A fan blade and a fan

Abstract

This disclosure provides a wind turbine blade and a wind turbine. The wind turbine blade includes a wind turbine blade body and a Green flap. The Green flap is disposed along the length of the wind turbine blade body at the end of the wind turbine blade body and connected to the trailing edge of the wind turbine blade body. The Green flap includes a first wing plate that conforms to the suction surface of the wind turbine blade body and a second wing plate that bends and extends from the first wing plate. The edge of the second wing plate away from the first wing plate has a serrated trailing edge. The configuration of the Green flap and the load and airfoil size of the wind turbine blade body satisfy the following expression: where ρ is the air density, v is the wind speed, R is the length of the wind turbine blade body, η is the wind energy conversion efficiency, a is the width of the first wing plate, and b is the width of the second wing plate.

Description

Technical Field

[0001] The embodiments disclosed herein belong to the technical field of wind power generation equipment, specifically relating to a wind turbine blade and a wind turbine. Background Technology

[0002] Poor aerodynamic design of the blades results in low energy conversion efficiency and inability to fully utilize wind power. The relatively simple blade structure fails to consider complex airflow and load conditions, potentially leading to poor performance and structural damage at high wind speeds. Furthermore, current wind turbine blades lack adaptability to changes in wind speed and direction, and cannot achieve optimal power output and load management. Moreover, wind turbines using the aforementioned blade technologies cannot improve the lift-to-drag ratio or the power generation of the turbine unit.

[0003] Therefore, how to solve the above problems has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] The embodiments disclosed herein are intended to at least solve one of the technical problems existing in the prior art, and to provide a wind turbine blade and a wind turbine.

[0005] One aspect of the embodiments of this disclosure provides a wind turbine blade, including: a wind turbine blade body and a Green flap, wherein the Green flap is disposed along the length direction of the wind turbine blade body at the end of the wind turbine blade body and connected to the trailing edge of the wind turbine blade body;

[0006] The Green flap includes a first wing plate that conforms to the suction surface of the wind turbine blade body, and a second wing plate that bends and extends from the first wing plate; wherein the edge of the second wing plate away from the first wing plate has a serrated tail edge.

[0007] The Green flap configuration and the load and airfoil dimensions of the wind turbine blade body satisfy the following expression: In the formula, ρ is the air density, v is the wind speed, R is the length of the wind turbine blade, η is the wind energy conversion efficiency, a is the width of the first wing, and b is the width of the second wing.

[0008] Optionally, the installation position of the Green flap and the airfoil size of the wind turbine blade body also satisfy the expression: R2=kR, where R2 is the height of the tip of the Green flap from the root of the wind turbine blade body, and k is a proportionality coefficient;

[0009] And the conditional expression: R1 = mR, where R1 is the height of the Green flap root from the root of the wind turbine blade body, and m is the proportionality coefficient.

[0010] Optionally, the serrated trailing edge is set at an angle to the airfoil chord of the wind turbine blade body.

[0011] Optionally, the serrated trailing edge is at a 90° angle to the airfoil chord of the wind turbine blade body.

[0012] ° Angle setting.

[0013] Optionally, the first wing plate is bonded to the suction surface of the fan blade body using an adhesive pressure-holding method.

[0014] A second aspect of the embodiments of this disclosure provides a fan, including the fan blades described above.

[0015] The beneficial effects of the embodiments of this disclosure include:

[0016] In this invention, the above-mentioned design scheme can improve aerodynamic performance, increase lift, and reduce drag, significantly increasing the unit's power generation. Furthermore, by designing Green flaps and setting serrated trailing edges, the intensity of blade tip vortices can be reduced, decreasing energy loss caused by vortices. Reducing tip vortices lowers the load on the airfoil structure and extends the airfoil's service life. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a fan according to an embodiment of the present disclosure, wherein the fan blade body is indicated by the dashed box B.

[0018] Figure 2 for Figure 1 A schematic diagram of the wind turbine blade body at point B in the middle, showing the distance R2 from the tip of the Green flap to the root of the wind turbine blade body, the distance R1 from the root of the Green flap to the root of the wind turbine blade body, the length H of the Green flap, and the length R of the wind turbine blade body.

[0019] Figure 3 for Figure 2 A cross-sectional diagram of the wind turbine blade body along section AA, showing the airfoil chord C, suction surface, and the positional relationship between the Green flap at the circle and the wind turbine blade body during installation.

[0020] Figure 4 This is a schematic diagram of the structure of the Green flap disclosed herein.

[0021] In the diagram, 100 is the wind turbine; 1 is the wind turbine blade body; 2 is the Green flap; 11 is the suction surface; 21 is the first wing plate; 22 is the second wing plate; and 221 is the serrated trailing edge. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The detailed descriptions and accompanying drawings of the following embodiments are used to exemplarily illustrate the principles of this application, but should not be used to limit the scope of this application; that is, this application is not limited to the described embodiments. In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0024] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0025] like Figure 1-4 As shown, a wind turbine blade includes a wind turbine blade body 1 and a Green flap 2. The Green flap 2 is arranged along the length direction of the wind turbine blade body 1 at the end of the wind turbine blade body 1 and connected to the trailing edge of the wind turbine blade body 1.

[0026] The Green flap 2 includes a first airfoil 21 that conforms to the suction side 11 of the wind turbine blade body 1, and a second airfoil 22 that extends and bends from the first airfoil 21, wherein the edge of the second airfoil 22 away from the first airfoil 21 has a serrated trailing edge 221. It can be understood that the suction side, in wind turbine blades or other airfoil structures, refers to the side where the airflow velocity is higher and the pressure is lower when the airflow passes over the blade. When the airflow passes over the wind turbine blade, due to the shape of the blade (usually an airfoil), the airflow velocity increases and the pressure decreases on the upper surface (suction side) of the blade, while the velocity decreases and the pressure increases on the lower surface (pressure side) of the blade.

[0027] The Green flap 2 configuration and the load and airfoil dimensions of the wind turbine blade body 1 satisfy the following expression: In the formula, ρ is the air density, v is the wind speed, R is the length of the wind turbine blade body 1, η is the wind energy conversion efficiency, a is the width of the first wing plate 21, and b is the width of the second wing plate 22.

[0028] In this invention, the above-mentioned design scheme can improve aerodynamic performance, increase lift, and reduce drag, significantly increasing the unit's power generation. Furthermore, by designing the Green flap 2 and setting the serrated trailing edge 221, the intensity of the blade tip vortex can be reduced, lowering energy loss caused by the vortex. By reducing the blade tip vortex, the load on the airfoil structure is reduced, extending the airfoil's service life.

[0029] In some embodiments, the Green flap 2 is arranged at or near the trailing edge of the wind turbine blade body 1, and is arranged along the length direction of the blade body. Further, the serrated trailing edge 221 includes a plurality of serrations along the length direction of the Green flap 2 and disposed on the trailing edge of the second wing plate 22.

[0030] In some embodiments, the outlines of the first wing plate 21 and the second wing plate 22 are both rectangular plates.

[0031] refer to Figure 2 In some embodiments, the installation position of the Green flap 2 and the airfoil size of the wind turbine blade body 1 also satisfy the expression: R2 = kR, where R2 is the height of the tip of the Green flap 2 from the root of the wind turbine blade body 1, and k is a proportionality coefficient.

[0032] And the expression: R1 = mR, where R1 is the height of the root of the Green flap 2 from the root of the wind turbine blade body 1, and m is the proportionality coefficient. It can be understood that the length H of the Green flap 2 can be determined by the expressions R2 = kR and R1 = mR.

[0033] In this invention, by relating the tip height R2 and root height R1 of the Green flap 2 to the length R of the wind turbine blade body using proportional coefficients k and m, the installation position of the Green flap 2 on the wind turbine blade body 1 can be determined, and the dimensions (wing length H) of the Green flap 2 can be matched with the overall dimensions of the wind turbine blade body 1, thereby optimizing aerodynamic performance. This design helps to improve the lift-to-drag ratio of the blade, reduce drag, and improve wind energy conversion efficiency. Furthermore, the proportionality between the tip height R2 and root height R1 of the Green flap 2 and the length R of the wind turbine blade body 1 ensures that the Green flap 2 is evenly distributed on the blade, avoiding localized stress concentration caused by dimensional mismatch, which helps to improve the overall structural stability of the blade and extend its service life.

[0034] In some embodiments, the serrated trailing edge 221 is set at an angle to the airfoil chord of the wind turbine blade body 1.

[0035] In this invention, the serrated trailing edge 221 is set at an angle to the airfoil chord, which can effectively change the flow characteristics of the airflow at the trailing edge of the blade, reduce the generation of turbulence and eddies, and this design helps to improve the lift-to-drag ratio of the blade and reduce drag, thereby improving the wind energy conversion efficiency.

[0036] In some embodiments, the serrated trailing edge 221 is set at a 90° angle to the airfoil chord of the wind turbine blade body 1.

[0037] In this invention, the serrated trailing edge 221 is set at a 90° angle to the airfoil chord, which can maximize the dispersion of trailing edge vortices, reduce turbulence and energy loss. This design helps to improve the lift-to-drag ratio of the blade and reduce drag, thereby improving wind energy conversion efficiency.

[0038] In some embodiments, the first wing plate 21 is bonded to the suction surface 11 of the fan blade body 1 by adhesive pressure bonding.

[0039] In this invention, the adhesive bonding and pressure-holding method ensures a tight fit between the first wing plate 21 and the suction surface 11 of the wind turbine blade body 1, preventing loosening or detachment due to vibration or wind load. This design improves the installation stability of the Green flap 2 and ensures its reliability during long-term operation. The adhesive bonding and pressure-holding method also evenly distributes the stress between the first wing plate 21 and the wind turbine blade body 1, avoiding localized stress concentration, which helps improve the structural strength of the blade and extend its service life.

[0040] refer to Figure 1 A second aspect of the embodiments of this disclosure is to provide a wind turbine, including the wind turbine blades described above. Specifically, the wind turbine blades of this disclosure are ultra-long blades for large-capacity wind turbine units, used for rapid load reduction.

[0041] A third aspect of the embodiments of this disclosure provides a method for processing wind turbine blades, comprising:

[0042] Step 1: Grind the suction surface of the fan blades until smooth.

[0043] Step 2: Grind the mounting surface of the Green flap and install the mounting surface to the suction surface of the fan blade body by adhesive bonding and pressure holding.

[0044] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A wind turbine blade, characterized in that, include: The wind turbine blade body and the Green flap, wherein the Green flap is arranged along the length direction of the wind turbine blade body at the end of the wind turbine blade body and connected to the trailing edge of the wind turbine blade body; The Green flap includes a first wing plate that conforms to the suction surface of the wind turbine blade body, and a second wing plate that bends and extends from the first wing plate; wherein the edge of the second wing plate away from the first wing plate has a serrated tail edge. The Green flap configuration and the load and airfoil dimensions of the wind turbine blade body satisfy the following expression: In the formula, ρ is the air density, v is the wind speed, R is the length of the wind turbine blade, η is the wind energy conversion efficiency, a is the width of the first wing, and b is the width of the second wing.

2. The wind turbine blade according to claim 1, characterized in that, The installation position of the Green flap and the airfoil size of the wind turbine blade body also satisfy the expression: R2=kR, where R2 is the height of the tip of the Green flap from the root of the wind turbine blade body, and k is a proportionality coefficient. And the expression: R1=mR, where R1 is the height of the Green flap root from the root of the wind turbine blade body, and m is the proportionality coefficient.

3. The wind turbine blade according to claim 1, characterized in that, The serrated trailing edge is set at an angle to the airfoil chord of the wind turbine blade body.

4. The wind turbine blade according to claim 3, characterized in that, The serrated trailing edge is set at a 90° angle to the airfoil chord of the wind turbine blade body.

5. The wind turbine blade according to claim 1, characterized in that, The first wing plate is bonded to the suction surface of the fan blade body using an adhesive pressure-holding method.

6. A fan, characterized in that, Includes the wind turbine blades as described in any one of claims 1-5.

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