Wind power blade and wind power blade design method

Abstract

The invention relates to the field of power generation, and discloses a wind power blade and a wind power blade design method.The wind power blade comprises a wind power blade body and a spoiler, the spoiler is arranged on the pressure face of the wind power blade body in the length direction in an extending mode, the spoiler has the radial size protruding out of the pressure face, and the radial size of the spoiler is larger than the radial size of the pressure face in the length direction of the spoiler. The radial size H corresponding to at least one cross section of the spoiler and the relative thickness T of the wing section of the wind power blade body with the cross section coplanar meet the relation that H = m * T, m is a constant, and m is larger than 0 and smaller than or equal to 50%. The wind power blade is used for solving the problem that a wind power blade cannot meet the requirement for ideal aerodynamic performance, a spoiler is arranged on the pressure face of a wind power blade body in the length direction of the wind power blade body, and the radial size H corresponding to at least one cross section of the spoiler and the relative thickness T of an airfoil of the wind power blade body with the cross section coplanar meet the relation H = m * T, m is a constant, 0 < m < = 50%, the flowing speed of fluid on the pressure surface can be reduced to the maximum extent, the pressure of the pressure surface is increased to the maximum extent, and then the generating capacity of the wind power blade is increased to the maximum extent.

Description

Technical Field

[0001] The present application relates to the field of power generation, and in particular to a wind turbine blade and a wind turbine blade design method. Background Art

[0002] Wind turbine blades are key components in wind turbines that convert natural wind energy into electrical energy. They convert natural wind into mechanical energy. When natural wind blows over the blades, the blades will feel the power of the wind and begin to rotate, thereby converting wind energy into mechanical energy of the blades, providing energy for subsequent power generation. The shape and angle of the blades can slow down the wind speed, reduce mechanical loads, reduce damage and noise to the wind turbine body, and change the direction of the wind so that wind energy can be better transmitted to components such as generators. The design of the blades will take into account changes in wind speed and mechanical loads. The rotation speed and output power are adjusted by controlling the shape and angle of the blades to ensure the stability and efficiency of the wind turbine.

[0003] With the rapid development of the wind power industry, the trend of large-scale wind turbines is getting faster and faster, especially the rapid development of super-large units such as Shagohuang and Shenyuanhai. As the core component of wind turbines, the length of blades has exceeded 100 meters. In order to meet the structural requirements, the root of the blade often uses a thicker airfoil. However, due to the large operating angle of attack, the root of the blade usually cannot meet the requirements of ideal aerodynamic performance. Summary of the invention

[0004] The embodiments of the present application provide a wind turbine blade and a wind turbine blade design method, which can slow down the flow velocity of the fluid on the pressure surface to the maximum extent, increase the pressure on the pressure surface to the maximum extent, and increase the power generation to the maximum extent.

[0005] In a first aspect, an embodiment of the present application provides a wind turbine blade, comprising: a wind turbine blade body, comprising a blade root portion, a middle portion, a blade tip portion distributed along the length direction of the wind turbine blade body, and a pressure surface spanning the blade root portion, the middle portion and the blade tip portion, the middle portion being disposed between the blade root portion and the blade tip portion; a spoiler, the spoiler extending along the length direction on the pressure surface of the wind turbine blade body, the spoiler having a radial dimension protruding from the pressure surface, and along the length direction of the spoiler, a radial dimension H corresponding to at least one cross section of the spoiler and a relative thickness T of the airfoil of the wind turbine blade body coplanar with the cross section satisfying the relationship H=m*T, where m is a constant, and 0<m≤50%.

[0006] According to the wind turbine blade of the embodiment of the present application, the spoiler includes a first end face and a second end face opposite to each other in the length direction, the first end face is arranged opposite to the blade tip relative to the second end face, the first radial dimension of the first end face protruding from the pressure surface is H1, the first relative thickness of the airfoil of the wind turbine blade body coplanar with the first end face is T1, and the first relative thickness T1 and the first radial dimension H1 satisfy the relationship H=m*T, H1=H, T1=T;

[0007] Along the length direction of the spoiler, the radial dimension of the spoiler protruding from the pressure surface is equal to the first radial dimension.

[0008] According to the wind turbine blade of the embodiment of the present application, the radial dimension of the spoiler protruding from the pressure surface shows a decreasing trend from the first end surface to the second end surface.

[0009] According to the wind turbine blade of the embodiment of the present application, on all cross sections along the length direction of the spoiler, the radial dimension H of the spoiler protruding from the pressure surface and the relative thickness T of the airfoil of the wind turbine blade body which is coplanar with all cross sections, all satisfy the relationship H=m*T, where m is a constant, 0<m≤50%.

[0010] According to the wind turbine blade of the embodiment of the present application, the range of m is 5% to 30%.

[0011] According to the wind turbine blade of the embodiment of the present application, the chord-wise distance between the installation position of the spoiler on the pressure surface and the leading edge of the airfoil with coplanar cross sections is 50% to 100% of the chord length of the airfoil with coplanar cross sections.

[0012] According to the wind turbine blade of the embodiment of the present application, the tangent angle between the spoiler and the pressure surface at the intersection point ranges from 0° to 90°.

[0013] According to the wind turbine blade of the embodiment of the present application, the spoiler is installed in the range from the side of the blade root away from the blade tip to 20% of the main length of the wind turbine blade.

[0014] In a second aspect, an embodiment of the present application further provides a wind turbine blade design method, comprising:

[0015] Determining structural parameters of a wind turbine blade body, wherein the structural parameters include relative thicknesses of each airfoil of the wind turbine blade body along a length direction;

[0016] Determine that the pre-installed spoiler is installed at a preset position on the pressure surface of the wind turbine blade body, wherein the preset position includes a first preset position of the pre-installed spoiler away from a first end surface of the blade tip of the wind turbine blade body;

[0017] Based on the mapping relationship between the design parameters of the pre-installed spoiler and the structural parameters of the wind turbine blade body, the design parameters of the pre-installed spoiler are obtained, the design parameters include a radial dimension H corresponding to at least one cross-section of the spoiler along the length direction of the spoiler, and the mapping relationship includes H=m*T, m is a constant, 0<m≤50%, and T is the relative thickness of the airfoil of the wind turbine blade body that is coplanar with the cross-section.

[0018] According to the wind turbine blade design method of the embodiment of the present application, the design parameters of the pre-installed spoiler are obtained based on the mapping relationship between the design parameters of the pre-installed spoiler and the structural parameters of the wind turbine blade body, and further includes:

[0019] Determining an extension trend of the pre-installed spoiler along the length direction, wherein the extension trend includes that radial dimensions of the pre-installed spoiler along the length direction are equal;

[0020] The mapping relationship between the design parameters of the pre-installed spoiler and the structural parameters of the wind turbine blade body is used to obtain the design parameters of the pre-installed spoiler, wherein the design parameters also include a first radial dimension H1 corresponding to a first end surface of the tip of the spoiler facing away from the wind turbine blade body, and the first radial dimension H1 satisfies the mapping relationship H=m*T, wherein H1=H, T1=T, and T1 is a first relative thickness of the airfoil of the wind turbine blade body coplanar with the first end surface;

[0021] The radial dimension of the spoiler along the length direction is determined to be equal to the first radial dimension H1.

[0022] According to the wind turbine blade design method of the embodiment of the present application, the step of determining that the pre-installed spoiler is installed at a preset position on the pressure surface of the wind turbine blade body further includes:

[0023] Based on the target environment and the structural parameters of the wind turbine blade body, an actual flow velocity and an actual pressure of the fluid on the pressure surface of the wind turbine blade body are obtained;

[0024] Based on the actual flow velocity and the actual pressure, it is determined that the pre-installed spoiler is installed at a preset position on the pressure surface of the wind turbine blade body.

[0025] The wind turbine blade design method according to the embodiment of the present application further includes:

[0026] The value of m is determined based on the target flow velocity and target pressure of the fluid on the pressure surface of the wind turbine blade body.

[0027] The wind turbine blade and wind turbine blade design method of the embodiments of the present application control the flow velocity and pressure of the fluid on the pressure surface by setting a spoiler on the pressure surface of the wind turbine blade body along the length direction of the wind turbine blade body; the radial dimension H corresponding to at least one cross-section of the spoiler and the relative thickness T of the airfoil of the wind turbine blade body coplanar with the cross-section satisfy the relationship H=m*T, m is a constant, 0<m≤50%, so that the spoiler obtained can slow down the flow velocity of the fluid on the pressure surface to the maximum extent, increase the pressure on the pressure surface to the maximum extent, and thereby maximize the power generation of the wind turbine blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0029] Figure 1 This is a schematic diagram of the overall structure of a wind turbine blade in some embodiments of the present application;

[0030] Figure 2 An example is shown Figure 1 A partial enlarged view of the middle B area;

[0031] Figure 3 A partial front view of a wind turbine blade according to some embodiments of the present application;

[0032] Figure 4 A cross-sectional view of a first end surface of some embodiments of the present application;

[0033] Figure 5 Comparison of flow fields of wind turbine blades in some embodiments of this application Figure 1 ;

[0034] Figure 6 Comparison of flow fields of wind turbine blades in some embodiments of this application Figure 2 ;

[0035] Figure 7 This is one of the flow charts of the wind turbine blade design method according to some embodiments of the present application;

[0036] Figure 8 This is the second flowchart of the wind turbine blade design method according to some embodiments of the present application.

[0037] Reference numerals:

[0038] 100: airfoil; 101: leading edge; 102: trailing edge; 103: pressure surface; 200: wind turbine blade body; 210: blade root; 220: middle section; 230: blade tip; 201: spoiler; 202: first end surface; 203: second end surface. DETAILED DESCRIPTION

[0039] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0041] With the rapid development of the wind power industry, the trend of large-scale units is getting faster and faster, especially the rapid development of super-large units such as Shagohuang and Shenyuanhai. As the core component of wind turbines, the length of blades has exceeded 100 meters. In order to meet the structural requirements, the root of the blade often uses a thicker airfoil. However, due to the large operating angle of attack, the root of the blade usually cannot meet the requirements of ideal aerodynamic performance.

[0042] Improving the aerodynamic performance of the blade root is a common concern in the wind power industry. Currently, most methods use flow control to improve the flow field characteristics and enhance the aerodynamic performance of the blade root. Spoilers, as a relatively simple power-enhancing device, have received widespread attention in the industry, and research on the power-enhancing of spoilers is also deepening. However, the existing spoiler design schemes cannot achieve the expected power-enhancing effect on wind turbine blades.

[0043] The present application has conducted multiple tests on spoilers and found that the same spoiler has a better power-increasing effect on wind turbine blades with thicker airfoils than on wind turbine blades with thinner airfoils, thus finding the correlation between the thickness of the airfoil and the spoiler. In addition, based on the fact that the downwash effect of the fluid on the wind turbine blade is affected by the radial dimension of the spoiler protruding from the surface of the wind turbine blade, in order to make the spoiler effectively reduce the downwash effect, the radial dimension of the spoiler protruding from the surface of the wind turbine blade is associated with the thickness of the wind turbine blade airfoil, thereby obtaining the spoiler with the best power-increasing effect and the wind turbine blade with the largest power generation.

[0044] Glossary:

[0045] Blade root 210: the part of the wind wheel that connects the blades and the hub, which has two forms: a pre-embedded structure and a drilled structure.

[0046] Blade tip 230: the portion of the blade farthest from the wind energy rotation axis, also considered to be the end in the length direction of the wind turbine blade (arranged relative to the blade root 210).

[0047] Leading edge 101: the frontmost portion of the airfoil 100 of the blade in the direction of rotation.

[0048] Trailing edge 102: the rearmost end of the blade airfoil 100 in the direction of rotation.

[0049] Pressure side 103: The side of the blade facing the wind, or windward side - PS.

[0050] Suction side: The side of the blade facing away from the wind, or called the leeward side - SS.

[0051] Chord length of airfoil 100: The chord length is the straight-line distance between the leading edge 101 and the trailing edge 102 of the airfoil 100.

[0052] Airfoil 100 thickness: refers to the diameter of the inscribed circle of the airfoil 100 circumference, which can also be regarded as the distance between the upper and lower surfaces measured perpendicular to the chord line.

[0053] Relative thickness: is the ratio of the thickness of the airfoil 100 to the chord length, and is used to describe the thickness of the airfoil 100.

[0054] In order to solve the problems in the prior art, the embodiments of the present application provide a wind turbine blade and a wind turbine blade design method. The wind turbine blade provided by the embodiments of the present application is first introduced below.

[0055] Figure 1 A schematic diagram showing the overall structure of a wind turbine blade in some embodiments of the present application is shown; Figure 2 An example is shown Figure 1 A partial enlarged view of the middle B area; Figure 3 A partial front view of a wind turbine blade according to some embodiments of the present application is shown; Figure 4A cross-sectional view of the first end surface 202 according to some embodiments of the present application is shown.

[0056] like Figures 1 to 4 As shown, an embodiment of the present application provides a wind turbine blade, comprising: a wind turbine blade body 200 and a spoiler 201, the wind turbine blade body 200 comprising a blade root portion 210, a middle portion 220, a blade tip portion 230 distributed along its own length direction, and a pressure surface 103 spanning the blade root portion 210, the middle portion 220 and the blade tip portion 230, the middle portion 220 being arranged between the blade root portion 210 and the blade tip portion 230; the spoiler 201 is extended along the length direction on the pressure surface 103 of the wind turbine blade body 200, the spoiler 201 has a radial dimension protruding from the pressure surface 103, and along the length direction of the spoiler 201, the radial dimension H corresponding to at least one cross section of the spoiler 201 and the relative thickness T of the airfoil 100 of the wind turbine blade body 200 coplanar with the cross section satisfy the relationship H=m*T, m is a constant, 0<m≤50%.

[0057] For example, the spoiler 201 is in the shape of a rectangular parallelepiped, and the spoiler 201 includes a length, a width and a thickness. The length direction of the spoiler 201 is consistent with the length direction of the wind turbine blade body 200, that is, the spoiler 201 is installed on the pressure surface 103 along the side of the length direction. The spoiler 201 can directly contact the pressure surface 103 of the wind turbine blade body 200, or a mounting seat can be set, and the spoiler 201 is connected to the pressure surface 103 through the mounting seat. The width direction of the spoiler 201 corresponds to the radial direction in which the spoiler 201 protrudes from the pressure surface 103, and the width of the spoiler 201 is the radial dimension of the spoiler 201 protruding from the pressure surface 103. In the present application, the thickness of the spoiler 201 can be equal or unequal along the length direction, and the thickness of the spoiler 201 is as small as possible to reduce the weight, thereby reducing the load of the spoiler 201 on the wind turbine blade. Of course, in other embodiments of the present application, the spoiler 201 can also be columnar or other irregular shapes.

[0058] In one embodiment of the present application, the spoiler 201 includes a first end face 202 and a second end face 203 opposite to each other in the length direction, the first end face 202 is arranged relative to the second end face 203 and facing away from the blade tip 230, the first radial dimension of the first end face 202 protruding from the pressure surface 103 is H1, the first relative thickness of the airfoil 100 of the wind turbine blade body 200 coplanar with the first end face 202 is T1, and the first relative thickness T1 and the first radial dimension H1 satisfy the relationship H=m*T, H1=H, T1=T; along the length direction of the spoiler 201, the radial dimension of the spoiler 201 protruding from the pressure surface 103 is equal to the first radial dimension.

[0059] The first end surface 202 of the spoiler 201 is close to the blade root 210, and the second end surface 203 is close to the blade tip 230. The first end surface 202 can be a straight surface. The straight first end surface 202 extends and cuts the wind turbine blade body 200 to obtain the corresponding cross-sectional airfoil 100, such as Figure 4 The first relative thickness T1 of the airfoil 100 with coplanar cross sections is calculated by using the chord length C of the airfoil 100 and the thickness W of the airfoil 100 with coplanar cross sections.

[0060] In order to obtain the best power-increasing effect of the spoiler 201, in one embodiment of the present application, when the spoiler 201 is of equal width, the first radial dimension corresponding to the first end face 202 is used as the overall radial dimension of the spoiler 201. Based on the first relative thickness T1 and the first radial dimension H1 satisfying the relationship H1=m*T1, m is a constant, 0<m≤50%. The first radial dimension H1 is obtained, and then the overall radial dimension of the spoiler 201 of equal width is obtained as H1. In other words, along the length direction of the spoiler 201, the radial dimension of the spoiler 201 protruding from the pressure surface 103 is equal to the first radial dimension H1.

[0061] Furthermore, in order to further optimize the structure of the spoiler 201, the weight of the spoiler 201 is reduced while ensuring the power enhancement effect. Figure 2 As shown, in one embodiment of the present application, the radial dimension of the spoiler 201 protruding from the pressure surface 103 decreases from the first end surface 202 to the second end surface 203 .

[0062] The above calculation results in the first radial dimension H1 of the first end face 202. The first radial dimension H1 is taken as the maximum radial dimension, and the radial dimension is gradually reduced toward the second end face 203, so as to obtain a spoiler 201 with a gradually decreasing radial dimension along the length direction.

[0063] For example, based on the relationship between the first relative thickness T1 and the first radial dimension H1, H1=m*T1, m is a constant, 0<m≤50%. Further, the relationship between the second relative thickness T2 of the second airfoil 100 coplanar with the second end surface 203 and the second radial dimension H2 corresponding to the second end surface 203 is obtained, that is, H2=m*T2, m is a constant, 0<m≤50%; the second radial dimension H2 is obtained. Thus, along the length direction, a spoiler 201 with a smooth transition from the first radial dimension H1 to the second radial dimension H2 is obtained.

[0064] In addition, in order to slow down the flow velocity of the fluid on the pressure surface 103 to the maximum extent and increase the pressure of the pressure surface 103 to the maximum extent, in other embodiments of the present application, on all cross sections along the length direction of the spoiler 201, the radial dimension H of the spoiler 201 protruding from the pressure surface 103 and the relative thickness T of the airfoil 100 of the wind turbine blade body 200 that are coplanar with all cross sections satisfy the relationship H=m*T, m is a constant, 0<m≤50%.

[0065] That is, each radial dimension of the spoiler 201 along the length direction and the relative thickness of the airfoil 100 with the same cross section all satisfy the relationship H=m*T, m is a constant, 0<m≤50%, thereby obtaining a spoiler 201 based on the relative thickness of the airfoil 100 at each location of the wind turbine blade body 200.

[0066] Figure 5 Comparison of flow fields of wind turbine blades in some embodiments of this application Figure 1 , wherein the radial dimension H of the spoiler 201 is 20% t; Figure 6 Comparison of the flow field of conventional spoiler 201 wind turbine blade in the prior art Figure 2 .

[0067] like Figure 5 and Figure 6 As shown, when the pressure surface 103 is installed with the spoiler 201 of the specified radial size in the above embodiment, the existence of the spoiler 201 of the present application can significantly increase the pressure in the upstream area of ​​the spoiler 201 compared to the airfoil 100 of the conventional spoiler 201. The closer the flow field is to the spoiler 201, the more obvious the pressure increase is. At the same time, the negative pressure area of ​​the suction surface will be more obvious, which will directly lead to a significant increase in the lift coefficient. In addition, the spoiler 201 of the present application will also strengthen the downwash effect on the fluid of the pressure surface 103 and separate the flow in advance, forming a larger separation zone. The flow field at this time can be equivalent to a flow field of a large thickness and large blunt trailing edge airfoil 100 with a larger effective curvature. The fluid forms a plate vortex behind the spoiler 201, and induces a secondary vortex at the angle between the spoiler 201 and the pressure surface 103. The secondary vortex slows down the flow velocity of the fluid on the pressure surface 103 to the maximum extent, and increases the pressure of the pressure surface 103 to the maximum extent, thereby achieving the best power generation effect.

[0068] In an optional embodiment of the present application, m ranges from 5% to 30%. The present application simulates a wind turbine blade with a value of m in the range of 0 to 50%, and finds that when m is in the range of 5% to 30%, the wind turbine blade has a good power generation, and compared with a wind turbine blade without a spoiler 201, the power generation increase rate is in a considerable range. The key values ​​of m in the range of 5% to 30% and the corresponding power generation increase rate are shown in Table 1. From the data in the table, it can be seen that the power generation of the wind turbine blade equipped with the spoiler 201 of the present application has the maximum power generation increase rate of 0.178% when the radial dimension of the spoiler 201 is 10%t.

[0069] Table 1

[0070] Spoiler radial dimension h No spoiler 7％t 10％t 20％t 30％t Power generation rate 0 0.17％ 0.178％ 0.123％ 0.063％

[0071] In order to further optimize the relative position relationship between the spoiler 201 and the wind turbine blade body 200, in a specific embodiment of the present application, as shown in FIG. Figure 4 As shown, the chord-wise distance between the installation position of the spoiler 201 on the pressure surface 103 and the leading edge 101 of the airfoil 100 with coplanar cross sections is 50% to 100% of the chord length of the airfoil 100 with coplanar cross sections.

[0072] Taking the cross section of the airfoil 100 with coplanar cross sections as an example, the first end surface 202 of the spoiler 201 and the pressure surface 103 have an intersection, and the horizontal distance between the intersection and the leading edge 101, that is, the chord-wise distance, is X, X=50%-100%C, where C is the chord length between the trailing edge 102 and the leading edge 101.

[0073] In addition, in one embodiment of the present application, the tangent angle of the spoiler 201 and the pressure surface 103 through the intersection point ranges from 0° to 90°. Specifically, the tangent angle of the intersection point of the first end surface 202 and the airfoil 100 ranges from 0° to 90°. Of course, in other embodiments of the present application, the tangent angle of the spoiler 201 and the pressure surface 103 through the intersection point ranges from 90° to 180°.

[0074] Further limiting the position of the spoiler 201 on the pressure surface 103, in the embodiment of the present application, as Figure 3 As shown, the spoiler 201 is installed in the range from the side of the blade root portion 210 away from the blade tip portion 230 to 20% of the length L of the wind turbine blade.

[0075] Specifically, the spoiler 201 is installed on the blade root 210 and the middle section 220, and the spoiler 201 is installed within the range of 20% of the wind turbine blade length L along the length direction of the wind turbine blade body 200, with the side of the blade root 210 away from the blade tip 230 as the starting point. For example, the first end surface 202 of the spoiler 201 is flush with the side of the blade root 210 away from the blade tip 230, the length range of the spoiler 201 is within the range of 20%L, and the length of the spoiler 201 can be equal to 20%L.

[0076] Of course, in other embodiments of the present application, the first end surface 202 of the spoiler 201 can be placed at any position of the blade root 210 and the middle section 220. The spoiler 201 can be a continuous structure or a discontinuous structure, that is, the spoiler 201 can include multiple sections, and the multiple sections of the spoiler 201 are arranged at intervals within the range of 20% L. Of course, the spoiler 201 can also be provided with structures such as grooves and holes as needed.

[0077] Figure 7 One of the flow charts of the wind turbine blade design method according to some embodiments of the present application is shown.

[0078] like Figure 7 As shown, in an embodiment of the present application, a method for designing a wind turbine blade includes:

[0079] S1: Determine the structural parameters of the wind turbine blade body 200, the structural parameters include the relative thickness of each airfoil 100 along the length direction of the wind turbine blade body 200; of course, the relative thickness of each airfoil 100 can be obtained directly or indirectly, for example, the chord length and maximum thickness of each airfoil 100 included in the structural parameters, thereby calculating the relative thickness; or other parameters can be used to calculate the relative thickness of the airfoil 100. Of course, the structural parameters of the wind turbine blade body 200 can also include length, etc.

[0080] The structural parameters of the wind turbine blade body 200 can be determined by the target environment and the power generation demand. Of course, in the wind turbine blade of the present application, a wind turbine blade body 200 with determined structural parameters or an existing wind turbine blade body 200 can be selected.

[0081] S2: Determine a preset position where the pre-installed spoiler 201 is installed on the pressure surface 103 of the wind turbine blade body 200 .

[0082] For example, the preset position includes a first preset position of the pre-installed spoiler 201 away from the first end surface 202 of the tip portion 230 of the wind turbine blade body 200; wherein the preset position includes the position of the pre-installed spoiler 201 along the length direction of the wind turbine blade, and the installation angle of the pre-installed spoiler 201.

[0083] S3: Based on the mapping relationship between the design parameters of the pre-installed spoiler 201 and the structural parameters of the wind turbine blade body 200, the design parameters of the pre-installed spoiler 201 are obtained, and the design parameters include a radial dimension H corresponding to at least one cross section of the spoiler 201 along the length direction of the spoiler 201, and the mapping relationship includes H=m*T, m is a constant, 0<m≤50%, and T is the relative thickness of the airfoil 100 of the wind turbine blade body 200 that is coplanar with the cross section.

[0084] Of course, for the design parameters of the pre-installed spoiler 201, first, the structural shape of the pre-installed spoiler 201 is selected, for example, a rectangular parallelepiped; second, the radial dimension variation trend of the pre-installed spoiler 201 along the length direction is determined, for example, along the length direction, the radial dimensions of the pre-installed spoiler 201 are equal, or, along the length direction, the radial dimensions of the pre-installed spoiler 201 are continuously reduced. Finally, the radial dimensions of the pre-installed spoiler 201 are obtained based on the mapping relationship.

[0085] After determining the design parameters of the pre-installed spoiler 201 and the structural parameters of the wind turbine blade body 200, complete wind turbine blade parameters can be obtained, and the wind turbine blade design is completed.

[0086] In addition, in some optional embodiments of the present application, the design parameters of the pre-installed spoiler 201 are obtained based on the mapping relationship between the design parameters of the pre-installed spoiler 201 and the structural parameters of the wind turbine blade body 200 in step S3, and further include:

[0087] Determining an extension trend of the pre-installed spoiler 201 along the length direction, wherein the extension trend includes that radial dimensions of the pre-installed spoiler 201 along the length direction are equal;

[0088] Based on the mapping relationship between the design parameters of the pre-installed spoiler 201 and the structural parameters of the wind turbine blade body 200, the design parameters of the pre-installed spoiler 201 are obtained, and the design parameters also include a first radial dimension H1 corresponding to the first end surface 202 of the tip portion 230 of the spoiler 201 facing away from the wind turbine blade body 200, and the first radial dimension H1 satisfies the mapping relationship H=m*T, wherein H1=H, T1=T, and T1 is a first relative thickness of the airfoil 100 of the wind turbine blade body 200 coplanar with the first end surface 202;

[0089] The radial dimension of the spoiler 201 along the length direction is determined to be equal to the first radial dimension H1.

[0090] For example, in other embodiments, the extension trend of the pre-installed spoiler 201 along the length direction is that the radial dimension continuously decreases from the first end face 202 to the second end face 203. In the embodiment of the present application, when it is determined that the radial dimension change trend of the pre-installed spoiler 201 along the length direction is that the radial dimension of the pre-installed spoiler 201 continuously decreases along the length direction, the radial dimension of each part of the pre-installed spoiler 201 can be obtained by using a mapping relationship.

[0091] Figure 8 The second flowchart shows the wind turbine blade design method according to some embodiments of the present application.

[0092] like Figure 8 As shown, in other embodiments of the present application, it is determined that the pre-installed spoiler 201 is installed at a preset position on the pressure surface 103 of the wind turbine blade body 200, and the wind turbine blade design method further includes:

[0093] S21: Based on the target environment and the structural parameters of the wind turbine blade body 200, the actual flow velocity and actual pressure of the fluid on the pressure surface 103 of the wind turbine blade body 200 are obtained; for example, in the simulation software, the structural parameters of the wind turbine blade body 200 are input to establish a three-dimensional model of the wind turbine blade body 200; the target environment, such as altitude, pressure, wind force, temperature, humidity and other parameters, are input into the simulation software to simulate the working conditions of the wind turbine blade body 200 in the target environment, so as to obtain the actual flow velocity and actual pressure of the fluid on the pressure surface 103 of the wind turbine blade body 200.

[0094] Of course, it is also possible to perform field measurements on the wind turbine blade body 200 installed in the target environment to measure the actual flow velocity and actual pressure of the fluid on the pressure surface 103 of the wind turbine blade body 200 .

[0095] S22: Based on the actual flow velocity and the actual pressure, determine the preset position of the pre-installed spoiler 201 installed on the pressure surface 103 of the wind turbine blade body 200. For example, based on the actual flow velocity and the actual pressure, adjust the preset position of the wind turbine blade body 200 so that the pressure surface 103 of the wind turbine blade reaches the target flow velocity and the target pressure, so that the power generation of the wind turbine blade reaches or exceeds the preset power generation.

[0096] Specifically, in the embodiment of the present application, the wind turbine blade design method, after step S3, further includes:

[0097] The value of m is determined based on the target flow velocity and target pressure of the fluid on the pressure surface 103 of the wind turbine blade body 200 .

[0098] That is to say, based on the mapping relationship, the design parameters of multiple spoilers 201, for example, multiple first radial dimensions, can be obtained. Then, according to the target flow velocity and target pressure of the fluid on the pressure surface 103 of the wind turbine blade body 200, a suitable first radial dimension, that is, a suitable m value, is further selected. For example, when m is equal to 5% to 30%, the target fluid velocity and target pressure can be achieved, and the power generation of each m value can be further calculated, and the m value with the largest power generation is selected as the optimal value of the first radial dimension.

[0099] The wind turbine blade and wind turbine blade design method of the embodiment of the present application are provided with a spoiler 201 on the pressure surface 103 of the wind turbine blade body 200 along the length direction of the wind turbine blade body 200 to control the flow velocity and pressure of the fluid on the pressure surface 103; the radial dimension H corresponding to at least one cross section of the spoiler 201 and the relative thickness T of the airfoil 100 of the wind turbine blade body 200 coplanar with the cross section satisfy the relationship H=m*T, m is a constant, 0<m≤50%, so that the spoiler 201 obtained can slow down the flow velocity of the fluid on the pressure surface 103 to the maximum extent, increase the pressure of the pressure surface 103 to the maximum extent, and thus maximize the power generation of the wind turbine blade.

[0100] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A wind turbine blade, characterized in that: include: A wind turbine blade body (200), comprising a blade root portion (210), a middle portion (220), a blade tip portion (230) distributed along the length direction of the blade, and a pressure surface (103) spanning the blade root portion (210), the middle portion (220), and the blade tip portion (230), wherein the middle portion (220) is disposed between the blade root portion (210) and the blade tip portion (230); A spoiler (201), the spoiler (201) being arranged to extend along the length direction of the pressure surface (103) of the wind turbine blade body (200), the spoiler (201) having a radial dimension protruding from the pressure surface (103), and along the length direction of the spoiler (201), a radial dimension H corresponding to at least one cross section of the spoiler (201) and a relative thickness T of the airfoil (100) of the wind turbine blade body (200) coplanar with the cross section, satisfying the relationship H=m*T, where m is a constant and 0<m≤50%.

2. The wind turbine blade according to claim 1, characterized in that: The spoiler (201) comprises a first end face (202) and a second end face (203) which are opposite to each other in the length direction; the first end face (202) is arranged opposite to the blade tip (230) relative to the second end face (203); a first radial dimension of the first end face (202) protruding from the pressure surface (103) is H1; a first relative thickness of the airfoil (100) of the wind turbine blade body (200) coplanar with the first end face (202) is T1; the first relative thickness T1 and the first radial dimension H1 satisfy the relationship H=m*T, H1=H, T1=T; Along the length direction of the spoiler (201), the radial dimension of the spoiler (201) protruding from the pressure surface (103) is equal to the first radial dimension.

3. The wind turbine blade according to claim 2, characterized in that: In a direction from the first end surface (202) to the second end surface (203), a radial dimension of the spoiler (201) protruding from the pressure surface (103) shows a decreasing trend.

4. The wind turbine blade according to claim 1, characterized in that: On all cross sections along the length direction of the spoiler (201), the radial dimension H of the spoiler (201) protruding from the pressure surface (103) and the relative thickness T of the airfoil (100) of the wind turbine blade body (200) that are coplanar with all cross sections satisfy the relationship H=m*T, where m is a constant and 0<m≤50%.

5. The wind turbine blade according to claim 1, characterized in that: m ranges from 5% to 30%.

6. The wind turbine blade according to claim 1, characterized in that: The chord-wise distance between the installation position of the spoiler (201) on the pressure surface (103) and the leading edge (101) of the airfoil (100) with coplanar cross sections is 50% to 100% of the chord length of the airfoil (100) with coplanar cross sections.

7. The wind turbine blade according to claim 1, characterized in that: The range of the included angle of the tangent line between the spoiler (201) and the pressure surface (103) through the intersection point is 0° to 90°.

8. The wind turbine blade according to any one of claims 1 to 7, characterized in that: The spoiler (201) is installed in a range from a side of the blade root (210) away from the blade tip (230) to 20% of the main length of the wind turbine blade.

9. A wind turbine blade design method, characterized in that: include: Determining structural parameters of a wind turbine blade body (200), wherein the structural parameters include relative thicknesses of each airfoil (100) of the wind turbine blade body (200) along a length direction; Determining a preset position at which a pre-installed spoiler (201) is installed on a pressure surface (103) of the wind turbine blade body (200); Based on a mapping relationship between the design parameters of the pre-installed spoiler (201) and the structural parameters of the wind turbine blade body (200), the design parameters of the pre-installed spoiler (201) are obtained, the design parameters including a radial dimension H corresponding to at least one cross section of the spoiler (201) along the length direction of the spoiler (201), the mapping relationship including H=m*T, m is a constant, 0<m≤50%, wherein T is the relative thickness of the airfoil (100) of the wind turbine blade body (200) coplanar with the cross section.

10. The wind turbine blade design method according to claim 9, characterized in that: The method of obtaining the design parameters of the pre-installed spoiler (201) based on the mapping relationship between the design parameters of the pre-installed spoiler (201) and the structural parameters of the wind turbine blade body (200) further includes: Determining an extension trend of the pre-installed spoiler (201) along the length direction, wherein the extension trend includes that radial dimensions of the pre-installed spoiler (201) along the length direction are equal; The design parameters of the pre-installed spoiler (201) are obtained based on the mapping relationship between the design parameters of the pre-installed spoiler (201) and the structural parameters of the wind turbine blade body (200), wherein the design parameters also include a first radial dimension H1 corresponding to a first end surface (202) of the tip portion (230) of the spoiler (201) facing away from the wind turbine blade body (200), and the first radial dimension H1 satisfies the mapping relationship H=m*T, wherein H1=H, T1=T, and T1 is a first relative thickness of the airfoil (100) of the wind turbine blade body (200) coplanar with the first end surface (202); The radial dimension of the spoiler (201) along the length direction is determined to be equal to the first radial dimension H1.

11. The wind turbine blade design method according to claim 9, characterized in that: The step of determining that the pre-installed spoiler (201) is installed at a preset position on the pressure surface (103) of the wind turbine blade body (200) further comprises: Based on the target environment and the structural parameters of the wind turbine blade body (200), the actual flow velocity and the actual pressure of the fluid on the pressure surface (103) of the wind turbine blade body (200) are obtained; Based on the actual flow velocity and the actual pressure, a preset position at which the pre-installed spoiler (201) is installed on the pressure surface (103) of the wind turbine blade body (200) is determined.

12. The wind turbine blade design method according to any one of claims 9 to 11, characterized in that: Also includes: The value of m is determined based on the target flow velocity and target pressure of the fluid on the pressure surface (103) of the wind turbine blade body (200).

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