Wind turbine blades and wind turbine blade design methods

Abstract

This application relates to the field of power generation and discloses a wind turbine blade and a wind turbine blade design method. The wind turbine blade includes a blade body and a spoiler. The spoiler extends along the length of the pressure surface of the blade body and has a radial dimension protruding from the pressure surface. Along the length of the spoiler, 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, where m is a constant and 0 < m ≤ 50%. This design addresses the problem of wind turbine blades failing to meet ideal aerodynamic performance requirements. By placing a spoiler along the length of the blade body on the pressure surface, ensuring that 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, where m is a constant and 0 < m ≤ 50%, the design maximizes the reduction of fluid flow velocity on the pressure surface, maximizes the increase in pressure on the pressure surface, and thus maximizes the power generation of the wind turbine blade.

Description

Technical Field

[0001] This application belongs to the field of power generation, and in particular relates to a wind turbine blade and a wind turbine blade design method. Background Technology

[0002] Wind turbine blades are key components in wind turbine generators that convert natural wind energy into electrical energy. They transform natural wind energy into mechanical energy. When wind blows across the blades, the blades sense the wind's force and begin to rotate, thus converting wind energy into mechanical energy to power subsequent electricity generation. The shape and angle of the blades can reduce wind speed, decrease mechanical load, reduce damage to the turbine body and noise, and also change the wind direction, allowing wind energy to be better transferred to components such as the generator. Blade design takes into account changes in wind speed and different mechanical loads, adjusting the rotation speed and output power 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 towards larger wind turbine units is accelerating, especially with the rapid development of ultra-large units for desert and deep-sea applications. As the core component of wind turbines, the blades have already exceeded 100 meters in length. To meet structural requirements, the blade root often uses a relatively thick airfoil. However, due to its large operating angle of attack, the blade root usually cannot meet the requirements for ideal aerodynamic performance. Summary of the Invention

[0004] This application provides a wind turbine blade and a wind turbine blade design method that can minimize the flow velocity of fluid on the pressure surface, maximize the pressure on the pressure surface, and maximize power generation.

[0005] In a first aspect, embodiments of this application provide a wind turbine blade, comprising: a wind turbine blade body, including a blade root, a mid-section, and a blade tip distributed along its own length direction, and a pressure surface spanning the blade root, the mid-section, and the blade tip, wherein the mid-section is disposed between the blade root and the blade tip; and a spoiler, wherein the spoiler extends along the length direction of 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, 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, where m is a constant, 0 < m ≤ 50%.

[0006] According to the wind turbine blade of the present application embodiment, 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 disposed away from 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. 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 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 embodiments of this application, in the direction from the first end face to the second end face, the radial dimension of the spoiler protruding from the pressure surface shows a decreasing trend.

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

[0010] According to the wind turbine blades of the embodiments of this application, m ranges from 5% to 30%.

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

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

[0013] According to an embodiment of the present application, the wind turbine blade has a spoiler installed from the side of the blade root away from the blade tip to 20% of the length of the wind turbine blade.

[0014] Secondly, embodiments of this application also provide a wind turbine blade design method, including:

[0015] Determine the structural parameters of the wind turbine blade body, the structural parameters including the relative thickness of each airfoil along the length direction of the wind turbine blade body;

[0016] The pre-installed spoiler is installed at a preset position on the pressure surface of the wind turbine blade body. The preset position includes a first preset position of the pre-installed spoiler away from the first end face 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 the radial dimension H corresponding to at least one cross section of the spoiler along the length direction of the spoiler. The mapping relationship includes H = m * T, where 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 this application embodiment, the step of obtaining the design parameters of the pre-installed spoiler based on the mapping relationship between the design parameters of the pre-installed spoiler and the structural parameters of the wind turbine blade body further includes:

[0019] Determine the extension trend of the pre-installed spoiler along the length direction, the extension trend including the equal radial dimensions of the pre-installed spoiler along the length direction;

[0020] 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. The design parameters also include the first radial dimension H1 corresponding to the first end face of the spoiler facing away from the tip of the wind turbine blade body. The first radial dimension H1 satisfies the mapping relationship H = m * T, where H1 = H, T1 = T, and T1 is the first relative thickness of the airfoil of the wind turbine blade body that is coplanar with the first end face.

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

[0022] According to the wind turbine blade design method of this application embodiment, the step of determining the preset position of the pre-installed spoiler 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, the actual flow velocity and 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 actual pressure, the preset position for the pre-installed spoiler to be installed on the pressure surface of the wind turbine blade body is determined.

[0025] The wind turbine blade design method according to the embodiments of this 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 this application embodiment, by setting a spoiler on the pressure surface of the wind turbine blade body along the length direction of the wind turbine blade body, controls the flow velocity and pressure of the fluid on the pressure surface; the relative thickness T of the airfoil of the wind turbine blade body with the radial dimension H corresponding to at least one cross section of the spoiler plate and the cross section are coplanar, satisfies the relationship H=m*T, where m is a constant, 0<m≤50%, thereby the spoiler can reduce 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 thus maximize the power generation of the wind turbine blade. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

[0030] Figure 2 An example is shown. Figure 1 A magnified view of a portion of region B in the middle;

[0031] Figure 3 This is a partial front view of a wind turbine blade according to some embodiments of this application;

[0032] Figure 4 This is a cross-sectional view of the first end face of some embodiments of this application;

[0033] Figure 5 A comparison of the flow field of wind turbine blades in some embodiments of this application. Figure 1 ;

[0034] Figure 6 A comparison of the flow field of wind turbine blades in some embodiments of this application. Figure 2 ;

[0035] Figure 7 This is one of the flowcharts for wind turbine blade design methods according to some embodiments of this application;

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

[0037] Figure label:

[0038] 100: Airfoil; 101: Leading edge; 102: Trailing edge; 103: Pressure surface; 200: Wind turbine blade body; 210: Blade root; 220: Mid-section; 230: Blade tip; 201: Spoiler; 202: First end face; 203: Second end face. Detailed Implementation

[0039] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0041] With the rapid development of the wind power industry, the trend towards larger turbines is accelerating, especially with the rapid development of ultra-large turbines for desert and deep-sea applications. As the core component of wind turbines, blades have already exceeded 100 meters in length. To meet structural requirements, the blade root often uses a relatively thick airfoil. However, due to its large operating angle of attack, the blade root often cannot meet the requirements for ideal aerodynamic performance.

[0042] Improving the aerodynamic performance of the blade root is a common concern in the wind power industry. Currently, most methods employ flow control to improve flow field characteristics and enhance aerodynamic performance at the blade root. Spoilers, as a relatively simple power-enhancing device, have received widespread attention in the industry, and research on their power-enhancing effects is constantly deepening. However, existing spoiler designs fail to achieve the expected power-enhancing effect on wind turbine blades.

[0043] This application conducted multiple experiments on spoilers and found that the same spoiler had a better power enhancement effect on wind turbine blades with thicker airfoils than on those with thinner airfoils, thus revealing the correlation between airfoil thickness and spoilers. Furthermore, since the downwash effect of the fluid on the wind turbine blade is affected by the radial dimension of the spoiler protruding from the blade surface, in order to effectively reduce the downwash effect, the radial dimension of the spoiler protruding from the blade surface was correlated with the thickness of the wind turbine blade airfoil, resulting in a spoiler with the optimal power enhancement effect and a wind turbine blade with the highest power generation.

[0044] Definitions:

[0045] Blade root 210: The part in the wind turbine that connects the blades and the hub, which can be either a pre-embedded structure or a drilled structure.

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

[0047] Leading edge 101: The airfoil 100 of the blade is at the very front in the direction of rotation.

[0048] Trailing edge 102: The airfoil 100 of the blade is at the rearmost point in the direction of rotation.

[0049] Pressure surface 103: The side of the blade facing the wind, also known as the windward side - PS.

[0050] Suction side: The side of the blade facing away from the wind, also known as the leeward side - SS.

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

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

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

[0054] To address the problems of the prior art, this application provides a wind turbine blade and a wind turbine blade design method. The wind turbine blade provided in this application embodiment is described below.

[0055] Figure 1 This application shows schematic diagrams of the overall structure of wind turbine blades according to some embodiments; Figure 2 An example is shown. Figure 1 A magnified view of a portion of region B in the middle; Figure 3 A partial front view of a wind turbine blade according to some embodiments of this application is shown; Figure 4A cross-sectional view of the first end face 202 of some embodiments of this application is shown.

[0056] like Figures 1 to 4 As shown, an embodiment of this application provides a wind turbine blade, including: a wind turbine blade body 200 and a spoiler 201. The wind turbine blade body 200 includes a root portion 210, a mid-section portion 220, and a tip portion 230 distributed along its own length direction, and a pressure surface 103 spanning the root portion 210, the mid-section portion 220, and the tip portion 230. The mid-section portion 220 is located between the root portion 210 and the tip portion 230. The spoiler 201 extends along the length direction of the pressure surface 103 of the wind turbine blade body 200. The spoiler 201 has a radial dimension protruding from the pressure surface 103. 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, which is coplanar with the cross section, satisfy the relationship H = m * T, where m is a constant, 0 < m ≤ 50%.

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

[0058] In one embodiment of this application, the spoiler 201 includes a first end face 202 and a second end face 203 that are opposite each other in the length direction. The first end face 202 is disposed opposite to the blade tip 230 relative to the second end face 203. 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 that is 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.

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

[0060] To obtain a spoiler 201 with optimal power-enhancing effect, in one embodiment of this application, when the spoiler 201 has a constant width, the first radial dimension corresponding to the first end face 202 is taken as the overall radial dimension of the spoiler 201. Based on the relationship between the first relative thickness T1 and the first radial dimension H1, H1 = m * T1, where m is a constant, 0 < m ≤ 50%. By obtaining the first radial dimension H1, the overall radial dimension of the uniformly wide spoiler 201 is thus 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 spoiler 201, the weight of spoiler 201 is reduced while ensuring the power-enhancing effect. For example... Figure 2 As shown, in one embodiment of this application, the radial dimension of the spoiler 201 protruding from the pressure surface 103 decreases from the first end face 202 to the second end face 203.

[0062] The first radial dimension H1 of the first end face 202 is obtained through the above calculation. Taking the first radial dimension H1 as the maximum radial dimension, the radial dimension is gradually reduced towards the second end face 203 to obtain a spoiler 201 whose radial dimension gradually decreases along the length direction.

[0063] For example, based on the above-mentioned relationship between the first relative thickness T1 and the first radial dimension H1, H1 = m * T1, where m is a constant and 0 < m ≤ 50%, the relationship between the second relative thickness T2 of the second airfoil 100 with the second end face 203 coplanar and the corresponding second radial dimension H2 is further obtained, i.e., H2 = m * T2, where m is a constant and 0 < m ≤ 50%; thus, the second radial dimension H2 is obtained. This results in a spoiler 201 that smoothly transitions from the first radial dimension H1 to the second radial dimension H2 along the length direction.

[0064] Furthermore, in order to minimize the flow velocity of the fluid on the pressure surface 103 and maximize the pressure on the pressure surface 103, in other embodiments of this application, the relative thickness T of the airfoil 100 of the wind turbine blade body 200, which protrudes from the pressure surface 103 and is coplanar with all cross sections along the length of the spoiler 201, satisfies the relationship H = m * T, where m is a constant and 0 < m ≤ 50%.

[0065] In other words, the relative thickness of each radial dimension of the spoiler 201 along its length and the airfoil 100 with the same cross section all satisfy the relationship H=m*T, where m is a constant and 0<m≤50%. Thus, the spoiler 201 based on the relative thickness of the airfoil 100 at various points on the wind turbine blade body 200 is obtained.

[0066] Figure 5 A comparison of the flow field of wind turbine blades in some embodiments of this application. Figure 1 The radial dimension H of the spoiler 201 is 20%t; Figure 6 Comparison of flow field of conventional spoiler 201 wind turbine blades in existing technology Figure 2 .

[0067] like Figure 5 and Figure 6 As shown, when the pressure surface 103 is equipped with a spoiler 201 of the specified radial dimension as described in the above embodiment, the presence of the spoiler 201 in this application can significantly increase the pressure in the upstream region of the airfoil 100 compared to a conventional spoiler 201. The closer to the flow area of ​​the spoiler 201, the more significant the pressure increase. It also makes the negative pressure region of the suction surface more pronounced, directly leading to a substantial increase in the lift coefficient. Furthermore, the spoiler 201 in this application strengthens the downwash effect on the fluid in the pressure surface 103, causing the flow to separate earlier and forming a larger separation zone. The flow field at this time can be equivalent to the flow field of a large-thickness, blunt-edged airfoil 100 with a larger effective curvature. The fluid forms a plate tip 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 maximally slows down the flow velocity of the fluid in the pressure surface 103 and maximizes the pressure of the pressure surface 103, thereby achieving the best power generation effect.

[0068] In one optional embodiment of this application, m ranges from 5% to 30%. This application simulates wind turbine blades with m values ​​ranging from 0% to 50%, finding that wind turbine blades with m in the range of 5% to 30% exhibit good power generation, and the power generation improvement rate is considerable compared to wind turbine blades without spoiler 201. Key values ​​of m in the 5% to 30% range and their corresponding power generation improvement rates are shown in Table 1. The data in the table shows that the wind turbine blade equipped with spoiler 201 exhibits the largest power generation improvement rate of 0.178% when the radial dimension of spoiler 201 is 10%t.

[0069] Table 1

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

[0071] To further optimize the relative positional relationship between the spoiler 201 and the wind turbine blade body 200, in a specific embodiment of this application, such as... Figure 4 As shown, the chordal distance between the installation position of the spoiler 201 on the pressure surface 103 and the leading edge 101 of the coplanar airfoil 100 is 50% to 100% of the chord length of the coplanar airfoil 100.

[0072] With regard to the cross section of the coplanar airfoil 100, the first end face 202 of the spoiler 201 and the pressure surface 103 have an intersection point. The horizontal distance between the intersection point and the leading edge 101, i.e. the chordal distance, is X, where X = 50% - 100% C, and C is the chord length between the trailing edge 102 and the leading edge 101.

[0073] Furthermore, in one embodiment of this application, the tangent angle between the spoiler 201 and the pressure surface 103 at their intersection point ranges from 0° to 90°. Specifically, the tangent angle between the first end face 202 and the airfoil 100 at their intersection point ranges from 0° to 90°. Of course, in other embodiments of this application, the tangent angle between the spoiler 201 and the pressure surface 103 at their intersection point can also range from 90° to 180°.

[0074] The position of the spoiler 201 on the pressure surface 103 is further defined, as in the embodiments of this application, such as Figure 3 As shown, the spoiler 201 is installed from the side of the blade root 210 away from the blade tip 230 to a range of 20% of the length L of the wind turbine blade.

[0075] Specifically, spoilers 201 are installed on the blade root 210 and the mid-section 220. Starting from the side of the blade root 210 furthest from the blade tip 230, spoilers 201 are installed along the length of the wind turbine blade body 200, within a range of 20% of the blade length L. For example, the first end face 202 of spoiler 201 is flush with the side of the blade root 210 furthest from the blade tip 230, and the length of spoiler 201 is within 20%L. The length of spoiler 201 can be equal to 20%L.

[0076] Of course, in other embodiments of this application, the first end face 202 of the spoiler 201 can be placed at any position between the blade root 210 and the mid-section 220. The spoiler 201 can be a continuous structure or a discontinuous structure; that is, the spoiler 201 can include multiple segments, with the segments spaced apart within a range of 20%L. Of course, slots, holes, or other structures can also be formed on the spoiler 201 as needed.

[0077] Figure 7 One of the flowcharts illustrating a wind turbine blade design method according to some embodiments of this application is shown.

[0078] like Figure 7 As shown in the embodiments of this application, a wind turbine blade design method includes:

[0079] S1: Determine the structural parameters of the wind turbine blade body 200. These parameters include the relative thicknesses of each airfoil 100 along the length of the blade body 200. The relative thicknesses of each airfoil 100 can be obtained directly or indirectly. For example, the relative thickness can be calculated from the chord length and maximum thickness of each airfoil 100 included in the structural parameters. Alternatively, other parameters can be used to calculate the relative thicknesses of the airfoils 100. The structural parameters of the wind turbine blade body 200 may also include length, etc.

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

[0081] S2: Determine that the pre-installed spoiler 201 is installed at the preset position 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 face 202 of the blade tip 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. The design parameters include the 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 includes H = m * T, where 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, regarding the design parameters of the pre-installed spoiler 201, firstly, the structural shape of the pre-installed spoiler 201 is selected, for example, a cuboid shape; secondly, the trend of the radial dimension variation of the pre-installed spoiler 201 along the length direction is determined, for example, the radial dimension of the pre-installed spoiler 201 is equal along the length direction, or the radial dimension of the pre-installed spoiler 201 continuously decreases along the length direction. Finally, the radial dimension of the pre-installed spoiler 201 is obtained based on the mapping relationship.

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

[0086] Furthermore, in some optional embodiments of this application, the process 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 in step S3 further includes:

[0087] Determine the extension trend of the pre-installed spoiler 201 along the length direction, the extension trend including the equal radial dimensions of the pre-installed spoiler 201 along the length direction;

[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. The design parameters also include the first radial dimension H1 corresponding to the first end face 202 of the spoiler 201 facing away from the tip 230 of the wind turbine blade body 200. The first radial dimension H1 satisfies the mapping relationship H=m*T, where H1=H, T1=T, and T1 is the first relative thickness of the airfoil 100 of the wind turbine blade body 200 that is coplanar with the first end face 202.

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

[0090] For example, in other embodiments, the pre-installed spoiler 201 extends along its length from the first end face 202 to the second end face 203, with its radial dimension continuously decreasing. In the embodiments of this application, when the radial dimension of the pre-installed spoiler 201 along its length is determined to be continuously decreasing along its length, a mapping relationship can be used to obtain the radial dimensions at various points of the pre-installed spoiler 201.

[0091] Figure 8 The second flowchart illustrates a wind turbine blade design method according to some embodiments of this application.

[0092] like Figure 8 As shown, in other embodiments of this application, the pre-installed spoiler 201 is determined to be installed at a preset position on the pressure surface 103 of the wind turbine blade body 200. 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, obtain the actual flow velocity and actual pressure of the fluid on the pressure surface 103 of the wind turbine blade body 200; for example, in the simulation software, input the structural parameters of the wind turbine blade body 200 to establish a three-dimensional model of the wind turbine blade body 200; input the target environment, such as altitude, pressure, wind force, temperature, humidity and other parameters, into the simulation software to simulate the working conditions of the wind turbine blade body 200 in the target environment, thereby obtaining 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, on-site measurements can also be taken of 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 actual pressure, determine the preset position of the pre-installed spoiler 201 on the pressure surface 103 of the wind turbine blade body 200. For example, based on the actual flow velocity and 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 target pressure, so that the power generation of the wind turbine blade reaches or exceeds the preset power generation.

[0096] Specifically, in the embodiments of this 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] In other words, design parameters for multiple spoilers 201 can be obtained based on the mapping relationship, such as multiple first radial dimensions. Then, by considering 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, i.e., a suitable value of m, can be selected. For example, when m equals 5% to 30%, the target fluid velocity and target pressure can be achieved. Furthermore, the power generation for each m value can be calculated, and the m value with the highest power generation can be selected as the optimal value for the first radial dimension.

[0099] The wind turbine blade and wind turbine blade design method of this application embodiment, by setting a baffle 201 along the length direction of the wind turbine blade body 200 on the pressure surface 103 of the wind turbine blade body 200, can 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 baffle 201 is such that the relative thickness T of the airfoil 100 of the wind turbine blade body 200 coplanar with the cross section satisfies the relationship H=m*T, where m is a constant, 0<m≤50%. The resulting baffle 201 can reduce the flow velocity of the fluid on the pressure surface 103 to the maximum extent, increase the pressure on the pressure surface 103 to the maximum extent, and thus maximize the power generation of the wind turbine blade.

[0100] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A wind turbine blade, characterized in that, The wind turbine blade body (200) comprises a root portion (210), a middle portion (220), a tip portion (230) distributed along the length direction of the wind turbine blade body (200), and a pressure surface (103) spanning the root portion (210), the middle portion (220) and the tip portion (230), wherein the middle portion (220) is arranged between the root portion (210) and the tip portion (230). The spoiler (201) is a cuboid, and the spoiler (201) is arranged along the length direction of the pressure surface (103) of the wind turbine blade body (200). The spoiler (201) has a radial dimension protruding from the pressure surface (103). Along the length direction of the spoiler (201), the radial dimension H of 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) corresponding to the cross section satisfy the relationship H = m × T, wherein m is a constant, and 0 < m ≤ 50%. The spoiler (201) comprises a first end surface (202) and a second end surface (203) opposite to each other along the length direction. The first end surface (202) is arranged opposite to the second end surface (203) and away from the tip portion (230). The first end surface (202) has a first radial dimension H1 protruding from the pressure surface (103). The first relative thickness T1 of the airfoil (100) of the wind turbine blade body (200) corresponding to the first end surface (202) satisfies the relationship H = m × T, H1 = H, and T1 = T.

2. A wind turbine blade according to claim 1, characterised in that 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. From the first end surface (202) to the second end surface (203), the radial dimension of the spoiler (201) protruding from the pressure surface (103) decreases.

3. A wind turbine blade according to claim 2, characterised in that 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) corresponding to all cross sections satisfy the relationship H = m × T, wherein m is a constant, and 0 < m ≤ 50%.

4. A wind turbine blade according to claim 1, characterised in that The range of m is 5% to 30%.

5. A wind turbine blade according to claim 1, characterised in that The chordwise distance between the installation position of the spoiler (201) on the pressure surface (103) and the leading edge (101) of the airfoil (100) corresponding to the cross section is 50% to 100% of the chord length of the airfoil (100) corresponding to the cross section.

6. A wind turbine blade according to claim 1, characterised in that The included angle between the tangent line intersecting the spoiler (201) and the pressure surface (103) ranges from 0° to 90°.

7. A wind turbine blade according to claim 1, characterised in that The spoiler (201) is arranged on the side of the wind turbine blade body away from the tip portion (230) within a range of 20% of the length of the wind turbine blade body.

8. A wind turbine blade according to any of claims 1 to 7, characterised in that, The wind turbine blade body (200) comprises a root portion (210), a middle portion (220), a tip portion (230) distributed along the length direction of the wind turbine blade body (200), and a pressure surface (103) spanning the root portion (210), the middle portion (220) and the tip portion (230), wherein the middle portion (220) is arranged between the root portion (210) and the tip portion (230).

9. A wind turbine blade design method, characterized in that, ​ Determining a structural parameter of a wind turbine blade body (200), the structural parameter comprising a relative thickness of each airfoil (100) of the wind turbine blade body (200) along a length direction; Determining a preset position of a pre-installed spoiler (201) installed on a pressure surface (103) of the wind turbine blade body (200); Obtaining a design parameter of the pre-installed spoiler (201) based on a mapping relationship between the design parameter of the pre-installed spoiler (201) and the structural parameter of the wind turbine blade body (200), the design parameter comprising a radial dimension H corresponding to at least one cross section of the spoiler (201) along a length direction of the spoiler (201), the mapping relationship comprising H=m×T, m being a constant, 0 10. A wind turbine blade design method according to claim 9, wherein, The obtaining of the design parameter of the pre-installed spoiler (201) based on the mapping relationship between the design parameter of the pre-installed spoiler (201) and the structural parameter of the wind turbine blade body (200) further comprises: Determining an extension trend of the pre-installed spoiler (201) along the length direction, the extension trend comprising a radial dimension of the pre-installed spoiler (201) along the length direction being equal; The obtaining of the design parameter of the pre-installed spoiler (201) based on the mapping relationship between the design parameter of the pre-installed spoiler (201) and the structural parameter of the wind turbine blade body (200) further comprises that the design parameter further comprises a first radial dimension H1 corresponding to a first end surface (202) of the spoiler (201) facing away from a tip portion (230) of the wind turbine blade body (200), the first radial dimension H1 satisfying a mapping relationship H=m×T, wherein H1=H, T1=T, T1 being a first relative thickness of an airfoil (100) of the wind turbine blade body (200) coplanar with the first end surface (202); Determining that the radial dimension of the spoiler (201) along the length direction is equal to the first radial dimension H1.

11. A wind turbine blade design method according to claim 9, wherein, The determining of the preset position of the pre-installed spoiler (201) installed on the pressure surface (103) of the wind turbine blade body (200) further comprises: Obtaining an actual flow speed and an actual pressure of a fluid of the pressure surface (103) of the wind turbine blade body (200) based on a target environment and the structural parameter of the wind turbine blade body (200); Determining the preset position of the pre-installed spoiler (201) installed on the pressure surface (103) of the wind turbine blade body (200) based on the actual flow speed and the actual pressure.

12. A wind turbine blade design method according to any of claims 9 to 11, wherein, Further comprising: Determining a value of m based on a target flow speed and a target pressure of the fluid of the pressure surface (103) of the wind turbine blade body (200).

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