CN112253391B

CN112253391B - Air flow control device, fan blade comprising same and wind generating set

Info

Publication number: CN112253391B
Application number: CN202011196320.0A
Authority: CN
Inventors: 赵越; 艾国远; 李海涛; 赵大文
Original assignee: Shanghai Electric Wind Power Group Co Ltd
Current assignee: Shanghai Electric Wind Power Group Co Ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2022-02-01
Anticipated expiration: 2040-10-30
Also published as: CN112253391A

Abstract

The invention discloses an air flow control device, a fan blade comprising the same and a wind generating set, wherein the air flow control device comprises at least one control unit, the control unit comprises two vertical plates and an exhaust assembly, the vertical plates are oppositely arranged, the distance between the two vertical plates is gradually increased from front to back, the exhaust assembly is provided with an exhaust hole capable of ejecting gas, and the exhaust hole is arranged in the rear side area between the two vertical plates. The air flow control device of the invention mixes the external energy of the boundary layer of the fan blade into the interior of the boundary layer by enabling the air flow flowing through the surface of the fan blade to flow through the area between the two vertical plates to generate vortex, increases the internal energy of the boundary layer, and then drives the vortex center of the vortex to move downwards through the air flow sprayed out of the exhaust hole of the exhaust assembly, thereby enhancing the energy mixing of the boundary layer, further increasing the internal energy of the boundary layer and improving the anti-separation capability of the boundary layer.

Description

Air flow control device, fan blade comprising same and wind generating set

Technical Field

The invention relates to the field of wind power generation, in particular to an air flow control device, a fan blade comprising the same and a wind generating set.

Background

When the wind generating set operates, if the attack angle of the blade is too large, the blade can generate a boundary layer flow separation phenomenon called as blade stall, the lift force of the blade can be rapidly reduced due to the flow separation, the resistance can be rapidly increased, the aerodynamic performance of the blade can be reduced, and the power generation amount loss is serious. With the maximization of wind power blades, the requirements on the blade structure are higher and higher, and the airfoil profile with large thickness and blunt trailing edge becomes the first choice of the airfoil profile at the end of the blade root. In the operation process of the wind turbine generator, boundary layer flow separation is easy to occur in a blade root area using a large-thickness airfoil, and then three-dimensional flow along the span direction of the blade is generated, so that the aerodynamic performance of the blade is reduced.

In order to obtain higher wind energy utilization rate during the normal operation of the wind turbine, the lift force of the blades needs to be improved, and simultaneously the resistance of the blades needs to be reduced. The detached flow area is typically reduced by increasing the blade attached flow area by moving the detached flow location toward the trailing edge of the blade by some flow control means. For example, chinese patent No. CN201110452836 discloses an active flow control system and method for operating a boundary layer of air crossing a wind turbine rotor blade, which opens air holes between a leading edge and a maximum thickness and between a trailing edge and the maximum thickness of a wind turbine blade, the air holes are connected with an exhaust pipe inside a blade cavity, and flow control is performed on the boundary layer by air hole suction or exhaust, so as to achieve the purpose of improving the aerodynamic performance of the blade. However, the holes are formed on the surface of the blade, so that the blade structure is damaged, and the hole forming direction of the surface of the blade is vertical to the surface of the blade, so that the speed direction of the discharged airflow is close to the direction of the incoming flow of the front edge of the blade, and the speed direction of the synthesized airflow forms a certain included angle with the surface of the blade, which is not beneficial to inhibiting flow separation.

Disclosure of Invention

The invention aims to overcome the defect that boundary layer flow separation occurs in a wind power blade when a wind generating set in the prior art runs, and provides an air flow control device, a fan blade comprising the same and the wind generating set.

The invention solves the technical problems through the following technical scheme:

the air flow control device comprises at least one control unit, wherein the control unit comprises two vertical plates and an exhaust assembly, the vertical plates are arranged oppositely, the distance between the two vertical plates is gradually increased from front to back, the exhaust assembly is provided with an exhaust hole capable of ejecting air, and the exhaust hole is arranged in the rear side area between the two vertical plates.

In the scheme, the air flow control device generates vortex flow by enabling the air flow flowing through the surface of the fan blade to flow through the area between the two vertical plates, the external energy of the boundary layer of the fan blade is mixed into the boundary layer, the internal energy of the boundary layer is increased, and then the vortex center of the vortex flow is driven to move downwards by the air flow sprayed out of the exhaust hole of the exhaust assembly, so that the energy mixing of the boundary layer is enhanced, the internal energy of the boundary layer is further increased, and the anti-separation capability of the boundary layer is improved.

Preferably, the exhaust assembly comprises an air supply mechanism, and an air outlet of the air supply mechanism is communicated with the exhaust hole.

In the scheme, the air supply mechanism supplies air into the exhaust hole of the exhaust assembly, so that the exhaust flow can be adjusted according to the running state of the wind driven generator, and the vortex center of the vortex can be better reduced by the air sprayed from the exhaust hole.

Preferably, the exhaust assembly further comprises an exhaust plate, and the exhaust hole is formed in the upper surface of the exhaust plate.

In this scheme, establish the exhaust hole on the air discharge plate, avoid direct trompil on fan blade to cause blade structure to harm, also convenient the setting position to the exhaust hole is adjusted simultaneously.

Preferably, an air inlet channel is arranged in the exhaust plate, the air inlet channel is communicated with the exhaust hole, and an air outlet of the air supply mechanism is communicated with the air inlet channel.

In this scheme, set up the inlet channel with the exhaust hole intercommunication, be convenient for be connected with the air outlet of mechanism of supplying gas.

Preferably, the thickness of the exhaust plate is gradually reduced from front to back, and the exhaust hole is arranged near the front end of the exhaust plate.

In this scheme, the thickness of exhaust plate reduces from the past backward gradually, can reduce the resistance through exhaust plate surface wind current, still conveniently makes the opening in exhaust hole towards the flow direction of the air through fan blade surface simultaneously to be consistent with the incoming flow velocity direction of exhaust hole blowout gas's air current direction and air, make the synthetic velocity direction laminating fan blade's of air current surface, be favorable to restraining the air flow separation of boundary layer. The exhaust hole is arranged close to the front end of the exhaust plate, so that the vortex center of the vortex can be quickly reduced by the airflow sprayed from the exhaust hole.

Preferably, the air flow control device further comprises a bottom plate, and the two vertical plates are both mounted on the bottom plate.

In this scheme, adopt above-mentioned structural style, simple structure, it is fixed that the convenience is installed the riser.

Preferably, the thickness of the bottom plate gradually increases from the front end of the vertical plate to the rear end of the vertical plate.

In the scheme, the flow resistance of the front end of the bottom plate to wind can be reduced by adopting the structural form.

Preferably, a first channel and a first communicating port communicated with the first channel are arranged in the bottom plate, a second communicating port communicated with the exhaust hole is arranged on the exhaust plate, and the first communicating port and the second communicating port are correspondingly communicated.

In this scheme, through set up first passageway and the intercommunication mouth that communicates with the air discharge plate on the bottom plate, can carry the exhaust hole blowout with the gas of mechanism of supplying gas through first passageway.

Preferably, the first communication port, the second communication port and the exhaust hole are all provided in a plurality along a direction in which the first channel extends, and the number of the exhaust holes is the same as that of the second communication port.

In this scheme, increase the jet range of blowout gas through setting up a plurality of exhaust holes, be favorable to the air current to drive the vortex core of vortex and move down, and then strengthen the energy of boundary layer and mix, increase the internal energy of boundary layer, improve the anti-separation ability of boundary layer.

Preferably, the air flow control device has a plurality of the control units, a partition plate is arranged between adjacent control units, a second channel is arranged in the partition plate, and the first channels of adjacent control units are communicated with each other through the second channel.

In this aspect, the partition plate is provided so that the vortices generated in the adjacent vortex generation regions are not influenced by each other.

Preferably, the vertical plate is provided with an insert having a through hole, the vertical plate is installed between the bottom plate and the partition plate through the insert, one end of the insert is inserted into the first channel, the other end of the insert is inserted into the second channel, and the first channel and the second channel are communicated through the through hole.

In this scheme, adopt above-mentioned structure, be convenient for processing and equipment.

Preferably, the distance from one end of the bottom plate far away from the partition plate to one end of the partition plate far away from the bottom plate is the same as the length of the exhaust plate.

In this scheme, adopt above-mentioned structure, be convenient for form regular structure, do benefit to the installation.

Preferably, the height of the vertical plate is gradually increased from front to back.

In this case, the above structure is adopted to generate sufficient vortex flow to delay the flow separation of the air flow.

Preferably, the air flow control apparatus further comprises a controller for controlling the amount of gas ejected from the exhaust hole.

In the scheme, the exhaust flow of the exhaust hole can be adjusted according to the running state of the wind driven generator and the size and direction of external wind power, so that the vortex center of vortex can be better reduced by gas sprayed from the exhaust hole.

A fan blade comprising an air flow control device as described above.

In the scheme, the air flow control device is arranged on the fan blade, so that the energy exchange between the surface of the fan blade and the outside can be effectively improved, the utilization rate of wind energy of the wind driven generator set is improved, and the generating capacity is improved.

Preferably, the air flow control device is arranged on the windward side and/or the leeward side of the fan blade;

a first opening is formed between the front ends of the two vertical plates, a second opening is formed between the rear ends of the two vertical plates, the first opening faces the front edge of the fan blade, and the second opening faces the rear edge of the fan blade.

In this scheme, adopt above-mentioned structural mounting can obtain bigger vortex, be favorable to delaying the flow separation of air current.

Preferably, the air flow control device is disposed near a blade root of the fan blade.

In the scheme, the boundary layer flow separation is easily generated in the blade root area, so that the aerodynamic performance of the blade is reduced, and the air flow control device is arranged close to the blade root of the fan blade, so that the boundary layer flow separation generated in the blade root area can be delayed.

A wind park comprising a fan blade as described above.

On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.

The positive progress effects of the invention are as follows: the air flow control device of the invention mixes the external energy of the boundary layer of the fan blade into the interior of the boundary layer by enabling the air flow flowing through the surface of the fan blade to flow through the area between the two vertical plates to generate vortex, increases the internal energy of the boundary layer, and then drives the vortex center of the vortex to move downwards through the air flow sprayed out of the exhaust hole of the exhaust assembly, thereby enhancing the energy mixing of the boundary layer, further increasing the internal energy of the boundary layer and improving the anti-separation capability of the boundary layer.

Drawings

Fig. 1 is a schematic structural diagram of a control unit of an air flow control apparatus according to a preferred embodiment of the present invention.

FIG. 2 is a schematic structural diagram of a bottom plate according to a preferred embodiment of the present invention.

Fig. 3 is a schematic view of the internal structure of the base plate in the preferred embodiment of the invention.

FIG. 4 is a schematic view of an exhaust plate according to a preferred embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a vertical plate in a preferred embodiment of the invention.

Fig. 6 is a schematic structural diagram of a vertical plate in a preferred embodiment of the invention.

FIG. 7 is a schematic structural diagram of a spacer plate according to a preferred embodiment of the present invention.

Fig. 8 is a schematic view illustrating the installation of the vertical plate and the bottom plate in the preferred embodiment of the present invention.

FIG. 9 is a schematic view of the installation of the vertical plate, the bottom plate and the spacing plate in the preferred embodiment of the present invention.

FIG. 10 is a schematic structural view of a wind turbine generator set according to a preferred embodiment of the present invention.

FIGS. 11(a) -11(g) are schematic views illustrating the installation of an air flow control device in accordance with a preferred embodiment of the present invention.

Description of reference numerals:

control unit 100

First vertical plate 1

Second vertical plate 2

Exhaust plate 3

Projection 301

Second communication port 302

Exhaust vent 4

Base plate 5

First channel 501

First communication port 502

Partition plate 6

Second channel 601

Insert 7

Through hole 701

Air supply mechanism 8

Controller 9

Gas pipeline 10

Tower 11

Nacelle 12

Hub 13

Fan blade 14

First adhesive tape area 15

Second adhesive tape area 16

Detailed Description

The invention will be more clearly and completely described below by way of examples and with reference to the accompanying drawings, without thereby limiting the scope of the invention to these examples.

As shown in fig. 1 to 9, the air flow control device of the present embodiment includes at least one control unit 100, wherein the control unit 100 includes two opposite vertical plates, and an exhaust assembly, a distance between the two vertical plates gradually increases from front to back, the exhaust assembly has an exhaust hole 4 capable of injecting gas, and the exhaust hole 4 is disposed in a rear side region between the two vertical plates. When the exhaust holes 4 are arranged, the openings of the exhaust holes 4 face the air flowing direction passing through the area between the two vertical plates, so that the air flow direction of the air sprayed out of the exhaust holes 4 is consistent with the incoming flow speed direction of the air, the resultant speed direction of the air flow is attached to the surface of the fan blade 14, and the inhibition of the air flow separation of a boundary layer is facilitated.

The control unit 100 of the air flow control device mixes the external energy of the boundary layer of the fan blade 14 into the boundary layer by making the air flow flowing through the surface of the fan blade 14 flow through the area between the two vertical plates to generate vortex, increases the internal energy of the boundary layer, and then drives the vortex center of the vortex to move downwards through the air flow sprayed out of the exhaust hole 4 of the exhaust assembly, thereby enhancing the energy mixing of the boundary layer, further increasing the internal energy of the boundary layer and improving the anti-separation capability of the boundary layer.

A specific structure of the control unit 100 of the present embodiment is shown in fig. 1, and the control unit 100 includes a first vertical plate 1, a second vertical plate 2, a bottom plate 5, a partition plate 6, an exhaust plate 3, and an air supply mechanism 8 (the air supply mechanism 8 is not shown in fig. 1). Bottom plate 5 is connected the setting side by side with space bar 6, first riser 1 is fixed between bottom plate 5 and space bar 6, second riser 2 is fixed to be set up at bottom plate 5 opposite side for first riser 1, distance between first riser 1 and the second riser 2 increases from the past backward gradually, exhaust plate 3 establishes the rear side at bottom plate 5, exhaust hole 4 has been seted up to exhaust plate 3's upper surface, exhaust hole 4 is close to the rear side region between two risers, inlet channel has in the exhaust plate 3, inlet channel and exhaust hole 4 intercommunication, the gas outlet and the inlet channel intercommunication of mechanism 8 of supplying gas are to exhausting hole 4 and supply gas. The control unit 100 is composed of a plurality of different plate-like members, facilitating processing and installation. Establish exhaust hole 4 on air discharge plate 3, avoid directly trompil on fan blade 14 to cause blade structure damage, also conveniently adjust the position that sets up of exhaust hole 4 simultaneously.

The air supply mechanism 8 in this embodiment is an air pump, the air pump has a plurality of power levels, the air pump has different air discharge capacities under different power levels, and the air pump guides the air flow to the air inlet channel on the air discharge plate 3 through the air transmission pipeline 10 and then ejects the air flow through the air discharge hole 4.

Of course, in other embodiments, the bottom plate 5 and the exhaust plate 3 may not be provided, the first vertical plate 1 and the second vertical plate 2 may also be directly fixed on the surface of the fan blade 14, and the exhaust hole 4 may also be directly opened on the fan blade 14.

As shown in fig. 2 and 3, the bottom plate 5 of the present embodiment has a plate-shaped structure with a narrow front part and a wide rear part, the thickness of the bottom plate 5 in the width direction gradually increases from the front end to the rear end, and the upper surface of the bottom plate 5 is streamlined to reduce the flow resistance of the front end of the bottom plate 5 to the wind. A first passage 501 penetrating the bottom plate 5 in the longitudinal direction and four first communication ports 502 provided at intervals in the longitudinal direction of the first passage 501 are provided at the rear end of the bottom plate 5. The first channel 501 and the first communication port 502 of the bottom plate 5 are circular through holes, and the four first communication ports 502 are communicated with the first channel 501.

As shown in fig. 1 and 4, the thickness of the exhaust plate 3 is gradually reduced from the front end to the rear end. When the exhaust plate 3 and the bottom plate 5 are mounted in a butt joint manner, the side view outline of the main body of the exhaust plate 3 and the side view outline of the main body of the bottom plate 5 are axisymmetric with respect to the vertical side where the two are in butt joint, namely, the upper surface of the exhaust plate 3 is also streamline. The front end side of the exhaust plate 3 is provided with four protrusions 301 arranged at intervals along the length direction of the exhaust plate 3, each protrusion 301 is provided with a second communication port 302, and the second communication ports 302 are communicated with the exhaust holes 4 in a one-to-one correspondence manner. When the bottom plate 5 is butted with the exhaust plate 3, each protrusion 301 is correspondingly inserted into the first communication hole 502 of the bottom plate 5. The outer diameter of the protrusion 301 is the same as the inner diameter of the first communication port 502 of the bottom plate 5 at the front end thereof, and the inner diameter of the second communication port 302 in the protrusion 301 is the same as the inner diameter of the air hole at the rear end of the first communication port 502. With the above structure, the air flow entering the first channel 501 of the bottom plate 5 enters the exhaust plate 3 through the four first communication holes 502, and is then ejected through the exhaust holes 4.

The thickness of the exhaust plate 3 in this embodiment is gradually reduced from the front to the back, so that the resistance to the wind flow passing through the surface of the exhaust plate 3 can be reduced, and the opening of the exhaust hole 4 is convenient to face the flow direction of the air passing through the surface of the fan blade 14, so that the airflow direction of the air ejected from the exhaust hole 4 is consistent with the incoming flow velocity direction of the air, the resultant velocity direction of the airflow is attached to the surface of the fan blade 14, and the inhibition of the airflow separation of the boundary layer is facilitated. The exhaust hole 4 is arranged close to the front end of the exhaust plate 3, so that the vortex center of the vortex can be quickly reduced by the airflow sprayed by the exhaust hole 4.

In other embodiments, the upper surfaces of the bottom plate 5 and the exhaust plate 3 may be only flat, or the thicknesses of the bottom plate 5 and the exhaust plate 3 may be the same from the front end to the rear end.

In this embodiment, the plurality of exhaust holes 4 are arranged to increase the jet range of the ejected gas, which is beneficial for the airflow to drive the vortex core of the vortex to move downwards, so as to enhance the energy mixing of the boundary layer, increase the internal energy of the boundary layer, and improve the anti-separation capability of the boundary layer.

As shown in fig. 1 and 7, the control unit 100 further includes a partition plate 6, and the side outline of the body of the partition plate 6 is identical to the side outline of the body of the bottom plate 5. A second passage 601 penetrating the partition 6 in the longitudinal direction is also provided at the rear end of the partition 6, and the second passage 601 is a circular through hole having the same inner diameter of the air hole as that of the first passage 501. When the bottom plate 5 and the partition plate 6 are correspondingly installed along the length direction, the first channel 501 and the second channel 601 are correspondingly communicated.

The purpose of the partition plate 6 is mainly to separate adjacent eddy current generation regions by a distance when a plurality of control units 100 are assembled, so that eddy currents generated in the respective eddy current generation regions are not influenced by each other.

In other embodiments, the partition plates 6 may not be provided, and the bottom plates 5 may be arranged at intervals, and the first passages 501 of different bottom plates 5 may be communicated through pipes.

As shown in fig. 5 and 6, the first vertical plate 1 and the second vertical plate 2 in this embodiment are both triangular plate-shaped structures, the structures and the sizes of the two vertical plates are the same, and the heights of the two vertical plates gradually increase from front to back. The above structure is adopted in order to generate enough vortex to delay the flow separation of the air flow.

In other embodiments, the first vertical plate 1 and the second vertical plate 2 can also be trapezoidal plates or other special-shaped plates with low front and high back.

Alternatively, in other embodiments, the heights of the front and rear ends of the first vertical plate 1 and the second vertical plate 2 may be the same.

Referring again to fig. 5, first vertical plate 1 and second vertical plate 2 are each provided with an insert 7 having a through hole 701. As shown in fig. 8 and 9, first vertical plate 1 and second vertical plate 2 are installed between bottom plate 5 and partition plate 6 through insert 7, one end of insert 7 is inserted into first channel 501, the other end of insert 7 is inserted into second channel 601, and first channel 501 and second channel 601 are communicated through hole 701. The outer diameters of both ends of the insert 7 are the same as the mounting inner diameters of the first and

second passages

501 and 601, respectively, and the inner diameters of the through-holes 701 are the same as the air hole inner diameters of the first and

second passages

501 and 601.

After the control unit 100 is assembled, the distance from the end of the bottom plate 5 far away from the partition plate 6 to the end of the partition plate 6 far away from the bottom plate 5 is the same as the length of the exhaust plate 3. That is, the sum of the length of the bottom plate 5, the length of the partition plate 6, and the thickness of one of the vertical plates is equal to the length of the exhaust plate 3. By adopting the structure, a regular structure is convenient to form, and the processing and the assembly are convenient.

In other embodiments, the two vertical plates of each control unit 100 can also be fixed on the upper surface of the bottom plate 5, and the bottom plate 5 and the spacing plate 6 are directly connected. Alternatively, the bottom plate 5 and the partition plate 6 are of one integral structure. Alternatively, the bottom plate 5, the partition plate 6 and the exhaust plate 3 may be formed as a single plate-like structure. In this embodiment, adopt a plurality of components of a whole that can function independently platelike structure, the purpose is for convenient processing, is convenient for set up gas passage in the inboard, also makes things convenient for later stage installation and transportation simultaneously.

Of course, in other embodiments, the bottom plate 5 and the partition plate 6 may be formed as a single structure, and the exhaust plate 3 may be divided into a plurality of combined plates so as to open the gas channel inside the exhaust plate 3.

In this embodiment, the air flow control device further includes a controller 9, and the controller 9 is configured to control different power levels of the air pump by integrating information such as incoming flow wind speed, power curve, weather condition, and the like, and further control the amount of the gas ejected from the exhaust hole 4, so that the vortex center of the vortex flow is better reduced by the gas ejected from the exhaust hole 4.

As shown in fig. 10, a wind turbine generator set including a fan blade 14 as described below is also disclosed in the present embodiment. The fan blade 14 incorporates the air flow control means described above. According to the wind generating set, the air flow control device is arranged on the fan blade 14, so that the energy exchange between the surface of the fan blade 14 and the outside can be effectively improved, the utilization rate of wind energy of the wind generating set is improved, and the generating capacity is improved.

In the present embodiment, the air flow control device is provided on the leeward side of the root end of the fan blade 14. The reason is that the aerodynamic performance of the blade is reduced due to the fact that boundary layer flow separation is easily generated in the blade root area, and the air flow control device is arranged close to the blade root of the fan blade 14, so that the boundary layer flow separation generated in the blade root area can be delayed.

When the fan blade is installed, a first opening is formed between the front ends of the first vertical plate 1 and the second vertical plate 2, a second opening is formed between the rear ends of the first vertical plate 1 and the second vertical plate 2, the first opening faces the front edge of the fan blade 14, and the second opening faces the rear edge of the fan blade 14. By adopting the structure, larger vortex can be obtained, and the flow separation of airflow can be delayed.

In other embodiments, the air flow control device may also be mounted on the windward side of the root end, the windward side of the tip end, or the leeward side of the tip end of the fan blade 14.

Of course, in other embodiments, the air flow control device may be disposed at other positions on the windward side or the leeward side of the fan blade 14, the entire windward side or the entire leeward side, or both the windward side and the leeward side, and other mounting positions or manners will not be described in detail herein.

As shown in fig. 10, the wind turbine generator system of the present invention includes a tower 11 and a nacelle 12 mounted on an upper end of the tower 11, and a fan blade 14 provided with a hub 13 is mounted on the nacelle 12. The air pump and the controller 9 of the air flow control device are arranged in the cabin 12, and the air pump is connected with the exhaust hole 4 on the air flow control device through an air transmission pipeline 10.

The manner of mounting the air flow control device on the surface of the fan blade 14 includes, but is not limited to, using a mounting medium such as adhesive glue, double-sided tape, etc., and the mounting medium does not block the air passage, air hole, etc. of each component in the air flow control device during the application process, so as to prevent the air flow control device from being inoperable.

The following describes a process of mounting the plurality of control units 100 of the air flow control apparatus on the surface of the fan blade 14 by the double-sided adhesive tape in the present embodiment with reference to fig. 11(a) -11 (g):

referring to fig. 11(a), a marking line is formed on the surface of the fan blade 14, and a first tape area 15 and a second tape area 16 on both sides of the marking line are respectively adhered with double-sided tapes, wherein the first tape area 15 is close to the front edge of the blade, and the second tape area 16 is close to the rear edge of the blade. The width of the double-sided tape of the first tape area 15 is the same as the width of the bottom plate 5, and the width of the double-sided tape of the second tape area 16 is the same as the width of the exhaust plate 3.

As shown in fig. 11(b), the front end edge of the exhaust plate 3 is aligned with the marking line, and the exhaust plate 3 is mounted on the double-sided tape of the second tape region 16.

Referring to fig. 11(c), the air holes of the first communication hole 502 of the rear end edge of the bottom plate 5 are aligned with the protrusions 301 of the front end of the exhaust plate 3, respectively, the rear end edge of the bottom plate 5 is aligned with the mark line, and the bottom plate 5 is mounted on the double-sided tape of the first tape region 15 after the alignment.

Referring to fig. 11(d), the insert 7 of the first vertical plate 1 and the insert 7 of the second vertical plate 2 are inserted into the first passages 501 at both ends of the bottom plate 5, respectively, and the first vertical plate 1 and the second vertical plate 2 are mounted on the double-sided adhesive tape of the first adhesive tape region 15.

Referring to fig. 11(e), the second channel 601 of the partition plate 6 is aligned with the other end of the insert 7 of the second vertical plate 2, the rear end edge of the partition plate 6 is aligned with the marking line, and the partition plate 6 is mounted on the double-sided tape of the first tape region 15.

Referring to fig. 11(f), the control unit 100 of the remaining air flow control devices is sequentially attached according to the above-described flow.

As shown in fig. 11(g), after all the control units 100 are mounted, the excess double-sided tape is removed, and the mounting of the control units 100 on the blade surface is completed.

After the control unit 100 is mounted on the surface of the fan blade 14, the through-holes 701 of the inserts 7 of the first vertical plate 1 in the group of control units 100 closest to the blade tip are closed. The through holes 701 of the inserts 7 of the second vertical plate 2 in the group of control units 100 closest to the blade root are hermetically connected with the air outlet of the air pump through air pipes.

The air flow control device can generate vortex through the two vertical plates 1 and 2 arranged on the surface of the fan blade 14, so that the air flow outside the boundary layer is doped into the boundary layer, the momentum of the air flow of the boundary layer is increased, the stall is delayed, and the passive flow control is performed on the air flow on the surface of the fan blade 14; and under the condition of starting the air pump, the air flow is ejected from the air exhaust holes 4 in the air exhaust plate 3 behind the two vertical plates 1 and 2, energy is injected into the blade boundary layer, and simultaneously, the vortex cores generated by the two vertical plates 1 and 2 are guided to move downwards, so that the active flow control is performed on the air flow on the surface of the fan blade 14. By combining the two flow control modes, boundary layer flow separation can be effectively inhibited, and power generation loss caused by stalling of the fan blade 14 is prevented.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.

Claims

1. The air flow control device is characterized by comprising at least one control unit, wherein the control unit comprises two vertical plates and an exhaust assembly, the vertical plates are oppositely arranged, the distance between the two vertical plates is gradually increased from front to back, the exhaust assembly is provided with an exhaust hole capable of injecting gas, and the exhaust hole is arranged in the rear side area between the two vertical plates;

the exhaust assembly further comprises an air supply mechanism and an exhaust plate, an air outlet of the air supply mechanism is communicated with the exhaust hole, and the exhaust hole is formed in the upper surface of the exhaust plate;

the air flow control device further comprises a bottom plate, the two vertical plates are installed on the bottom plate, a first channel and a first communicating port communicated with the first channel are arranged in the bottom plate, a second communicating port communicated with the exhaust hole is arranged on the exhaust plate, and the first communicating port and the second communicating port are correspondingly communicated.

2. An air flow control apparatus according to claim 1, wherein the discharge plate has an air inlet passage therein, the air inlet passage communicating with the discharge hole, and an air outlet of the air feed mechanism communicating with the air inlet passage.

3. An air flow control apparatus according to claim 1, wherein the exhaust plate has a thickness that decreases gradually from front to rear, and the exhaust hole is provided near a front end of the exhaust plate.

4. An air flow control apparatus as claimed in claim 1, wherein the thickness of the base plate increases from the front end of the riser to the rear end of the riser.

5. An air flow control device according to claim 1, wherein the first communication port, the second communication port, and the air discharge hole are each provided in plural in a direction in which the first passage extends, and the number of the air discharge holes is the same as that of the second communication port.

6. An air flow control apparatus according to claim 1, wherein the air flow control apparatus has a plurality of said control units, and a partition plate is provided between adjacent ones of said control units, and a second passage is provided in said partition plate, and said first passages of adjacent ones of said control units communicate with each other through said second passage.

7. An air flow control apparatus according to claim 6, wherein an insert having a through hole is provided on the vertical plate, the vertical plate is installed between the bottom plate and the partition plate through the insert, one end of the insert is inserted into the first passage, the other end of the insert is inserted into the second passage, and the first passage and the second passage are communicated through the through hole.

8. An air flow control apparatus according to claim 6, wherein the distance from the end of the base plate remote from the partition plate to the end of the partition plate remote from the base plate is the same as the length of the exhaust plate.

9. The air flow control apparatus of claim 1, wherein the height of the riser increases gradually from front to back.

10. An air flow control device as recited in claim 1, further comprising a controller for controlling the amount of gas ejected from the exhaust vent.

11. A fan blade characterised in that it incorporates an air flow control device as claimed in any one of claims 1 to 10.

12. The fan blade of claim 11 wherein the air flow control device is disposed on a windward side and/or a leeward side of the fan blade;

13. The fan blade of claim 12 wherein the air flow control device is disposed proximate a blade root of the fan blade.

14. A wind park according to any of claims 11-13, wherein the wind park comprises a fan blade according to any of claims 11-13.