A wind turbine blade vortex generator and a wind turbine blade

Abstract

The present invention provides a vortex generator for wind turbine blades, which relates to the field of wind power technology and solves the technical problem in the prior art that the boundary layer separation phenomenon will occur during the rotation of the wind turbine, resulting in increased blade resistance and affecting the power generation capacity of the wind turbine. The device is a vortex generator for wind turbine blades, a bottom plate, which is used to be installed and fixed on the wind turbine blades; two fins are provided, and the two fins are symmetrically installed on the bottom plate. The fins are provided with horizontal side surfaces, inclined side surfaces and vertical side surfaces, and the horizontal side surfaces, the inclined side surfaces and the vertical side surfaces are connected end to end in sequence. The horizontal side surfaces are used to contact and be installed on the bottom plate, and the inclined side surfaces extend from the connection point of the horizontal side surfaces in an inclined direction away from the bottom plate and are connected to the vertical side surfaces. The inclined side surfaces are used to face the airflow direction, and the vertical side surfaces are perpendicular to the rotation direction of the wind turbine blades. The ends of the two fins facing the airflow direction are closer than the ends of the two fins facing the rotation direction of the wind turbine blades.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power, and in particular to a wind power blade vortex generator and a wind turbine blade. Background Art

[0002] At present, boundary layer separation occurs during the rotation of the fan, that is, when the angle of attack is relatively small, the airflow closely adheres to the blade surface to form a stable boundary layer. When the angle of attack increases to a critical value, the kinetic energy of the fluid in the entire boundary layer of a certain area on the blade surface is not enough to maintain the flow downstream for a long time, and boundary layer separation occurs at this time. After the boundary layer separates, the lift acting on the blade decreases and the resistance increases accordingly, thereby affecting the blade's ability to capture wind energy.

[0003] It hinders the rotation of the wind turbine, thereby affecting the wind turbine's power generation capacity.

[0004] Therefore, it is urgent to develop a wind turbine blade vortex generator to solve the above technical problems. Summary of the invention

[0005] The purpose of the present invention is to provide a vortex generator for wind turbine blades to solve the technical problem that the boundary layer separation phenomenon occurs during the rotation of the wind turbine in the prior art, resulting in increased blade resistance and affecting the power generation capacity of the wind turbine. The preferred technical solutions among the many technical solutions provided by the present invention can produce many technical effects as described below.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a wind turbine blade vortex generator, comprising:

[0008] A bottom plate, used for mounting and fixing on the fan blades;

[0009] Two fins are provided, and the two fins are symmetrically installed on the base plate. The fins are provided with horizontal sides, inclined sides and vertical sides. The horizontal sides, inclined sides and vertical sides are connected end to end in sequence. The horizontal side is used for contacting and installing on the base plate. The inclined side extends from the connection point of the horizontal side in an inclined direction away from the base plate and is connected to the vertical side. The inclined side is used to face the airflow direction. The vertical side is perpendicular to the rotation direction of the fan blades. The ends of the two fins facing the airflow direction are closer than the ends of the two fins facing the rotation direction of the fan blades.

[0010] Furthermore, each of the fins is provided with a swinging assembly, which includes a positioning shaft and a spring. The bottom plate is provided with two limit grooves, each of the limit grooves includes two relatively inclined surfaces and a vertical surface. The positioning shaft is fixedly connected to the bottom surface of the limit groove, and one end of the fin away from the oncoming airflow is rotatably sleeved on the positioning shaft. One end of the spring abuts against the vertical surface of the limit groove, and the other end of the spring abuts against the side wall of the fin to push the end of the fin facing the airflow to abut against the inclined surface.

[0011] Furthermore, the two opposite side walls of the fins are respectively provided with streamline protrusions, and the streamline protrusions are arranged to protrude outward from the side wall plane as a whole. The streamline protrusions start from the connection point of the horizontal side surface and the inclined side surface and end at the edge of the vertical side surface. The streamline protrusions gradually protrude outward from the starting point in a direction perpendicular to the side surface and reach the highest point in the middle of the fin and then gradually descend to the end point.

[0012] Furthermore, the opposite side walls of the two fins are respectively provided with streamline protrusions, the length extension direction of the streamline protrusions is parallel to the horizontal side surface, the starting point of the streamline protrusions is located in the middle of the inclined side surface, and the end point of the streamline protrusions is located in the middle of the vertical side surface. The streamline protrusions gradually protrude outward from the starting point in a direction perpendicular to the side surface and reach the highest point and then gradually descend to the end point.

[0013] Furthermore, the fin is provided with a serrated tail wing, the serrated tail wing is arranged on the vertical side surface of the fin, and the serrated tail wing includes a plurality of tooth blocks fixedly connected to the vertical side surface.

[0014] Furthermore, a horizontal plane parallel to the horizontal side surface is provided at the connection point between the inclined side surface and the vertical side surface, and the side surface of the tooth block connected to the fin and close to the horizontal plane overlaps with the horizontal plane and extends in a direction parallel to the horizontal plane.

[0015] Furthermore, the tooth block connected to the fin and close to the horizontal side surface has a side surface that overlaps with the horizontal side surface and extends in a direction parallel to the horizontal side surface.

[0016] Furthermore, a chamfer is provided at a connection point between the inclined side surface and the vertical side surface, that is, the connection point between the inclined side surface and the vertical side surface is provided as an arc surface.

[0017] Furthermore, the fins are coated with a nano coating, the nano coating is wrapped around the fins, and the nano coating is made of a super-hydrophobic material.

[0018] A fan blade, a vortex generator, and a blade body. A plurality of vortex generators are provided, and the plurality of vortex generators are arranged along the length direction of the blade body, and adjacent vortex generators are arranged in a stepped manner.

[0019] The preferred technical solution of the present invention can at least produce the following technical effects:

[0020] During use, the base plate of the vortex generator is fixedly connected to the blade of the fan, and one end of the horizontal side and the inclined side is directed to the direction of the airflow during the rotation of the blade, that is, the wind of the blade will be blown from the connection point of the horizontal side and the inclined side to the vertical side during the rotation of the blade. Therefore, when a large airflow blows towards the blade of the fan, the two fins located on the base plate will cut the airflow, that is, the triangle formed by the horizontal side and the inclined side will form a small cyclone after cutting the airflow, thereby generating a strong wingtip vortex on the blade. The wingtip vortex will attach to the blade, thereby giving the blade increased power. As the blade continues to rotate, the energy of the wingtip vortex will disappear as the blade is driven to rotate, but it will also be supplemented by the cutting action of the fin as the blade rotates, so that the wingtip vortex will be attached to the surface of the blade without separation, thereby promoting the rotation of the blade and thus improving the power generation capacity of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure provided by Example 1 of the present invention;

[0023] Figure 2 is a schematic diagram of the fin structure provided in Example 1 of the present invention;

[0024] Figure 3 It is a schematic diagram of the overall structure provided by Embodiment 2 of the present invention;

[0025] Figure 4 is a schematic diagram of the overall structure provided by Embodiment 3 of the present invention;

[0026] Figure 5 is a schematic diagram of the overall structure provided by Embodiment 4 of the present invention;

[0027] Figure 6 is a schematic diagram of the overall structure provided by Example 5 of the present invention;

[0028] Figure 7 is a schematic diagram of the overall structure provided by Example 6 of the present invention;

[0029] Figure 8 is a schematic diagram of the overall structure provided by Example 7 of the present invention;

[0030] Fig. 9 is a schematic diagram of the overall structure provided by Example 8 of the present invention;

[0031] Fig.10 It is a partial structural diagram provided by Example 8 of the present invention;

[0032] Fig.11 It is a schematic diagram of the overall structure provided by Example 9 of the present invention.

[0033] Explanation of the reference numerals: 100, bottom plate; 110, limiting groove; 200, fin; 210, inclined side; 220, vertical side; 230, horizontal side; 240, horizontal plane; 250, arc surface; 260, serrated tail wing; 270, streamline protrusion; 280, rotating hole; 300, swing assembly; 310, spring; 320, positioning shaft; 400, blade body. DETAILED DESCRIPTION

[0034] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0035] In the description of the present invention, it should be noted that, unless otherwise specified, the meaning of "plurality" is two or more; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The following is combined with Figure 1-11The present application is further described in detail. An embodiment of the present application discloses a wind turbine blade vortex generator and a wind turbine blade.

[0038] Example 1

[0039] Reference Figure 1 and Figure 2 As shown, a vortex generator for a wind turbine blade includes a base plate 100 and two fins 200, wherein the fins 200 are fixedly mounted on the base plate 100, and the two fins 200 are arranged approximately in a right-angled triangle. Among them, one right-angled surface of the fin 200 is a horizontal side surface 230, the other right-angled surface of the fin 200 is a vertical side surface 220, and the inclined surface of the fin 200 is an inclined side surface 210, that is, the horizontal side surface 230, the inclined side surface 210 and the vertical side surface 220 are connected end to end in sequence. During the installation process, the horizontal side surface 230 of the fin 200 is fixedly connected to the base plate 100, and the inclined side surface 210 extends from the connection point of the horizontal side surface 230 in a direction away from the base plate 100, and the vertical side surface 220 is arranged with its length extending in a direction perpendicular to the base plate 100.

[0040] When the two fins 200 are fixedly mounted on the bottom plate 100 , the distance between the two tips of the two fins 200 , i.e., the ends where the inclined side 210 and the horizontal side 230 are connected, is smaller than the distance between the vertical side 220 of the two fins 200 .

[0041] When the base plate 100 is installed on the blade of the fan, the end where the inclined side 210 of the fin 200 is connected to the horizontal side 230 is facing the direction of the airflow, that is, the connection end between the inclined side 210 and the horizontal side 230 of the fin 200 is the first point where the fin 200 contacts the airflow during the rotation of the fan.

[0042] Therefore, when a large airflow blows toward the blades of the fan during the rotation of the fan, the two fins 200 located on the bottom plate 100 will cut the airflow, that is, the triangle formed by the horizontal side 230 and the inclined side 210 will form a small cyclone after cutting the airflow, thereby generating a strong wingtip vortex on the blade. The wingtip vortex will attach to the blade, thereby giving the blade increased power. As the blade continues to rotate, the energy of the wingtip vortex will disappear as the blade is driven to rotate, but it will also be supplemented by the cutting action of the fins 200 as the blade rotates, so that the wingtip vortex will be attached to the surface of the blade without separation, thereby promoting the rotation of the blade and thus improving the power generation capacity of the fan.

[0043] In addition, the two fins 200 located on the same base plate 100 are close to each other at the connection ends of the inclined side 210 and the horizontal side 230 of the fin 200, so that the tips of the two fins 200 form a relative cone on the same base plate 100, further cutting the airflow and better supplementing the formation of the cyclone.

[0044] A horizontal plane 240 parallel to the horizontal side 230 is provided at the connection point of the inclined side 210 and the horizontal side 230. The horizontal plane 240 replaces the sharp angle formed at the connection between the inclined side 210 and the horizontal side 230, thereby preventing the tip of the connection between the inclined side 210 and the horizontal side 230 from vibrating when the blade is installed on the blade and rotated, thereby affecting the airflow to form a cyclone.

[0045] The bottom plate 100 and the fins 200 are coated with a nano coating, which completely wraps the bottom plate 100 and the fins 200, and the nano coating is made of super-hydrophobic material. Super-hydrophobic materials are mainly nano-organic silicon compound materials, which have excellent hydrophobicity and hydrophobic migration. The free small molecules wrap the dirt on the surface, making the surface hydrophobic. Therefore, it is difficult for water to form a continuous water film on the surface of the dirt layer, but it condenses into water droplets separated from each other and falls off the surface under the action of centrifugal force. New nano-functional particles are added to the material to improve the application performance of the product such as flame retardancy, weather resistance and hardness.

[0046] This achieves waterproof, anti-icing and anti-corrosion functions.

[0047] Example 2

[0048] The difference between this embodiment and the first embodiment lies in the setting of the connection point between the inclined side surface 210 and the horizontal side surface 230 .

[0049] Reference Figure 3 As shown, the connection point between the inclined side surface 210 and the horizontal side surface 230 is rounded, that is, the connection point between the inclined side surface 210 and the horizontal side surface 230 is set as an arc surface 250. The arc surface 250 replaces the sharp corner formed at the connection between the inclined side surface 210 and the horizontal side surface 230, thereby avoiding stress concentration at the sharp corner formed at the connection between the inclined side surface 210 and the horizontal side surface 230, and extending the service life of the fin 200. In addition, the corner where the arc surface 250 is set is also more convenient for the flow of airflow, and can also effectively guide the airflow to form a cyclone.

[0050] Example 3

[0051] The difference between this embodiment and the first embodiment is that a sawtooth tail wing 260 is provided.

[0052] Reference Figure 4As shown, the sawtooth tail 260 includes a plurality of tooth blocks arranged on the vertical side 220, and the plurality of tooth blocks are evenly arranged along the length direction of the vertical side 220. The plurality of tooth blocks are arranged sequentially from the middle to both ends of the vertical side 220. The tooth blocks can be formed integrally with the fin 200, and the tooth blocks can also be fixedly connected to the fin 200 by welding or other methods, thereby improving the connectivity between the fin 200 and the tooth blocks.

[0053] By arranging teeth blocks on the fin 200, the noise caused by the shedding of small vortices formed by the airflow on the fin 200 is reduced. The teeth blocks installed on the fin 200 can suppress the vortex shedding phenomenon caused by the laminar boundary layer, reduce the lift pulsation of the fin 200 and the surface pressure pulsation near the vertical side 220 of the fin 200, weaken the low-frequency turbulent pulsation and vorticity at the vertical side 220, and effectively reduce the spanwise correlation of the vortex near the trailing edge. The combined effect of these factors reduces the self-noise of the fin 200.

[0054] Example 4

[0055] The difference between this embodiment and embodiment 3 is that the tooth blocks are arranged at different positions.

[0056] Reference Figure 5 As shown, the sawtooth tail 260 is provided with a plurality of tooth blocks on the vertical side surface 220, and the plurality of tooth blocks are arranged in sequence from the end of the vertical side surface 220 close to the bottom plate 100 to the end of the vertical side surface 220 away from the bottom plate 100. The side surface of the tooth block provided on the end of the vertical side surface 220 close to the bottom plate 100 and the horizontal side surface 230 overlap on the same horizontal plane 240.

[0057] That is, when the tooth block is integrally provided or welded with the fin 200 , the side wall of the tooth block disposed near the horizontal side surface 230 coincides with the plane of the horizontal side wall and is in the same extending direction.

[0058] Thus, the tooth block close to the horizontal side wall just abuts against the bottom plate 100, thereby avoiding a gap between the tooth block and the bottom plate 100, causing airflow to blow into the gap and affect the connection between the fin 200 and the bottom plate 100. In addition, the gap formed between the tooth block and the bottom plate 100 may also cause noise.

[0059] Example 5

[0060] The difference between this embodiment and embodiment 3 is that the tooth blocks are arranged at different positions.

[0061] Reference Figure 6As shown, the vertical side surface 220 is provided with a plurality of tooth blocks, and the plurality of tooth blocks are arranged in sequence from the end of the vertical side surface 220 away from the bottom plate 100 to the end of the vertical side surface 220 close to the bottom plate 100. The side surface of the tooth block provided at the end of the vertical side surface 220 away from the bottom plate 100 and the inclined side surface 210 overlap on the same horizontal plane 240.

[0062] That is, when the tooth block is integrally provided or welded with the fin 200 , the side wall of the tooth block disposed near the inclined side surface 210 coincides with the plane of the inclined side wall and is in the same extending direction.

[0063] Therefore, when the fin 200 forms a cut on the airflow, the airflow will just flow in the extension direction of the inclined side surface 210. If the side surface of the tooth block close to the inclined side surface 210 does not overlap with the inclined side surface 210 on the same horizontal plane 240, the side surface of the tooth block and the inclined side wall may form a step, thereby affecting the flow direction of the airflow. If the inclined surface of the extended rack is made thinner, it is easy to vibrate, generate noise, and affect the noise reduction effect.

[0064] Example 6

[0065] The difference between this embodiment and the first embodiment is that two mutually symmetrical side walls of the fin 200 are provided with streamline protrusions 270 .

[0066] Reference Figure 7 As shown, the length extension direction of the streamline protrusion 270 is parallel to the horizontal side surface 230, the starting point of the streamline protrusion 270 is located in the middle of the inclined side surface 210, and the end point of the streamline protrusion 270 is located in the middle of the vertical side surface 220. That is, the streamline protrusion 270 is extended from its starting point to its end point along its length extension direction, and the side surface of the streamline protrusion 270 is an arc surface 250 in its extension direction and gradually protrudes outward in a direction perpendicular to the side surface, and when it reaches the highest point, that is, a certain height, it gradually decreases to just its end point.

[0067] The fin 200 guides the airflow from one side of the inclined surface to one side of the vertical side surface 220 during use. After the fin 200 cuts the airflow, the horizontally arranged streamline protrusions 270 guide the airflow to reduce the wind resistance of the airflow to the fin 200.

[0068] In addition, the streamline protrusion 270 is arranged horizontally. After the fin 200 cuts the airflow, the fin 200 will continue to rotate with the fan blade, so that more airflow will pass under the streamline protrusion 270, thereby having a lifting and pushing effect on the streamline protrusion 270, and also reducing the resistance of the inclined side 210 of the fin 200 in the process of cutting the airflow.

[0069] Example 7

[0070] The difference between this embodiment and Embodiment 6 is that the arrangement structure of the streamline protrusion 270 is different.

[0071] Reference Figure 8 As shown, the streamline protrusion 270 is protruded outward from the side wall plane of the fin 200 as a whole, and the starting point of the streamline protrusion 270 is the connection point of the horizontal side surface 230 and the inclined surface, and the end point of the streamline protrusion 270 is the edge of the vertical side surface 220. In this way, the extension direction of the streamline protrusion 270 extends from the starting point to the end point, and during the extension process, it gradually protrudes outward in a direction perpendicular to the side surface and forms the highest point in the middle of the fin 200 and then gradually decreases to the end point.

[0072] Therefore, the side surface of the fin 200 is completely streamlined. When the fin 200 cuts the airflow, it is easier to guide the cut airflow to flow backward and converge into a smaller cyclone, thereby adapting to airflows from more different directions.

[0073] Example 8

[0074] The difference between this embodiment and the first embodiment is that a swing assembly 300 is provided on each fin 200 .

[0075] Reference Fig. 9 and Fig.10 As shown, the swing assembly 300 includes a positioning shaft 320 and a spring 310, and the bottom plate 100 is provided with a limiting groove 110 corresponding to the fin 200. The limiting groove 110 includes two inclined surfaces and a vertical surface that are arranged opposite to each other, and the distance between the two vertical surfaces of the two limiting grooves 110 on the same bottom plate 100 is greater than the distance between the two inclined surfaces, that is, the two inclined surfaces are located between the two vertical surfaces.

[0076] The positioning shaft 320 is fixedly connected to the bottom plate 100, and the positioning shaft 320 is disposed in the bottom surface of the limiting groove 110, and the axial direction of the positioning shaft 320 is perpendicular to the bottom surface of the limiting groove 110. A rotation hole 280 is opened at one end of the fin 200 close to the vertical side surface 220, and the rotation hole 280 is close to two-thirds of the vertical side surface 220 in the length direction of the horizontal side surface 230.

[0077] The fin 200 is sleeved on the positioning shaft 320, and the spring 310 is arranged near the connection point between the horizontal side surface 230 and the inclined side surface 210. That is, one end of the spring 310 is fixedly connected to the vertical surface, and the other end of the spring 310 is fixedly connected to the side wall of the fin 200, so that the fin 200 abuts against the inclined surface under the action of the spring 310.

[0078] Thereby, the tips of the two fins 200 of the same base plate 100 are brought close to each other. When extreme wind conditions occur, the strong airflow will blow the fins 200 to rotate around the positioning axis 320, thereby adjusting the angle between the fins 200 to adapt to the incoming wind speed, obtain the best angle, and obtain the best performance improvement effect. At full wind speed, the fins 200 are parallel to the incoming wind direction, at which time the performance improvement is zero, and the influence of the vortex generator on the blade load is minimized. Among them, the swing angle range of the fins 200 is between 0° and 12°.

[0079] Example 9

[0080] A fan blade includes a blade body 400 and a plurality of vortex generators arranged on the blade body 400, that is, the bottom plates 100 of the vortex generators are arranged along the length direction of the blade body 400, and two adjacent bottom plates 100 are arranged in a stepped manner, that is, the two bottom plates 100 are relatively misaligned in the width direction of the blade body 400. This ensures that the vortex generators are relatively arranged on the width midline of the blade, so that the generated small vortex is at the relative position of the blade, ensuring the stability of the blade during rotation.

[0081] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A wind turbine blade vortex generator, characterized in that: include: A bottom plate (100) is used for being mounted and fixed on the fan blades; The fins (200) are provided with two fins (200), the two fins (200) are symmetrically mounted on the bottom plate (100), the fins (200) are provided with a horizontal side surface (230), an inclined side surface (210) and a vertical side surface (220), the horizontal side surface (230), the inclined side surface (210) and the vertical side surface (220) are connected end to end in sequence, the horizontal side surface (230) is used for contacting and mounting on the bottom plate (100), the inclined side surface (210) extends from the connection point of the horizontal side surface (230) in a direction away from the bottom plate (100) and is connected to the vertical side surface (220), the inclined side surface (210) is used for facing the airflow direction, the vertical side surface (220) is perpendicular to the rotation direction of the fan blade, and the ends of the two fins (200) facing the airflow direction are opposite to the two ends. The fin (200) is closer to the end facing the rotation direction of the fan blade; each of the fins (200) is provided with a swing assembly (300), the swing assembly (300) comprises a positioning shaft (320) and a spring (310); the bottom plate (100) is provided with two limiting grooves (110), each limiting groove (110) comprises two inclined surfaces and a vertical surface arranged oppositely; the positioning shaft (320) is fixedly connected to the bottom surface of the limiting groove (110); one end of the fin (200) away from the oncoming airflow is sleeved and rotatably arranged on the positioning shaft (320); one end of the spring (310) abuts against the vertical surface of the limiting groove (110), and the other end of the spring (310) abuts against the side wall of the fin (200) to push the end of the fin (200) facing the airflow to abut against the inclined surface.

2. A wind turbine blade vortex generator according to claim 1, characterized in that: The two opposite side walls of the two fins (200) are respectively provided with streamline protrusions (270), and the streamline protrusions (270) are arranged to protrude outward from the side wall plane as a whole. The streamline protrusions (270) start from the connection point of the horizontal side surface (230) and the inclined side surface (210) and end at the edge of the vertical side surface (220). The streamline protrusions (270) gradually protrude outward from the starting point in a direction perpendicular to the side surface and reach the highest point in the middle of the fin (200) and then gradually descend to the end point.

3. A wind turbine blade vortex generator according to claim 1, characterized in that: The two opposite side walls of the two fins (200) are respectively provided with streamline protrusions (270); the length extension direction of the streamline protrusions (270) is parallel to the horizontal side surface (230); the starting point of the streamline protrusions (270) is located in the middle of the inclined side surface (210); the end point of the streamline protrusions (270) is located in the middle of the vertical side surface (220); the streamline protrusions (270) gradually protrude outwards from the starting point in a direction perpendicular to the side surface and reach the highest point and then gradually descend to the end point.

4. A wind turbine blade vortex generator according to claim 1, characterized in that: The fin (200) is provided with a sawtooth tail wing (260), the sawtooth tail wing (260) is arranged on a vertical side surface (220) of the fin (200), and the sawtooth tail wing (260) comprises a plurality of tooth blocks fixedly connected to the vertical side surface (220).

5. A wind turbine blade vortex generator according to claim 4, characterized in that: A horizontal plane (240) parallel to the horizontal side surface (230) is provided at the connection point between the inclined side surface (210) and the vertical side surface (220), and the tooth block connected to the fin (200) and close to the horizontal plane (240) has its side surface overlapped with the horizontal plane (240) and extends in a direction parallel to the horizontal plane (240).

6. A wind turbine blade vortex generator according to claim 4, characterized in that: The tooth block connected to the fin (200) and close to the horizontal side surface (230) has its side surface overlapped with the horizontal side surface (230) and extends in a direction parallel to the horizontal side surface (230).

7. A wind turbine blade vortex generator according to claim 4, characterized in that: A chamfered corner is provided at the connection point between the inclined side surface (210) and the vertical side surface (220), that is, the connection point between the inclined side surface (210) and the vertical side surface (220) is provided as an arc surface (250).

8. The vortex generator for wind turbine blades according to claim 1, characterized in that: The fin (200) is coated with a nano coating, the nano coating is wrapped around the fin (200), and the nano coating is made of a super-hydrophobic material.

9. A fan blade, characterized in that: It comprises a vortex generator for a wind turbine blade as claimed in claims 1 to 8, and also comprises a blade body (400), wherein a plurality of the vortex generators are arranged, the plurality of the vortex generators are arranged along the length direction of the blade body (400), and adjacent vortex generators are arranged in a stepped manner.

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