 0.210. The order number included in the aberration sequence is expressed by D _s (See Fig. 11A) for D = 0.040, three (see Fig. 11B) for D _s = 0.140 and two for D _s = 0.210 (see Fig. 11C). With respect to any aberration column, an alternate rotation configuration was adopted. Can inter-vehicle distance D = D _s +2 a (2a is, wing interstage of the adjacent aberration distance), 2a / D = 0.11 to set such that the (constant), the aberration height H _w is H _w / h is substantially constant at 0.8 . In addition, l [m] = 0.38 again from the aberration column, the impermeable wall was installed on the shore side.

In the wave power generation system according to the first embodiment, the power measurement system shown in Fig. 12 is provided in place of the generator. The rotation axis (aberration axis) of the aberration was supported by a ball bearing using a ball bearing so that the friction was extremely small. The upper end of the aero axle is connected to the magnetic brake, and the load torque T _q [N · m] is given to the aberration axis by the magnetic brake. As the magnetic brake, Perma-TorkHC01-1 made by Japan Window Co., Ltd. was used. In addition, the accelerometer was fixed to the aberration axis, and the rotation speed (angular velocity) R _E [rps] of the aberration was measured between 30 seconds and 80 seconds after the start of the wave at the sampling frequency of 100 Hz. In addition, we installed two capacity type peaks and valleys at approximately 3.5m sea side from aquaduct axis and measured water level fluctuation. In addition, one capacity type wave height system was installed at 0.18m sea side from the water axis and water level fluctuation in the vicinity of a water column was measured. The sampling frequency of the parallax system is 100 Hz. The working wave has a regular wave of a waveform gradient H / L = 0.01 with a period T [s] = 0.81 to 1.67. Incidentally, H is the wave height and L is the wavelength.

<2. Experimental Results and Evaluation>

<2-1. Reflectivity>

The reflectance K _r in the case of T _q = 1.1 × 10 ^-3 N · m results in "points" in FIGS. 13A to 13C. 13A to 13C show data in the case of D _s / h = 0.215, 0.350, and 0.525, respectively. Incidentally, the reflectance K _r is calculated based on the results of measurement by two capacitive wave peaks of about 3.5 m from the aberration column, and based on the input / reflected wave separation estimation method (Gouda et al., 1976, Separation Estimation Method, Port Technical Research Institute, No.248). It is also assumed that a model of a longitudinal slit upright sofa ball (comparative example) in which circular cylinders are used in place of the aberration column (the other conditions are the same as those in the first embodiment described above) was calculated as the reflectance _r to theoretical K by previous studies, and the results indicated by the "curve" in Fig. 13a ~ Fig. 13c. In addition, the circumferential row in the comparison row is arranged at the same interval as the circumferential row having the same diameter as the above-mentioned aberration row.

13A to 13C, the reflectance K _r tends to be lower in the first embodiment than in the comparative example. This tendency was remarkable especially on the short period side. This can be attributed to the fact that a large flow of shear flows occurs due to the water flow passing through the surface of the aberration existing below the water surface and the energy is lost. It can be considered that the larger the diameter D _s of the aberration is, the larger the area of the aberration surface is, and the greater the energy of the blue is dissipated, and the reduction of the reflectance K _r is connected. That is, it was found that the sofa can be sufficiently carried out by the aberration heat without providing the front wall of permeability. In addition, in order to maintain calmness of the sea area, it was understood that diameter of aberration should be decided according to depth of water and wave period. When the diameter of the aberration is set to about 20% to 50% of the water depth, it is possible to realize a reflectance of about 30% to 80%. Particularly when the diameter of the aberration is about 50% It is possible to realize a reflectance of about 30% to 50%.

Further, in the wave power generation system related to the above embodiment, since the generator is mounted on the aberration axis, a load (brake) is applied to the aberration shaft by the generator, and the rotational speed of the aberration axis is expected to be reduced. Thereupon, in order to evaluate the influence, the rotational speed R _E and the reflectance K _r with respect to various load torques T _q were measured, but the results shown in Figs. 14A to 14C were obtained. Figs. 14A to 14C show data in the case of D _s / h = 0.215, 0.350, and 0.525, respectively.

14A to 14C, it can be seen that, with the increase of the load torque T _q , the rotational speed R _E decreases, but a meaningful change can not be seen in the reflectance K _r . That is, it was found that the reflectance is determined in accordance with the structural conditions (the depth condition, the diameter of the aberration, the wave condition such as the period and the wavelength), and the like, without being influenced by the load of the generator. Since the reflectance is constant regardless of the load of the generator, the total amount of dissipation of the energy obtained from the amount of energy dissipated by the occurrence of the vortex formed around the aberration and the amount of energy used for rotating the aberration, It was found that it was constant regardless of the load.

<2-2. Acquisition Power>

The obtained power efficiency K _e with respect to the diameter D _s of various aberrations was calculated according to the following equation, but the results shown in Figs. 15A to 15C were obtained. 15A to 15C show data in the case of D _s / h = 0.215, 0.350, and 0.525, respectively. The following P _p is the acquisition power per unit width obtained by the rotation of the aberration, and P _w is the energy of the blue per unit width. In addition, ρ is the density of water, and g is gravitational acceleration. In the following expression, R _E is an average rotation speed.

According to the previous research, the power generation efficiency (acquisition power efficiency) for the energy of the wave caused by the SABONUS aberration is about 5%. On the other hand, in the wave power generation system according to Embodiment 1, as shown in Figs. 15A to 15C, the maximum value of the acquired power efficiency K _e is 10% or more even for the diameter D _s of any aberration, .

In addition, from the viewpoint of the stability of power generation, it is possible to request that the variation of the rotational speed of the aberration is small. Thereupon, the relationship between the variation trend? At 0.18 m sea side from the aberration axis and the rotation speed R _E of the aberration was examined, but the results shown in Figs. 16A to 16C were obtained. 16A to 16C show data in the case of D _s / h = 0.215, 0.350, and 0.525, respectively.

As shown in Fig. 16A, in the case of D _s / h = 0.215, the peak of the rotational speed was shown twice for one wave. This tendency is considered to be due to the fact that the rotational speed increases when the incident wave passes through the aberration column and increases again when the reflected wave reflected from the impermeable wall propagates to the sea side. As shown in Figs. 16B and 16C, as D _s / h increases to 0.350 and 0.525, the fluctuation of the rotation speed R _E becomes smaller. In other words, if the diameter of the aberration is large, then after the aberration begins to turn once, the moment of inertia acts to make it difficult to have the frequency characteristic of the wave, so that it can be considered to rotate at a stable speed. Therefore, it can be said that it is advantageous that the diameter of the aberration is advantageous from the viewpoint of the stability of the power generation. It is preferable that the diameter of the aberration is preferably 30% or more of the depth of the water and more preferably 50% or more.

Example  2

Hereinafter, a second embodiment of the present invention will be described. However, the present invention is not limited to the following second embodiment.

<1. Experimental conditions>

Here, as the second embodiment, the wave power generation system shown in Figs. 17, 18A and 18B was manufactured by using the wave wave water tank. Specifically, the size of the wave-wave bath was 20.00 m in length, 0.50 m in width and 0.60 m in height, and was constant at a maximum depth h = 0.40 m. A wave plate was installed on one end side (sea side) in the longitudinal direction of the wave wave water tank, and a rotation axis of a water column was installed at a position about 14 m away from the wave plate to the other end side (coast side). In addition, a non-permeable wall was provided on the coast side of l [m] from the axis of rotation of the aberration column. The diameter of the Sovonius aberration was set to D _s [m] = 0.072. The number of orders included in the aberration column was six, and the aberration column was configured to have an alternating rotation configuration in which adjacent aberrations were reversely rotated. Further, the distance D [m] between the sub-frames was set to 1.1 D _s . Each aberration included in the aberration column has a configuration in which the Sovonius aberration of the three-stage configuration described in the first embodiment is changed to a two-stage configuration. In addition, a step 11A of a rectangular parallelepiped extending from the impermeable wall to the sea side by l '[m] and extending in the width direction by a width of the wave-wave bath was prepared, and a water column was arranged on the step 11A .

In the wave power generation system according to the second embodiment, a power measuring system as shown in Fig. 12 is provided instead of the generator, and a load torque T _q [N · m] is given on the aberration axis. In addition, an electron flowmeter manufactured by Alec Electronics Co., Ltd. was installed between the aberrations (sea side) and 0.08 m below the constant water surface, and the flow rate between the aberrations was measured. In addition, the rotation speed ω of the aberration was measured at a sampling frequency of 100 Hz by using an accelerometer (sensor controller) manufactured by ATR Promotions Co., Ltd. at the top of the aberration axis. In addition, two capacity type wave peak systems are installed on the sea side of about 3.5 m from the axis of rotation of the aberration, and the input / reflected wave separation estimation method (Gouda et al., 1976, Estimation of separation of input / reflected wave in irregular wave, .248) was used to obtain the wave height H [m] and the reflectance K _r of the incident wave. The obtained primary conversion efficiency E can be calculated as the obtained power P of the aberration ratio of the wave energy (wave energy) D and ^{Pω (Pω = ρgH 2/8} ) acting on one aberration, the unit of this aberration length The energy conversion efficiency E '= E / H _s converted to sugar was obtained. In addition, H _s [m] is the height of the aberration. The working wave has a periodicity of T [s] = 0.73 to 1.71 and a waveform gradient of H / L = 0.020. Incidentally, H is the wave height and L is the wavelength.

Under the condition of only the step 11A (case 1: comparative example) and under the condition of only the aberration row (case 2: embodiment) and the case of preparing both the step 11A and the aberration row shown in FIG. 17 ), L '= l + 0.04, and l = 0.20 m, 0.30 m, and 0.40 m, respectively. Furthermore, the experiment was conducted by changing l / l 'as l' = 0.44 (constant). Incidentally, the wave power generation system of case 1 is obtained by removing the aberration heat from the wave power generation system of Fig. In the case of the wave power generation system of case 2, the step 11A is removed from the wave power generation system of Fig. 17, and the two-stage aberration column is changed to the three-stage configuration. The experimental conditions for h _s / h and height H _{s in case 1} to case 3 are as follows. In addition, h _s [m] is the water depth at the installation position of the aberration.

<2. Experimental Results and Evaluation>

The reflectance K _r and the maximum flow velocity Vmax passing through the aberration (step 11A) when the step length (length of the step 11A in the coast-sea direction) l 'is changed to l' = 0.24, 0.34, The measurement values at the installation positions of the aberrations) are as shown in Figs. 19A to 19C, respectively. The umax in the figure shows the maximum velocity amplitude that can be obtained from the infinitesimal wave theory at depth h = 0.40 m. In the same figure, it was found that the case 1 in the step 11A has a tendency that the reflectance K _r is higher than 0.6 in general. It was found that case 2, which is only the aberration column, has lower reflectance than case 1 even under any l 'condition. Further, in the case 3 in which the aberration column is provided on the step 11A, K _r is almost the same as case 2 in the case of the single main expectation. However, in the long main expectation, a tendency to significantly decrease the K _r can be seen. As the step 11A is longer, I realized that this was remarkable. On the other hand, Vmax / umax of case 3 is larger than that of case 2. Therefore, by providing an aberration on the step 11A, it can be considered that the flow rate passing between the aberrations is increased, the energy loss is increased, and the reflectance K _r is lowered.

As described above, it was confirmed that the reflectance K _r was lowest in case 3, low in case 2, and maximum in case 1. Therefore, it was confirmed that the sofa performance was improved by the aberration column, and the sofa performance was further improved when the aberration column was placed on the step 11A again.

20A and 20B show the energy conversion efficiency E 'of case 2 and case 3, respectively, when the step length l' = 0.44 (constant) and the load torque T _q is given. In the same figure, the maximum value of E 'in case 3 is about 0.6, in case 2 it is about 0.4, and in case 3, the energy conversion efficiency E' is generally higher than in case 2. Therefore, it has been found that the power generation efficiency is improved by providing the aberration column on the step 11A. More specifically, when the aberration heat is provided above the step 11A, the energy conversion efficiency E 'is improved and the substantially constant load torque T _q = 0.003 N · m), the maximum energy conversion efficiency was obtained. This means that the optimum load torque for obtaining the energy efficiently is constant irrespective of the wave period of the object, and it can be said that a useful knowledge is obtained in the design of the secondary conversion mechanism (the mechanism for operating the generator, etc.) have.

Fig. 21 shows the reflectance K _r and the maximum flow velocity Vmax passing between aberrations when l / l '= 0.45, 0.68, and 0.91 under the condition of the step length l' = 0.44 (constant). In the same figure, it was confirmed that the minimum value of K _r tends to decrease as l / l 'increases, that is, as the installation position of the aberration column is moved toward the sea side of step 11A. Therefore, it has been found that, from the viewpoint of the sofa, it is preferable to arrange the aberration column near the sea side edge of the step 11A.

22A and 22B show the primary conversion efficiency E in the case of I / I '= 0.91 and 0.45, respectively. In the same figure, it was confirmed that the maximum value of the primary conversion efficiency E tends to increase as l / l 'increases, that is, as the installation position of the aberration column is shifted toward the sea side of the step 11A. Therefore, from the viewpoint of power generation efficiency, it was found that it is preferable to arrange the aberration column in the vicinity of the sea side edge of step 11A.

1, 101, 201, 301 wave power generation system
2 aberration column (rotating body heat)
3 generator
10 opaque wall
11, 11A, 11B groundsill (step)
12 Cover (upper wall)
20, 120 aberration (rotating body)
120A first aberration
120B second aberration
21, 121,
118 Inflow area
119 Outflow area
150, 250, 350 The first rectifying member
160, 260, 360 The second rectifying member

Claims (12)

And is used together with a breakwater having a non-permeable front wall on the sea side of the non-permeable wall to dissipate the energy of the wave, In a wave power generation system for generating electricity from the energy of blue,
A rotary body heat of a plurality of rotors arranged on the sea side of the opaque wall in planar view along the extending direction of the opaque wall,
And a generator that converts rotational energy of the plurality of rotating bodies into electric power. The wave power generation system according to claim 1, wherein the adjacent rotating bodies included in the rotating body heat are configured to rotate in opposite directions. The rotating body according to any one of claims 1 and 2, wherein between the rotating shafts of the adjacent rotating bodies included in the rotating body heat, an inflow region through which the wave flowing from the sea side to the impermeable wall side passes or an inflow region through which the wave flows from the impermeable wall side to the sea side It becomes an outflow area through which the waves pass,
Wherein at least one of the inflow region and the outflow region is formed,
A first rectifying member which is disposed in the vicinity of the sea side of the outflow region and guides wave to the inflow region from the sea side toward the opaque wall side,
And a second rectifying member disposed in the vicinity of the opaque wall side of the inflow region and guiding wave to the inflow region from the opaque wall side to the sea side. The wave power generation system according to claim 3, wherein the rotating body included in the rotating body column is arranged at a position corresponding to the inflow region and a position corresponding to the outflow region at different intervals. The wave power generation system according to any one of claims 1 to 4, wherein the rotating bodies included in the rotating body heat are arranged at unequal intervals. The wave power generation system according to any one of claims 1 to 5, further comprising an upper wall portion supporting the rotating body, the lower wall portion extending horizontally from the opaque wall. The wave generation system according to any one of claims 1 to 5, further comprising a caisson having the opaque wall and a bottom and a top wall extending from the bottom and top of the opaque wall to the sea side, respectively. The wave generation system according to any one of claims 1 to 7, further comprising a groundsill provided with the rotary body heat so that the depth of the installation point of the rotary body heat becomes shallower than the depth of the sea side point. The wave power generation system of claim 8, wherein the base has a vertical surface facing the sea side. The wave power generation system according to any one of claims 1 to 9, wherein the rotating body is an aber of rotation in a constant direction without depending on the wave direction. The method of claim 10,
Wherein the rotating body is a Savonius water turbine. The wave power generation system according to any one of claims 1 to 11, wherein the rotary shaft of the rotating body extends in a vertical direction.

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