A vibration-proof and turbulent device for blades of a wind turbine generator set

Abstract

This invention discloses a vibration damping and turbulence prevention device for wind turbine blades, comprising a net sleeve, a traction rope, a locking rope, and turbulence strips. The net sleeve includes a first net sleeve and a second net sleeve. The first net sleeve is fitted onto the blade surface and tied to the handle on the outside of the wind turbine hub by the traction rope. The turbulence strips are fixed to the first net sleeve by the locking rope and distributed along the length of the first net sleeve. Each pair of adjacent turbulence strips forms a symmetrical V-shaped structure. The second net sleeve is fitted onto the first net sleeve and covers the turbulence strips, forming a sandwich structure. The second net sleeve is fixed to the turbulence strips by the locking rope to allow the turbulence strips to better adhere to the blade surface. The sandwich structure formed by the first net sleeve, turbulence strips, and second net sleeve can provide the blade with a non-aerodynamic outer surface, thereby inducing turbulence in the airflow passing through the blade, increasing the aerodynamic damping in the oscillation direction, and effectively preventing vortex-induced vibration of the blade.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine blade vibration prevention, and in particular to a wind turbine blade vibration prevention and spoiler device. Background Art

[0002] For any non-streamlined object, at a certain constant flow rate, vortices will alternately fall off on both sides of the structure. Such alternating vortices will subject the structure to periodic fluctuating pressure in the flow direction and lateral direction. If the frequency of the fluctuating pressure is close to the natural frequency of the structure, it will induce periodic vibration of the structure. The vibration of the structure will in turn change its wake structure and aggravate the detachment of the surface vortex. This phenomenon of mutual coupling between fluid and structure is called "vortex-induced vibration".

[0003] The shutdown state of a wind turbine can be divided into shutdown with power on and shutdown without power. When a wind turbine is in shutdown state without power, such as during the period from the installation of the impeller to the power on and grid connection of the wind turbine, or during the power outage due to a fault, the impeller of the wind turbine cannot yaw or face the wind. When the angle between the incoming wind direction and the nacelle is large, that is, when the incoming wind direction forms a large angle with the chord length direction of the blade, the blade element attack angle of each section of the blade is large, and the vortex falls off rhythmically at the leading and trailing edges of the blade, resulting in stall. The flow in this state is unstable, and a vortex structure similar to the von Karman vortex street can be formed, which can subject the blade to periodically changing aerodynamic loads, and easily cause vortex-induced vibration of the blade. Although the blade structure has special elasticity and strength, if the vortex-induced vibration amplitude is too large and the duration is too long, the vortex-induced vibration may cause blade damage, which may require a lot of time for repair, resulting in large economic losses. A wind turbine may be in an off-power state for a long time, and currently there is no effective means in the industry to prevent vortex-induced vibration of the blades of a wind turbine when the wind turbine is in an off-power state. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to propose a safe, reliable, easy-to-carry, and simple-to-operate anti-vibration and spoiler device for wind turbine blades, which can effectively prevent vortex-induced vibration of wind turbine blades.

[0005] To achieve the above-mentioned purpose, the technical solution provided by the present invention is: an anti-vibration spoiler device for a wind turbine blade, comprising a mesh sleeve, a traction rope, a locking rope and a spoiler strip, the mesh sleeve comprising a first mesh sleeve and a second mesh sleeve, the first mesh sleeve is sleeved on the surface of the blade and tied to the handrail on the outer side of the wind turbine hub through the traction rope, the spoiler strip is fixed to the first mesh sleeve through the locking rope, and is distributed along the length direction of the first mesh sleeve, and each two adjacent spoiler strips are in an eight-shaped symmetrical structure, the second mesh sleeve is sleeved on the first mesh sleeve, and the spoiler strip is sleeved, that is, the first mesh sleeve, the spoiler strip, and the second mesh sleeve form a sandwich structure, and the second mesh sleeve is fixed to the spoiler strip through the locking rope so that the spoiler strip is better attached to the surface of the blade, and the sandwich structure formed by the first mesh sleeve, the spoiler strip, and the second mesh sleeve can provide a non-aerodynamic outer surface for the blade, thereby inducing turbulence in the airflow passing through the blade, thereby effectively preventing the blade from vortex-induced vibration.

[0006] Furthermore, the first mesh sleeve is sleeved from the maximum chord length position to the blade tip position of the blade.

[0007] Furthermore, the first mesh sleeve is sleeved from the 60% position to the blade tip in the blade span direction.

[0008] Furthermore, the spoiler strip forms an angle of 10° to 80° with the chord length direction of the blade.

[0009] Furthermore, the spoiler strip is a column with edges, and is provided with a plurality of circular through holes for the locking rope to pass through.

[0010] Furthermore, the edge length of the spoiler strip is 20 mm to 2000 mm, and the diameter of the circular through hole is 1 / 50 to 1 / 2 of the edge length.

[0011] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0012] 1. The anti-vibration spoiler device is installed on the surface of the wind turbine blade (preferably from the 60% position to the blade tip in the blade span direction). The anti-vibration spoiler device consists of a first mesh sleeve, a second mesh sleeve and a spoiler strip. The spoiler strip is fixed to the mesh sleeve by a locking rope so that it can be better attached to the surface of the blade. The sandwich structure formed by the first mesh sleeve, the spoiler strip and the second mesh sleeve can provide a non-aerodynamic outer surface for the blade, thereby inducing turbulence in the airflow passing through the blade, greatly reducing the related instability of the airflow on the blade surface caused by stall, thereby effectively preventing the blade from vortex-induced vibration.

[0013] 2. When the wind turbine is not powered on and the impeller is stationary, the anti-vibration spoiler device can block the vortex shedding around the blades through the spoiler strips, increase the aerodynamic damping in the swing direction, effectively suppress the vibration of the blades in the swing direction, and avoid damage or breakage of the blades caused by vortex-induced vibration of the blades, thereby avoiding the economic losses caused thereby.

[0014] 3. This anti-vibration spoiler device is easy to install and carry, simple and reliable to operate, can greatly reduce the time of standard installation in the factory, installation in the yard and high-altitude installation, shorten the construction period of blade anti-vibration solution implementation, improve the production efficiency of blade manufacturers, and have better economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the structure of the anti-vibration spoiler device in the embodiment.

[0016] Figure 2 It is a partial enlarged view of the anti-vibration spoiler device in the embodiment.

[0017] Figure 3 1 is an axial view of a spoiler strip in an embodiment.

[0018] Figure 4 FIG. 4 is a top view of the spoiler strip in the embodiment. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0020] See also Figures 1 to 4 As shown, the anti-vibration spoiler device for the wind turbine blade provided in this embodiment includes a mesh sleeve, a spoiler strip 2, a traction rope 4 and locking ropes 6, 7, 8, 9, 10, 11, the mesh sleeve includes a first mesh sleeve 1 and a second mesh sleeve 3, the first mesh sleeve 1 is sleeved on the maximum chord length position to the blade tip position of the blade surface, and is tied to the handrail outside the wind turbine hub through the traction rope 4, the spoiler strip 2 is fixed to the first mesh sleeve 1 through the locking ropes 6, 7, 8, 9, and is distributed along the length direction of the first mesh sleeve 1, and every two adjacent spoiler strips 2 are in an eight-shaped symmetrical structure, and the spoiler strip 2 is 10° to 80° with the chord length direction of the blade. ° (preferably 45°~60°), the second mesh sleeve 3 is sleeved on the first mesh sleeve 1, and the spoiler strip 2 is sleeved, that is, the first mesh sleeve 1, the spoiler strip 2, and the second mesh sleeve 3 form a sandwich structure, and the second mesh sleeve 3 is fixed to the spoiler strip 2 by locking ropes 10, 11, so that the spoiler strip 2 can be better attached to the surface of the blade, and the sandwich structure formed by the first mesh sleeve 1, the spoiler strip 2, and the second mesh sleeve 3 can provide a non-aerodynamic outer surface for the blade, thereby inducing turbulence in the airflow passing through the blade, greatly reducing the related instability of the airflow on the blade surface caused by stall, and effectively preventing the blade from vortex-induced vibration.

[0021] Preferably, the first mesh sleeve 1 is sleeved from the 60% position to the blade tip in the blade span direction.

[0022] Preferably, the spoiler strip 2 can be a cube, a cuboid, a rhombus or any other shape with an edged column (preferably a triangular prism), and the length of the edge L1 is 20mm to 2000mm (preferably 100mm to 750mm). The spoiler strip 2 is provided with a plurality of circular through holes 5 for the locking rope to pass through, and preferably, the diameter of the circular through hole 5 is 1 / 50 to 1 / 4 (preferably 1 / 15 to 1 to 20) of the length of the edge L1.

[0023] Preferably, the first net sleeve 1, the spoiler strip 2, the second net sleeve 3, the traction rope 4 and the locking ropes 6, 7, 8, 9, 10, 11 can be made of any suitable non-metallic material. More preferably, the first net sleeve 1, the second net sleeve 3, the traction rope 4 and the locking ropes 6, 7, 8, 9, 10, 11 are made of fabric materials, and the spoiler strip 2 is made of plastic such as polystyrene, polyvinyl chloride, polyethylene, etc.

[0024] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A wind turbine blade anti-vibration spoiler device, characterized in that: The invention comprises a mesh sleeve, a traction rope (4), a locking rope and a spoiler strip (2), wherein the mesh sleeve comprises a first mesh sleeve (1) and a second mesh sleeve (3), wherein the first mesh sleeve (1) is sleeved on the surface of the blade and is tied to a handrail on the outside of the hub of the wind turbine generator set via the traction rope (4), wherein the spoiler strip (2) is fixed to the first mesh sleeve (1) via the locking rope and is distributed along the length direction of the first mesh sleeve (1), and each two adjacent spoiler strips (2) are in an eight-shaped symmetrical structure, and the second mesh sleeve (3) is sleeved on the first mesh sleeve (1). The first mesh sleeve (1), the spoiler strip (2) and the second mesh sleeve (3) are mounted on the blade and the spoiler strip (2) is covered, that is, the first mesh sleeve (1), the spoiler strip (2) and the second mesh sleeve (3) form a sandwich structure, and the second mesh sleeve (3) is fixed to the spoiler strip (2) by a locking rope, so that the spoiler strip (2) is better attached to the surface of the blade, and the sandwich structure formed by the first mesh sleeve (1), the spoiler strip (2) and the second mesh sleeve (3) can provide a non-aerodynamic outer surface for the blade, thereby inducing turbulence in the airflow passing through the blade, thereby effectively preventing the blade from vortex-induced vibration.

2. The anti-vibration spoiler device for a wind turbine blade according to claim 1, characterized in that: The first mesh sleeve (1) is sleeved from the maximum chord length position of the blade to the blade tip position.

3. The anti-vibration spoiler device for a wind turbine blade according to claim 2, characterized in that: The first mesh sleeve (1) is sleeved from the 60% position in the blade span direction to the blade tip position.

4. The anti-vibration spoiler device for a wind turbine blade according to claim 1, characterized in that: The spoiler strip (2) forms an angle of 10° to 80° with the chord length direction of the blade.

5. The anti-vibration spoiler device for a wind turbine blade according to claim 1, characterized in that: The spoiler strip (2) is a column with edges and is provided with a plurality of circular through holes (5) for the locking ropes to pass through.

6. The anti-vibration spoiler device for a wind turbine blade according to claim 5, characterized in that: The edge length of the spoiler strip (2) is 20 mm to 2000 mm, and the diameter of the circular through hole (5) is 1 / 50 to 1 / 2 of the edge length.

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