JP4045233B2 - Fin equipment - Google Patents

Description

  The present invention relates to a composite wing-type fin device that is mounted at a height position of a propeller shaft at a front edge portion of a rudder located behind a propeller in order to save fuel consumption during ship operation.

Examples of conventional techniques include those shown in Japanese Patent No. 3004238 of Patent Literature 1 and Japanese Patent No. 2837948 of Patent Literature 2.
That is, in Patent Document 1, a technique related to a propulsion performance improving device configured by a small valve having a fin having a blade cross-section on a rudder behind a propeller and a bowl-shaped tip having a flat portion, and Patent Document 2, The present invention relates to a marine rudder having fins extending laterally from both sides of a rudder, and having a substantially hemispherical front portion so as to be close to a propeller boss cap at a fin mounting position at a front edge of the rudder. Technology is disclosed.

  Further, as another conventional technique, Japanese Patent Application Laid-Open No. 2001-138986 of Patent Document 3 discloses that a wing tip is located on the left and right side of the front of the propeller with respect to the hull form in which the bilge vortex center is below the propeller center axis in the vicinity of the propeller position. A technique has been disclosed that includes a fin with a rudder that is positioned approximately at the center of the bilge vortex and has one fin each having a downward camber and that extends laterally from both sides of the rudder.

Japanese Patent No. 3004238 Japanese Patent No. 2837948 JP 2001-138986 A

  However, in such a conventional technique, in Patent Document 1, the small valve shape of the bowl-shaped tip portion having a flat portion has a complicated structure and is difficult to make, and the fins protruding from the rudder side surface are large and have a large angle. There is a problem that there is a risk of contact with the propeller when steering. Further, in Patent Document 2, there is a problem that the structure is complicated and expensive due to the shape of the protrusion having a substantially hemispherical surface and the configuration of fins extending on the side surface of the rudder.

  Moreover, in patent document 3, it is made to cooperate with the fin provided in the hull itself, and the fin provided in the rudder. The construction of the fin provided in the hull is very expensive, and the rudder always operates. However, the relative relationship between the fins has changed, and there is a problem that it is difficult to expect an efficient operation.

  The present invention has been made paying attention to such problems of the conventional technology, and can be handled only by the construction on the rudder side, and the fin can be operated simply and efficiently. The object is to provide a device.

The gist of the present invention for achieving the object lies in the inventions of the following items.
[1] A composite wing-type fin device mounted at the height of the propeller shaft at the front edge of the rudder (1) located behind the propeller in order to save fuel consumption during ship operation,
A bilaterally symmetrical two-dimensional airfoil fin (20) provided from the front edge to the side of the rudder (1) and forming a central core portion;
A pair of asymmetric airfoil fins (50) extending so as to be joined to the vertical surfaces (25) at both ends of the two-dimensional airfoil fin (20) on the left and right sides;
It is comprised by this fin apparatus characterized by the above-mentioned.

[2] A composite wing-type fin device mounted at the height of the propeller shaft at the front edge of the rudder (1) located behind the propeller in order to reduce fuel consumption during ship operation,
A bilaterally symmetric two-dimensional airfoil fin (20) provided from the front edge to the side of the rudder (1) and forming a central core portion, and vertical surfaces of both ends of the two-dimensional airfoil fin (20) (25) and a pair of asymmetric airfoil fins (50) extended to be joined on the left and right side,
The longitudinal cross-sectional shape of the left-right symmetrical two-dimensional wing-shaped fin (20) forming the central core portion is such that the tip (21) is formed in a horizontal semi-cylindrical shape and the wing on the side of the rudder (1) is rearward. A fin device characterized by a water droplet type shape that is squeezed entirely toward the edge and tied with a smooth curve.

[3] A composite wing-type fin device mounted at the height of the propeller shaft at the front edge of the rudder (1) located behind the propeller in order to save fuel consumption during ship operation,
A bilaterally symmetric two-dimensional airfoil fin (20) provided from the front edge to the side of the rudder (1) and forming a central core portion, and vertical surfaces of both ends of the two-dimensional airfoil fin (20) (25) and a pair of asymmetric airfoil fins (50) extended to be joined on the left and right side,
The pair of left and right asymmetrical wing fins (50) is joined with a mounting angle of attack in a blade cross-sectional shape that fits within the vertical surfaces (25) at both ends of the left and right wings of the two-dimensional wing fin (20), and propeller rotation In the case of the right rotation, the fin apparatus is characterized in that the starboard wing has a pressure surface as an upper surface and the port wing has a pressure surface as a lower surface.

[4] A composite wing-type fin device mounted at the height of the propeller shaft at the front edge of the rudder (1) located behind the propeller in order to save fuel consumption during ship operation,
A bilaterally symmetric two-dimensional airfoil fin (20) provided from the front edge to the side of the rudder (1) and forming a central core portion, and vertical surfaces of both ends of the two-dimensional airfoil fin (20) (25) and a pair of asymmetric airfoil fins (50) extended to be joined on the left and right side,
The longitudinal cross-sectional shape of the left-right symmetrical two-dimensional wing-shaped fin (20) forming the central core portion is such that the tip (21) is formed in a horizontal semi-cylindrical shape and the wing on the side of the rudder (1) is rearward. A water drop shape that is narrowed down toward the edge and tied with a smooth curve,
The pair of left and right asymmetrical wing fins (50) is joined with a mounting angle of attack in a blade cross-sectional shape that fits within the vertical surfaces (25) at both ends of the left and right wings of the two-dimensional wing fin (20), and propeller rotation In the case of the right rotation, the fin apparatus is characterized in that the starboard wing has a pressure surface as an upper surface and the port wing has a pressure surface as a lower surface.

  [5] In the two-dimensional airfoil fin, the maximum diameter of the arc shape of the tip semicircle is about 0.16 to 0.18 times the propeller diameter, and the maximum width is 0.18 to 0.20 times the propeller diameter. The blade has a larger value than the maximum thickness of the rudder (1), which is the mounted part, the blade maximum chord length is about 0.4 times the propeller diameter, the blade leading edge receding angle is 0 degrees, and the mounting angle of attack is the propeller. Item 1 is characterized in that the blade leading edge protrudes from the front end of the rudder (1) parallel to the axial center height position, and the distance from the propeller boss cap is about 100 mm to 200 mm in actual ship dimensions. , 2, 3 or 4.

  That is, in order to solve the above problems, the present invention proposes a composite wing fin device based on a new idea. The basic structure is a two-dimensional wing-shaped fin (20) that is symmetrical to the left and right with an optimal blade longitudinal cross-sectional shape that works effectively for the wake gain effect of low-speed ships to medium-speed ships and high-speed ships. In addition, in order to improve the thrust reduction coefficient that contributes most to the improvement of propulsion efficiency, a pair of left and right asymmetric wing fins (50) having an optimum blade cross-sectional shape and an optimum mounting angle of attack are adopted as side portions, and combined The aim is to improve propulsion performance.

  Based on the results of a water tank test of a conventional energy-saving device with a small valve shape, the optimum blade longitudinal cross-sectional shape that forms the central core portion is one of the important parameters that influence the wake gain effect. Paying attention to the maximum cross-sectional area of the small valve that forms the part, even if the core shape forming the central part is different from the conventional small valve shape, the maximum cross-sectional area that the shape has is the same as the conventional optimum maximum cross-sectional area It was found that the same wake gain effect can be expected.

  Based on this conclusion, a two-dimensional airfoil fin (20) having a symmetrical shape was proposed as the shape of the central core portion. The longitudinal cross-sectional shape that is the greatest feature of the two-dimensional wing fin (20) is that the tip (21) of the wing is formed in a semicircular arc shape, and the whole is narrowed toward the trailing edge of the wing to be smooth. It is a water drop shape connected by a curve. In addition, the maximum width of the wings projecting from the center line of the rudder (1) to the left and right side is a value slightly larger than the maximum thickness of the rudder (1) of the mounting portion.

  With such a two-dimensional airfoil fin (20), the maximum cross-sectional shape is a quadrangle, and when designed with the same dimensions, it is possible to have a maximum cross-sectional area that is larger than the maximum cross-sectional area of the arc of the small valve shape of the United States. It works advantageously from the viewpoint of the wake gain effect. Specifically, the shape of the two-dimensional airfoil fin (20) that is optimal for a low-speed ship to a medium-speed ship and a high-speed ship is shown. The maximum diameter of the semicircular arc shape at the blade tip (21) is about 0 of the propeller diameter. .16 to about 0.18 times, the maximum width of the wings extending from the rudder (1) to the left and right side of the rudder is about 0.18 to about 0.20 times the propeller diameter, and the maximum thickness of the rudder (1) It is something larger than that.

  Next, for the wing-shaped fins on the side parts that protrude from the left and right sides, the optimal blade cross-section shape and low-speed to medium-speed ship aim to improve the thrust reduction coefficient by efficiently recovering the rotational energy of the propeller wake. And a pair of left and right asymmetric wing fins (50) with an optimum angle of attack for high speed ships was proposed. Specifically, the maximum width of the wings projecting from the rudder (1) center line to the left and right sides is about 0.35 times the propeller diameter, and the maximum chord length at the rudder (1) center line is the two-dimensional wing fin ( 20) The same as the maximum chord length of the wing, and the retraction angle of the wing leading edge is about 35 degrees for optimization.

  Regarding the blade cross-sectional shape and mounting angle of attack, when the propeller rotation is right rotation, the starboard wing has the pressure surface as the top surface, and the mounting angle of attack is 0 to -4 degrees for low speed ships with the wing trailing edge as the base point. For ships and high-speed ships, it is 0 to +4 degrees. For port wings, the pressure surface is the lower surface, and the angle of attack for installation is 0 to -4 degrees from low speed ships to medium speed ships and high speed ships with the trailing edge of the wing as the base point.

  It should be noted that the blade cross-sectional shape and the mounting angle of attack are all set to the shape of the left and right end portions of the two-dimensional airfoil fin (20). Also, a new idea has been made for the method of joining the left and right asymmetric wing fins (50). That is, the maximum blade width of the two-dimensional airfoil fin (20) forming the core portion is made larger than the maximum thickness of the rudder (1) at the mounting position, and the left and right heel ends of the two-dimensional airfoil fin (20) By securing a flat vertical surface (25), the left and right asymmetric wing fins (50) are joined here. Unlike joining to complicated curved surfaces, highly precise joining is possible with little effort.

The present invention operates as follows.
The fin device according to the present invention has a composite wing shape, and is mounted at the height of the propeller shaft at the front edge portion of the rudder (1) located behind the propeller, thereby reducing fuel consumption during ship operation. In other words, the fin device receives the wake of the propeller by the two-dimensional airfoil fin at the tip (21) and flows it to the subsequent asymmetric airfoil fin, thereby collecting it as thrust and saving energy.

  Since the two-dimensional airfoil fin (20) is provided from the front edge to the side of the rudder (1) and has a two-dimensional shape that is symmetrical to the left and right sides, it does not cost much to make the shape. In particular, the longitudinal cross-sectional shape is a waterdrop type shape in which the tip (21) is formed in a horizontal semi-cylindrical shape, and the whole is squeezed toward the trailing edge of the wing on the side of the rudder (1) and tied with a smooth curve, We are trying to reduce resistance.

  The pair of asymmetric airfoil fins (50) are extended so as to be joined to the vertical surfaces (25) of both ends of the two-dimensional airfoil fin (20) on the left and right sides, so that the shape of the rudder (1) is related. Instead, it becomes a planar connection. In addition, the cross-sectional shape of the blade that fits within the vertical planes (25) at both the left and right ends of the two-dimensional airfoil fin (20) is joined with a mounting angle of attack and is within the range of the two-dimensional airfoil fin. There is no fear of it.

  The pair of left and right asymmetric wing-type fins (50), when propeller rotation is right rotation, the starboard wing has the pressure surface as the upper surface, the port wing has the pressure surface as the lower surface, and the rotational energy of the wake of the propeller Collect efficiently.

  According to the fin device of the present invention, since the asymmetrical fin is joined to the two-dimensional wing fin, the structure is simple and the shape is simple. Manufacturing is also possible, and it is possible to provide an energy-saving fin device with excellent performance without extra cost.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.
1 to 4 show an embodiment of the present invention.
The fin device 10 has a composite wing shape that is mounted at the height position 2 of the propeller shaft at the front edge of the rudder 1 located behind the propeller in order to reduce fuel consumption during ship operation. The two-dimensional airfoil fins 20 that are provided from the front edge part to the side part and that form the central core part and are symmetrically extended to the vertical surfaces 25 at both ends of the two-dimensional airfoil fins 20 are extended. And a pair of asymmetric airfoil fins 50.

  The vertical cross-sectional shape of the two-dimensional wing-shaped fin 20 that is symmetrical to the left and right sides forming the central core portion is such that the tip portion 21 is formed in a horizontal semi-cylindrical shape, and the whole is narrowed toward the trailing edge of the wing on the side portion of the rudder 1. It is formed in a water droplet shape connected with a smooth curve. Both end surfaces of the two-dimensional airfoil fin 20 form a vertical surface 25.

  The two-dimensional airfoil fin 20 having a symmetrical shape that is the central core portion is slightly larger than the maximum thickness of the rudder 1, has a maximum blade width 26 projecting from the left and right reeds, and protrudes from the front edge of the rudder 1. As shown by a broken line in FIG. 1, the end portions of the left and right end portions of the two-dimensional airfoil fin 20 are cut obliquely toward the center within a range that does not affect the maximum cross-sectional area. May be. This is intended to reduce the induction resistance of the two-dimensional airfoil fin 20 as much as possible.

  The pair of left and right asymmetric wing fins 50 projecting from the two-dimensional wing fins 20 on both sides is a blade cross-sectional shape that fits within the vertical surfaces 25 at both left and right wing end portions of the two-dimensional wing fins 20 and an optimum mounting reception. Joined at the corner. When the propeller rotation is a right rotation, the pressure surface is the upper surface of the starboard wing, and the pressure surface is the lower surface of the port wing. When the propeller rotation is counterclockwise, the reverse is true.

  More specifically, in the two-dimensional airfoil fin 20, the maximum diameter 22 of the semicircular arc shape of the tip 21 is about 0.16 to 0.18 times the diameter of the propeller, and the blades that protrude from the left and right side are the largest. Large 26 is about 0.18 to 0.20 times the diameter of the propeller, and is a value larger than the maximum thickness 2 of the rudder 1 which is the mounted portion.

  The maximum chord length 24 of the two-dimensional airfoil fin 20 is about 0.4 times the propeller diameter, the receding angle of the blade leading edge is 0 degree, the mounting angle of attack is 0 degree parallel to the height of the propeller axis, and the front of the blade The edge 21 protrudes from the front end of the rudder 1 and the distance 6 from the propeller boss cap 5 is about 100 to 200 millimeters in actual ship dimensions.

  Further, when the propeller rotation is right rotation, the asymmetric wing fin 50 has a pressure surface on the starboard wing and an attachment angle of attack 51 based on the wing trailing edge. For speedboats and high-speed ships, the angle is 0 to +4 degrees, for port wings, the pressure surface is the bottom surface, and the mounting angle of attack is from 0 degrees to -4 degrees from low-speed ships to medium-speed ships and high-speed ships based on the trailing edge of the wings. The maximum blade width 52 extending from the rudder 1 center line to the left and right side is about 0.35 times the propeller diameter, the maximum chord length on the rudder 1 center line is about 0.4 times the propeller diameter, and the blade leading edge retraction angle 53 Is formed at about 35 degrees.

Next, the operation will be described.
The fin device 10 has a composite wing shape, and is mounted at the height of the propeller shaft at the front edge of the rudder 1 located behind the propeller to save fuel consumption during ship operation. That is, the fin device 10 receives the wake of the propeller by the two-dimensional airfoil fin 20 at the tip and flows it to the subsequent asymmetric airfoil fin 50 to collect it as thrust, thereby saving energy.

  Since the two-dimensional airfoil fin 20 is provided from the front edge portion to the side portion of the rudder 1 and has a two-dimensional shape that is symmetrical to the left and right sides, it does not cost much to make the shape. In particular, the vertical cross-sectional shape is a waterdrop type shape with the tip part formed in a horizontal semi-cylindrical shape and squeezed entirely toward the trailing edge of the wing on the side of the rudder 1 and connected with a smooth curve to reduce resistance. Yes.

  The pair of asymmetric airfoil fins 50 are extended so as to be joined to the vertical surfaces 25 at both ends of the two-dimensional airfoil fins 20 on the left and right sides, so that they are joined in a planar manner regardless of the shape of the rudder 1. . Further, since the blade cross-sectional shape fits within the vertical planes 25 at both the left and right end portions of the two-dimensional airfoil fin 20 and is joined with the mounting angle of attack, and is within the range of the two-dimensional airfoil fin 20, it is compact and may cause interference. Absent.

  Also, when the propeller rotation is right rotation, the pair of left and right asymmetric wing fins 50 has the pressure surface as the upper surface of the starboard wing and the pressure surface as the lower surface of the port wing, and efficiently uses the rotational energy of the propeller wake. to recover.

  According to a tank test conducted on a large-scale low-speed ship, the energy saving effect (horsepower saving effect) of the composite wing fin device according to the present invention is about 5.2% at full load full output and about at ballast normal output. It was 3.5%. The comparison of the water tank test results is shown below. In addition, the tank test will be continued in the future when this device is installed on medium-speed ships and high-speed ships.

<Results of tank test for large low-speed ship>
・ Full load (Fn = 0.15)
-Propulsion efficiency of 0.713 (BHP = 16,499 kW) without this device
・ Propulsion efficiency 0.752 (BHP = 15,639kw)
Horsepower saving effect 5.2%
・ Ballast state (Fn = 0.16)
・ Propulsion efficiency 0.759 (BHP = 17,616kw) without this device
・ Propulsion efficiency 0.786 (BHP = 16,991 kW) with this equipment equipped
Horsepower saving effect 3.5%

It is a perspective view which shows the fin apparatus which concerns on one embodiment of this invention. It is a top view which shows the fin apparatus which concerns on one embodiment of this invention. It is a front view which shows the fin apparatus which concerns on one embodiment of this invention. It is a longitudinal cross-sectional view of the fin apparatus which concerns on one embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Rudder 10 ... Fin apparatus 20 ... Two-dimensional airfoil fin 21 ... Tip part 25 ... Vertical surface 50 ... Asymmetric airfoil fin

Claims (5)

In order to save fuel consumption during ship operation, it is a composite wing type fin device mounted at the height of the propeller shaft at the front edge of the rudder located behind the propeller,
A bilaterally symmetric two-dimensional airfoil fin provided from the front edge to the side of the rudder and forming a central core portion;
A pair of asymmetric airfoil fins extending so as to be joined to the vertical surfaces of both ends of the two-dimensional airfoil fins on the left and right sides;
It is comprised by this fin apparatus characterized by the above-mentioned. In order to save fuel consumption during ship operation, it is a composite wing type fin device mounted at the height of the propeller shaft at the front edge of the rudder located behind the propeller,
A bilaterally symmetric two-dimensional airfoil fin that is provided from the front edge to the side of the rudder and forms a central core portion, and extends so as to be joined to the vertical surfaces of both ends of the two-dimensional airfoil fin on the left and right side. A pair of asymmetric wing fins,
The vertical cross-sectional shape of the bilaterally symmetric two-dimensional wing-shaped fin forming the central core portion is formed with a semi-cylindrical tip at the tip and smoothed down to the trailing edge of the wing on the side of the rudder. A fin device characterized in that it has a water drop shape connected by a simple curve. In order to save fuel consumption during ship operation, it is a composite wing type fin device mounted at the height of the propeller shaft at the front edge of the rudder located behind the propeller,
A bilaterally symmetric two-dimensional airfoil fin that is provided from the front edge to the side of the rudder and forms a central core portion, and extends so as to be joined to the vertical surfaces of both ends of the two-dimensional airfoil fin on the left and right side. A pair of asymmetric wing fins,
The pair of left and right asymmetrical wing fins are joined with a mounting angle of attack with a blade cross-sectional shape that fits within the vertical planes at both ends of the two-dimensional wing fins of the two-dimensional wing fin. The fin device is characterized in that the pressure surface is the upper surface of the wing and the pressure surface is the lower surface of the port wing. In order to save fuel consumption during ship operation, it is a composite wing type fin device mounted at the height of the propeller shaft at the front edge of the rudder located behind the propeller,
A bilaterally symmetric two-dimensional airfoil fin that is provided from the front edge to the side of the rudder and forms a central core portion, and extends so as to be joined to the vertical surfaces of both ends of the two-dimensional airfoil fin on the left and right side. A pair of asymmetric wing fins,
The vertical cross-sectional shape of the bilaterally symmetric two-dimensional wing-shaped fin forming the central core portion is formed with a semi-cylindrical tip at the tip and smoothed down to the trailing edge of the wing on the side of the rudder. A water drop shape connected by a simple curve,
The pair of left and right asymmetrical wing fins are joined with a mounting angle of attack with a blade cross-sectional shape that fits within the vertical planes at both ends of the two-dimensional wing fins of the two-dimensional wing fin. The fin device is characterized in that the pressure surface is the upper surface of the wing and the pressure surface is the lower surface of the port wing.   The maximum diameter of the arc shape of the tip semicircle is about 0.16 to 0.18 times the propeller diameter, and the maximum width is about 0.18 to 0.20 times the propeller diameter. It is a value larger than the maximum thickness of the rudder, which is the mounted part, the maximum blade chord length is about 0.4 times the propeller diameter, the blade leading edge receding angle is 0 degree, and the installation angle of attack is at the propeller shaft center height position The parallel 0 degree, the wing leading edge protrudes from the rudder front end, and the distance from the propeller boss cap is about 100 to 200 millimeters in actual ship dimensions. Fin device.

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