A wind turbine blade

Abstract

The present invention is used in the field of wind turbines, and particularly relates to a wind turbine blade, which includes a blade and a vibration suppression device. The vibration suppression device includes an extension plate, and a plurality of grid structures are provided on the extension plate. Along the length direction of the extension plate, the grid structures are arranged at intervals on the extension plate. The extension plate is installed at the trailing edge of the windward surface of the blade and forms an angle with the windward surface of the blade. The extension direction of the extension plate on the blade is the same as the extension direction of the blade. The extension plate can provide an irregular windward surface for the trailing edge of the blade. When the blade is in a stationary state, the airflow flowing through the trailing edge of the blade will be divided by the grid structures on the extension plate, thereby avoiding the generation of periodic separation vortices on the blade, suppressing the occurrence of vortex-induced vibration of the blade and damaging the blade, and effectively improving the service life of the blade.

Description

Technical Field

[0001] The present invention is used in the field of wind turbines, and particularly relates to a wind turbine blade. Background Art

[0002] From the perspective of fluid, for any non-streamlined object, at a certain constant flow velocity, vortices that detach from the surface of the structure will be alternately generated on both sides of the object. Similar to the Karman vortex street effect, these alternately emitted vortices will generate pulsating pressures that change periodically in the downstream and cross-stream directions on the object. If the object is elastically supported or allows elastic deformation at this time, then the pulsating fluid force will trigger periodic vibrations of the object. This regular vibration, in turn, will change the vortex emission pattern of its wake. This phenomenon of interaction between fluid and structure is called "vortex-induced vibration".

[0003] When the wind turbine is in a shutdown or stationary state and the impeller cannot move, when the incoming wind speed is constant and the incoming wind forms a certain angle with the blade chord line, periodic shedding vortices will be generated at the leading edge or trailing edge of the blade. When the frequency of the blade is close to the vortex shedding frequency, resonance will occur. If the resonance time is too long and the resonance amplitude is too large, it will damage the blade structure or even cause the blade to break, resulting in a short service life of the blade. Currently, there is no effective method in the industry to prevent vortex-induced vibration of stationary blades. Summary of the Invention

[0004] An object of the present invention is to at least solve one of the technical problems existing in the prior art, and provide a wind turbine blade that can effectively prevent vortex-induced vibration of stationary wind turbine blades and improve the service life of the blades.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a wind turbine blade, including a blade and a vibration suppression device. The vibration suppression device includes an extension plate, and a plurality of grid structures are provided on the extension plate. Along the length direction of the extension plate, the grid structures are arranged at intervals on the extension plate. The extension plate is installed at the trailing edge of the windward surface of the blade and forms an angle with the windward surface of the blade. The extension direction of the extension plate on the blade is the same as the extension direction of the blade.

[0006] The above technical solution has at least the following advantages or beneficial effects: The extension plate can provide an irregular windward surface for the trailing edge of the blade. When the blade is in a stationary state, the airflow flowing through the trailing edge of the blade will be divided by the grid structures on the extension plate, thereby avoiding the generation of periodic detachment vortices on the blade, suppressing vortex-induced vibration of the blade and damaging the blade, and effectively improving the service life of the blade.

[0007] Further as an improvement of the technical solution of the present invention, the vibration suppression device is a flexible structure.

[0008] As a further improvement of the technical solution of the present invention, the vibration suppression device is made of a highly elastic polymer material with reversible deformation.

[0009] As a further improvement of the technical solution of the present invention, the vibration suppression device further includes a connecting plate, the connecting plate is connected to the extension plate at an angle, and the vibration suppression device is installed on the trailing edge of the windward surface of the blade through the connecting plate.

[0010] As a further improvement of the technical solution of the present invention, the connecting plate is an adhesive plate.

[0011] As a further improvement of the technical solution of the present invention, one end of the vibration suppression device extends to the middle of the blade, and the other end of the vibration suppression device extends to the end of the blade.

[0012] As a further improvement of the technical solution of the present invention, the vibration suppression device is installed in the area at the 50%-98% position in the length direction of the blade.

[0013] As a further improvement of the technical solution of the present invention, in the direction from the root of the blade to the end of the blade, the size of the vibration suppression device gradually becomes smaller.

[0014] As a further improvement of the technical solution of the present invention, in the direction from the root of the blade to the end of the blade, the width gradient range of the connecting plate is 1%-10% of the width of the blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the drawings:

[0016] Figure 1 is a top view of a wind turbine blade in an embodiment of the present invention;

[0017] Figure 2 is Figure 1 a schematic structural diagram of the vibration suppression device in the shown embodiment;

[0018] Figure 3 is a cross-sectional view of a blade in an embodiment of the present invention and a schematic diagram of the swinging position of the extension plate at the trailing edge of the blade. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] This part will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the drawings. The role of the drawings is to supplement the description of the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the protection scope of the present invention.

[0020] In the present invention, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of the present invention, rather than indicating or implying that the technical features referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0021] In the present invention, the meaning of "a number of" is one or more, the meaning of "a plurality of" is two or more, and "greater than", "less than", "exceeding", etc. are understood not to include the base number; "above", "below", "within", etc. are understood to include the base number. In the description of the present invention, if "first" and "second" are described, they are only for the purpose of distinguishing technical features, and should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0022] In the present invention, unless otherwise clearly defined, terms such as "arranged", "installed", "connected", etc. should be understood in a broad sense. For example, they can be directly connected, or indirectly connected through an intermediate medium; they can be fixedly connected, or detachably connected, or integrally formed; they can be mechanically connected, or electrically connected or capable of communicating with each other; they can be the communication inside two components or the interaction relationship between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in the present invention in combination with the specific content of the technical solution.

[0023] See Figure 1 , the present invention provides a fan blade, which includes a blade 1 and a vibration suppression device 2.

[0024] See Figure 2 、 Figure 3 , the vibration suppression device 2 includes an extension plate 20. A plurality of grid structures 200 are provided on the extension plate 20. Along the length direction of the extension plate 20, the grid structures 200 are arranged at intervals on the extension plate 20. The extension plate 20 is installed at the trailing edge of the windward surface 100 of the blade 1 and forms an angle with the windward surface 100 of the blade 1. The extension direction of the extension plate 20 on the blade 1 is the same as the extension direction of the blade 1.

[0025] The extension plate 20 is a plate-like structure, and a grid structure 200 is provided at a certain distance interval on the extension plate 20, so that the grid structures 200 on the extension plate 20 and the flat plate structure 201 are staggered.

[0026] As Figure 2 shown, the extension plate 20 is a rectangular plate structure. Along the length direction of the extension plate 20, grid structures 200 are provided at both ends of the extension plate 20, and two grid structures 200 arranged at intervals are also provided in the middle of the extension plate 20.

[0027] Of course, the present application does not specifically limit the specific shape of the extension plate 20. Its specific shape can also be an elliptical or polygonal structure, etc. The specific structure can be set according to the actual on-site situation.

[0028] The extension plate 20 can provide an irregular windward surface for the trailing edge of the blade 1. When the blade 1 is in a stationary state, the airflow flowing through the trailing edge of the blade 1 will be divided by the grid structure 200 on the extension plate 20, thereby avoiding the generation of periodic separation vortices on the blade 1, suppressing the occurrence of vortex-induced vibration of the blade 1 and damaging the blade 1, and effectively improving the service life of the blade 1.

[0029] In some embodiments, the vibration suppression device 2 further includes a connecting plate 21. The extension plate 20 is connected to one side of the connecting plate 21, and the length of the connecting plate 21 is the same as the length of the extension plate 20. The extension plate 20 and the connecting plate 21 are connected to form an L-shaped structure. The vibration suppression device 2 is installed on the trailing edge of the windward surface 100 of the blade 1 through the connecting plate 21.

[0030] For example, in the present application, the connecting plate 21 is a rectangular plate structure. The rectangular extension plate 20 is vertically fixed to one side of the connecting plate 21. After horizontally connecting the connecting plate 21 to the surface of the trailing edge of the blade 1, the extension plate 20 will stand up on the blade 1 to form a windward surface at the trailing edge of the blade 1.

[0031] Furthermore, the connecting plate 21 is an adhesive plate structure.

[0032] Specifically, in the present application, the connecting plate 21 is a plate-like structure, and the bottom of the connecting plate 21 is provided with an adhesive surface. The connecting plate 21 can be directly adhered to the trailing edge position of the windward surface 100 of the blade 1 through the adhesive surface, thereby fixing the vibration suppression device 2 on the blade 1.

[0033] In some embodiments, the vibration suppression device 2 is a flexible structure. Specifically, the vibration suppression device 2 is made of a highly elastic polymer material.

[0034] In this way, when the airflow on the blade 1 flows towards the vibration suppression device 2, the extension plate 20 of the vibration suppression device 2 will change its shape under the action of wind force, that is, the extension plate 20 can flutter with the wind. This can improve the lift-drag ratio of the blade 1 and improve the aerodynamic characteristics of the blade 1, thereby optimizing the energy output of the wind turbine blade. At the same time, when the wind speed reaches a certain level, the degree of stretching of the extension plate 20 will also increase, and the vibration suppression device 2 can also play a role in unloading, which can solve the problem that the flap at the trailing edge of the existing blade 1 will increase the output of the impeller power and increase the load.

[0035] Specifically, as Figure 3 shown, the extension plate 20 can swing to various positions such as 213, 214, 215, 216, etc. under the action of wind force.

[0036] SeeFigure 1 , in some embodiments, one end of the vibration suppression device 2 extends to the middle of the blade 1, and the other end of the vibration suppression device 2 extends to the end of the blade 1.

[0037] Specifically, the vibration suppression device 2 is installed at the trailing edge of the windward surface 100 of the blade 1, and the position of the vibration suppression device 2 on the blade 1 is in the area range of 50%-98% of the blade 1 from the root of the blade 1.

[0038] In this way, the vibration suppression device 2 does not completely extend to the end of the blade 1, and there will be a 2% area at the end of the trailing edge of the blade 1 that is not extended by the vibration suppression device 2, ensuring that the airflow flowing through the end of the blade 1 will not be blocked by the vibration suppression device 2.

[0039] Since the overall shape of the blade 1 is a structure with its width gradually narrowing from the root to the end, in order to adapt to the shape of the blade 1, from the root to the end of the blade 1, the shape of the vibration suppression device 2 also gradually becomes smaller, ensuring that the vibration suppression device 2 is installed at the trailing edge of the windward surface 100 of the blade 1 and does not protrude from the trailing edge of the blade 1.

[0040] Specifically, in this application, in the direction from the root of the blade 1 to the end of the blade 1, the width gradient range of the connecting plate 21 is 1%-10% of the width of the blade 1, that is, the width of the connecting plate 21 extending in the middle of the blade 1 is 1% of the width of the middle blade 1, and the width of the connecting plate 21 extending at the end of the blade 1 is 10% of the width of the end blade 1.

[0041] It should be noted that the direction described in this application from the root of the blade 1 to the end of the blade 1 is Figure 1 the direction from left to right in

[0042] Of course, this application is not limited to the above embodiments. Those skilled in the art can make equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent variations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A fan blade, characterized in that: It includes a blade and a vibration suppression device. The vibration suppression device includes an extension plate, and a plurality of grid structures are provided on the extension plate. Along the length direction of the extension plate, the grid structures are arranged at intervals on the extension plate. The extension plate is installed at the trailing edge of the windward surface of the blade and forms an angle with the windward surface of the blade. The extension direction of the extension plate on the blade is the same as the extension direction of the blade. The vibration suppression device is a flexible structure. The vibration suppression device is made of a highly elastic polymer material with reversible deformation. When the airflow on the blade flows towards the vibration suppression device, the extension plate will change its shape under the action of wind force, that is, the extension plate can flutter with the wind.

2. The fan blade according to claim 1, wherein: The vibration suppression device further includes a connecting plate, and the connecting plate is connected to the extension plate at an angle. The vibration suppression device is installed at the trailing edge of the windward surface of the blade through the connecting plate.

3. The fan blade according to claim 2, wherein: The connecting plate is an adhesive plate.

4. The fan blade according to claim 1, characterized in that: One end of the vibration suppression device extends to the middle of the blade, and the other end of the vibration suppression device extends to the end of the blade.

5. The fan blade according to claim 4, characterized in that: The vibration suppression device is installed in the area at the 50%-98% position in the length direction of the blade.

6. The fan blade according to claim 2, wherein: In the direction from the root of the blade to the end of the blade, the size of the vibration suppression device gradually becomes smaller.

7. The fan blade according to claim 6, wherein: In the direction from the root of the blade to the end of the blade, the width variation range of the connecting plate is 1%-10% of the width of the blade.

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