Wind turbine blade and wind turbine blade design method

Abstract

The present 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 comprises: a wind turbine blade body and a spoiler, wherein the spoiler extends in a length direction on a pressure surface of the wind turbine blade body, a radial dimension H corresponding to at least one cross section of the spoiler and a relative thickness T of an airfoil of the wind turbine blade body coplanar with the cross section satisfy a relationship of H=m*T, and m is a constant. The present application is used for solving the problem that wind turbine blades cannot meet ideal aerodynamic performance requirements.

Description

Wind power blade and wind power blade design method

[0001] Cross-reference to Related Applications

[0002] This application claims priority to Chinese Patent Application No. 202410895331.X, filed on July 4, 2024, entitled “Wind power blade and wind power blade design method”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application belongs to the field of power generation, and particularly relates to a wind power blade and a wind power blade design method. BACKGROUND

[0004] The wind power blade is a key component in a wind turbine generator set that converts wind energy in nature into electrical energy. When natural wind blows through the blade, the blade will feel the power of the wind and start to rotate, thereby converting wind energy into mechanical energy of the blade to provide energy for subsequent power generation. The shape and angle of the blade can slow down the wind speed, reduce mechanical load, reduce damage and noise of the fan body, and at the same time change the direction of the wind, so that the wind energy can be better transmitted to the generator and other components. The design of the blade takes into account the changes in wind speed and different mechanical loads, and adjusts the rotation speed and output power by controlling the shape and angle of the blade to ensure the stability and efficiency of the fan.

[0005] With the rapid development of the wind power industry, the trend of large-scale wind turbine generators is becoming faster and faster, especially the rapid development of super large units such as Shaguo Desert and deep sea. As the core component of the wind turbine, the length of the blade has broken through the hundred-meter level. In order to meet the structural requirements, the wing type with large thickness is often used at the root of the blade, and because the operating angle of attack is large, the root of the blade often cannot meet the demand of ideal aerodynamic performance. SUMMARY

[0006] The present application provides a wind power blade and a wind power blade design method, which can maximize the reduction of the flow speed of the fluid on the pressure surface, maximize the increase of the pressure on the pressure surface, and maximize the increase of the power generation.

[0007] In a first aspect, the embodiments of the present application provide a wind turbine blade, comprising: a wind turbine blade body comprising a root portion, a middle portion, a tip portion distributed along a length direction of the wind turbine blade body, and a pressure surface spanning the root portion, the middle portion and the tip portion, the middle portion being disposed between the root portion and the tip portion; a spoiler extending along the length direction of the wind turbine blade body on the pressure surface, the spoiler having a radial dimension protruding from the pressure surface, and along the length direction of the spoiler, a radial dimension H of at least one cross section of the spoiler and a relative thickness T of an airfoil of the wind turbine blade body corresponding to the cross section satisfy a relationship of H = m*T, m being a constant, and 0 < m ≤ 50%.

[0008] According to the wind turbine blade of the embodiments of the present application, the spoiler comprises a first end surface and a second end surface opposite to each other along the length direction, the first end surface is disposed away from the tip portion relative to the second end surface, a first radial dimension H1 of the first end surface protruding from the pressure surface, and a first relative thickness T1 of an airfoil of the wind turbine blade body corresponding to the first end surface satisfy a relationship of H = m*T, H1 = H, and T1 = T.

[0009] According to the wind turbine blade of the embodiments of the present application, 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.

[0010] According to the wind turbine blade of the embodiments of the present application, along a direction from the first end surface to the second end surface, the radial dimension of the spoiler protruding from the pressure surface presents a decreasing trend.

[0011] According to the wind turbine blade of the embodiments of the present application, along all cross sections of 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 corresponding to each cross section satisfy a relationship of H = m*T, m being a constant, and 0 < m ≤ 50%.

[0012] According to the wind turbine blade of the embodiments of the present application, m ranges from 5% to 30%.

[0013] According to the wind turbine blade of the embodiments of the present application, a chordwise distance between a mounting position of the spoiler on the pressure surface and a leading edge of the airfoil corresponding to the cross section is 50% to 100% of a chord length of the airfoil corresponding to the cross section.

[0014] According to the wind turbine blade of the embodiments of the present application, an included angle between a tangent line intersecting the spoiler and the pressure surface ranges from 0° to 90°.

[0015] According to the wind power blade of the embodiment of the present application, the spoiler is installed in a range from one side of the blade root part away from the blade tip part to 20% of the length of the wind power blade body.

[0016] In a second aspect, the embodiment of the present application also provides a wind power blade design method, comprising:

[0017] determining a structural parameter of the wind power blade body, the structural parameter comprising a relative thickness of each airfoil of the wind power blade body along a length direction;

[0018] determining a preset position of the pre-installed spoiler installed on a pressure surface of the wind power blade body, the preset position comprising a first preset position of a first end surface of the pre-installed spoiler away from a blade tip part of the wind power blade body;

[0019] obtaining a design parameter of the pre-installed spoiler based on a mapping relationship between the design parameter of the pre-installed spoiler and the structural parameter of the wind power blade body, the design parameter comprising a radial dimension H corresponding to at least one cross section of the spoiler along a length direction of the spoiler, the mapping relationship comprising H=m*T, m being a constant, 0<m≤50%, wherein T is a relative thickness of an airfoil of the wind power blade body coplanar with the cross section.

[0020] According to the wind power blade design method of the embodiment of the present application, the obtaining of the design parameter of the pre-installed spoiler based on the mapping relationship between the design parameter of the pre-installed spoiler and the structural parameter of the wind power blade body further comprises:

[0021] determining an extension trend of the pre-installed spoiler along the length direction, the extension trend comprising that the radial dimension of the pre-installed spoiler along the length direction is equal;

[0022] the obtaining of the design parameter of the pre-installed spoiler based on the mapping relationship between the design parameter of the pre-installed spoiler and the structural parameter of the wind power blade body, the design parameter further comprising a first radial dimension H1 corresponding to a first end surface of the spoiler away from a blade tip part of the wind power blade body, the first radial dimension H1 satisfying the mapping relationship H=m*T, wherein H1=H, T1=T, T1 being a first relative thickness of an airfoil of the wind power blade body coplanar with the first end surface;

[0023] determining that the radial dimension of the spoiler along the length direction is equal to the first radial dimension H1.

[0024] According to the wind power blade design method of the embodiment of the present application, the determining of the preset position of the pre-installed spoiler installed on the pressure surface of the wind power blade body further comprises:

[0025] obtaining actual flow velocity and actual pressure of the fluid on the pressure surface of the wind turbine blade body based on the target environment and structural parameters of the wind turbine blade body;

[0026] determining a preset position of the pre-installation spoiler on the pressure surface of the wind turbine blade body based on the actual flow velocity and the actual pressure.

[0027] According to the wind turbine blade design method of the embodiments of the present application, the method further comprises:

[0028] determining the value of m based on target flow velocity and target pressure of the fluid on the pressure surface of the wind turbine blade body.

[0029] The wind turbine blade and the wind turbine blade design method of the embodiments of the present application can control the flow velocity and pressure of the fluid on the pressure surface of the wind turbine blade body by arranging the spoiler on the pressure surface of the wind turbine blade body along the length direction of the wind turbine blade body; the relative thickness T of the airfoil of the wind turbine blade body corresponding to the radial dimension H of at least one cross section of the spoiler satisfies the relationship H = m*T, m is a constant, 0 BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced as follows, and other drawings can also be obtained by those of ordinary skill in the art without creative labor on the premise of not paying creative labor.

[0031] FIG. 1 is a schematic diagram of the overall structure of the wind turbine blade according to some embodiments of the present application;

[0032] FIG. 2 shows a partial enlarged view of the B region in FIG. 1 according to an example;

[0033] FIG. 3 is a partial front view of the wind turbine blade according to some embodiments of the present application;

[0034] FIG. 4 is a cross-sectional view at the first end surface according to some embodiments of the present application;

[0035] FIG. 5 is a flow field comparison diagram I of the wind turbine blade according to some embodiments of the present application;

[0036] FIG. 6 is a flow field comparison diagram II of the wind turbine blade according to some embodiments of the present application;

[0037] FIG. 7 is a first flowchart of the wind turbine blade design method according to some embodiments of the present application;

[0038] FIG. 8 is a second flowchart of the wind turbine blade design method according to some embodiments of the present application.

[0039] Reference signs: 100: airfoil; 101: leading edge; 102: trailing edge; 103: pressure surface; 200: wind turbine blade body; 210: root section; 220: mid-section; 230: tip section; 201: spoiler; 202: first end surface; 203: second end surface. DETAILED DESCRIPTION

[0040] The features and exemplary embodiments of the various aspects of the present application will be described in detail below with reference to the drawings. The following detailed description is merely intended to explain the present application, and is not intended to limit the present application. The present application can be implemented without some of the specific details. The following description of the embodiments is merely provided to give a better understanding of the present application by showing examples of the present application.

[0041] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0042] With the rapid development of the wind power industry, the trend of large-scale units is becoming faster and faster, especially the rapid development of super large units in desert, deep sea and other places. As the core component of wind turbines, the length of the blade has broken through the hundred-meter level. In order to meet the structural requirements, the root part of the blade often uses a larger thickness airfoil. Due to the large operating angle of attack, the root part of the blade often cannot meet the demand of ideal aerodynamic performance.

[0043] Improving the aerodynamic performance of the root part is a common concern in the wind power industry. At present, most of the methods for improving the aerodynamic performance of the root part are flow control. The spoiler is a relatively simple power augmentation device, which has attracted widespread attention in the industry, and the research on the power augmentation of the spoiler is also deepening. However, the existing spoiler design scheme cannot achieve the expected effect of power augmentation for wind turbine blades.

[0044] The present application carries out multiple tests on the spoiler, and finds that the same spoiler has better power increasing effect on the wind power blade with larger thickness airfoil than on the wind power blade with smaller thickness airfoil, thereby finding the correlation between the thickness of the airfoil and the spoiler. Moreover, based on the fact that the downwash effect of the fluid on the wind power blade is affected by the radial size of the spoiler protruding from the surface of the wind power blade, in order to effectively reduce the downwash effect of the spoiler, the radial size of the spoiler protruding from the surface of the wind power blade is correlated with the thickness of the airfoil of the wind power blade, so as to obtain the spoiler with optimal power increasing effect and the wind power blade with maximum power generation.

[0045] Noun explanation:

[0046] Blade root part 210: the part connecting the blade and the hub in the wind wheel, which has two forms of pre-buried structure and drilled structure.

[0047] Blade tip part 230: the part farthest from the wind energy rotation axis, which is also considered as the end of the length direction of the wind power blade (relative to the blade root part 210).

[0048] Leading edge 101: the front end of the airfoil 100 of the blade in the rotation direction.

[0049] Trailing edge 102: the last end of the airfoil 100 of the blade in the rotation direction.

[0050] Pressure surface 103: the side of the blade facing the wind, or the windward surface-PS.

[0051] Suction surface: the side of the blade away from the wind, or the leeward surface-SS.

[0052] Airfoil 100 chord length: the straight line distance between the leading edge 101 and the trailing edge 102 of the airfoil 100.

[0053] Airfoil 100 thickness: the diameter of the incircle of the contour of the airfoil 100, which can also be regarded as the distance between the upper and lower surfaces perpendicular to the chord length.

[0054] Relative thickness: the ratio of the thickness of the airfoil 100 to the chord length, which is used to describe the thickness of the airfoil 100.

[0055] In order to solve the related technical problems, the present application provides a wind power blade and a wind power blade design method. First, the wind power blade provided by the present application is introduced.

[0056] FIG. 1 shows the overall structure of the wind power blade according to some embodiments of the present application; FIG. 2 shows a partial enlarged view of region B in FIG. 1; FIG. 3 shows a partial front view of the wind power blade according to some embodiments of the present application; and FIG. 4 shows a cross-sectional view at the first end surface 202 according to some embodiments of the present application.

[0057] As shown in FIGS. 1-4, the 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 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, the middle portion 220 being disposed between the root portion 210 and the tip portion 230; the spoiler 201 being disposed 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, the corresponding 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 coplanar with the cross section satisfy the relationship H = m*T, m being a constant, 0 < m ≤ 50%.

[0058] For example, the spoiler 201 is cuboid-shaped, the spoiler 201 comprising a length, a width and a thickness, the length direction of the spoiler 201 being consistent with the length direction of the wind turbine blade body 200, i.e. the side surface of the spoiler 201 along the length direction is mounted on the pressure surface 103, the spoiler 201 can be directly in contact with the pressure surface 103 of the wind turbine blade body 200, or a mounting seat can be provided, and the spoiler 201 is connected with the pressure surface 103 through the mounting seat. 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 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 and thus reduce 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.

[0059] In one embodiment of the present application, 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 being disposed away from the tip portion 230 relative to the second end surface 203, the first radial dimension H1 of the first end surface 202 protruding from the pressure surface 103 being equal to the radial dimension H of the spoiler 201 protruding from the pressure surface 103, and the first relative thickness T1 of the airfoil 100 of the wind turbine blade body 200 coplanar with the first end surface 202 satisfying the relationship H = m*T, H1 = H, T1 = T.

[0060] The first end surface 202 of the spoiler 201 is close to the blade root part 210, and the second end surface 203 is close to the blade tip part 230. The first end surface 202 can be a flat surface. The flat first end surface 202 extends to cut the wind turbine blade body 200, and a corresponding cross-sectional airfoil 100 is obtained, as shown in FIG. 4. The first relative thickness T1 of the cross-sectional airfoil 100 is calculated based on the chord length C and the thickness W of the cross-sectional airfoil 100.

[0061] In order to obtain the spoiler 201 with the best power increasing effect, in an embodiment of the present application, when the spoiler 201 has a uniform width, the first radial dimension corresponding to the first end surface 202 is taken as the overall radial dimension of the spoiler 201. The first radial dimension H1 and the first relative thickness T1 satisfy the relationship H1 = m*T1, where m is a constant, and 0 < m ≤ 50%. The first radial dimension H1 is obtained, and the overall radial dimension of the spoiler 201 with a uniform width is H1. In other words, the radial dimension of the spoiler 201 protruding from the pressure surface 103 along the length direction of the spoiler 201 is equal to the first radial dimension H1.

[0062] Further, in order to further optimize the structure of the spoiler 201 and reduce the weight of the spoiler 201 under the premise of ensuring the power increasing effect, as shown in FIG. 2, in an embodiment of the present application, the radial dimension of the spoiler 201 protruding from the pressure surface 103 decreases gradually from the first end surface 202 to the second end surface 203.

[0063] The first radial dimension H1 of the first end surface 202 is obtained by the above calculation. The first radial dimension H1 is taken as the maximum radial dimension, and the radial dimension gradually decreases towards the second end surface 203, so that the radial dimension of the spoiler 201 gradually decreases along the length direction.

[0064] For example, based on the relationship H1 = m*T1 between the first radial dimension H1 and the first relative thickness T1, where m is a constant, and 0 < m ≤ 50%. The relationship between the second relative thickness T2 of the second airfoil 100 co-planar with the second end surface 203 and the second radial dimension H2 corresponding to the second end surface 203 is obtained, i.e. H2 = m*T2, where m is a constant, and 0 < m ≤ 50%. The second radial dimension H2 is obtained. The spoiler 201 is obtained, which smoothly transitions from the first radial dimension H1 to the second radial dimension H2 along the length direction.

[0065] In addition, in order to maximize the flow velocity of the fluid on the pressure surface 103 and maximize the pressure on the pressure surface 103, in other embodiments of the present application, the radial dimension H of the spoiler 201 protruding from the pressure surface 103 along the length direction of the spoiler 201 and the relative thickness T of the airfoil 100 of the wind turbine blade body 200 on each cross section are in a relationship of H = m*T, where m is a constant and 0 < m < 50%.

[0066] That is, the radial dimension H of the spoiler 201 along the length direction and the relative thickness T of the airfoil 100 on each cross section are in a relationship of H = m*T, where m is a constant and 0 < m < 50%. Thus, the spoiler 201 is based on the relative thickness of the airfoil 100 of the wind turbine blade body 200.

[0067] FIG. 5 is a comparison diagram of the flow field of the wind turbine blade according to some embodiments of the present application, where the radial dimension H of the spoiler 201 is 20% t; and FIG. 6 is a comparison diagram of the flow field of the wind turbine blade with a conventional spoiler 201.

[0068] As shown in FIGS. 5 and 6, when the pressure surface 103 is provided with the spoiler 201 with the specified radial dimension in the above embodiments, the presence of the spoiler 201 of the present application can significantly increase the pressure on the upstream region of the spoiler 201 compared with the airfoil 100 of the conventional spoiler 201, and the closer to the flow field of the spoiler 201, the more obvious the increase in pressure. At the same time, the negative pressure region of the suction surface is more obvious, which directly leads to a significant increase in the lift coefficient. In addition, the spoiler 201 of the present application can also strengthen the downwash effect on the fluid on the pressure surface 103 and cause the flow to separate earlier, forming a larger separation zone. At this time, the flow field can be equivalent to that of a large-thickness and large-blunt trailing edge airfoil 100 with a larger effective camber. The fluid forms a spoiler vortex behind the spoiler 201, and a secondary vortex is induced at the position of the included angle between the spoiler 201 and the pressure surface 103. The secondary vortex maximizes the flow velocity of the fluid on the pressure surface 103 and maximally increases the pressure on the pressure surface 103, thereby achieving the best power generation effect.

[0069] In an optional embodiment of the present application, m is in a range of 5% to 30%. The present application simulates the wind turbine blade with m in a range of 0 to 50%, and it is found that when m is in a range of 5% to 30%, the wind turbine blade has a better power generation capacity, and the power generation capacity is improved in an observable range compared with the wind turbine blade without the spoiler 201. The key values of m in the range of 5% to 30% and the corresponding power generation capacity improvement rates are shown in Table 1. As shown in the table, the wind turbine blade with the spoiler 201 of the present application has the largest power generation capacity improvement rate of 0.178% when the radial dimension of the spoiler 201 is 10% t.

[0070] Table 1

[0071] In order to further optimize the relative position relationship between the spoiler 201 and the wind turbine blade body 200, in the embodiments of the present application, as shown in FIG. 4, the installation position of the spoiler 201 on the pressure surface 103 is 50% to 100% of the chord length of the cross-sectionally co-planar airfoil 100 from the leading edge 101 of the cross-sectionally co-planar airfoil 100.

[0072] In terms of the cross-section in which the cross-sectionally co-planar airfoil 100 is located, the first end surface 202 of the spoiler 201 has an intersection with the pressure surface 103, and the horizontal distance between the intersection and the leading edge 101, i.e. the chord length, 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 an embodiment of the present application, the spoiler 201 and the tangent line passing through the intersection of the pressure surface 103 have an included angle ranging from 0° to 90°. Specifically, the tangent line passing through the intersection of the first end surface 202 and the airfoil 100 has an included angle ranging from 0° to 90°. Of course, in other embodiments of the present application, the included angle between the spoiler 201 and the tangent line passing through the intersection of the pressure surface 103 can also range from 90° to 180°.

[0074] Further limiting the position of the spoiler 201 on the pressure surface 103, in the embodiments of the present application, as shown in FIG. 3, the spoiler 201 is installed in a 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 body.

[0075] Specifically, the spoiler 201 is installed on the blade root portion 210 and the middle section portion 220, starting from the side of the blade root portion 210 away from the blade tip portion 230, and the spoiler 201 is installed in a range of 20% of the length L of the wind turbine blade body 200 in the length direction of the wind turbine blade body 200. For example, the first end surface 202 of the spoiler 201 is flush with the side of the blade root portion 210 away from the blade tip portion 230, the length of the spoiler 201 ranges in 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 portion 210 and the middle section portion 220. Among them, the spoiler 201 can be a continuous structure, or an intermittent structure, i.e. the spoiler 201 can include multiple sections, and the multiple sections of the spoiler 201 are arranged at intervals in the range of 20% L. Of course, according to needs, slots, holes and other structures can also be provided on the spoiler 201.

[0077] FIG. 7 shows a first flowchart of the wind turbine blade design method according to some embodiments of the present application.

[0078] As shown in FIG. 7, in the embodiments of the present application, a wind turbine blade design method comprises steps S1-S3.

[0079] S1: Determine the structural parameters of the wind turbine blade body 200, including 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 directly obtained or indirectly obtained, for example, the chord length and maximum thickness of each airfoil 100 included in the structural parameters, so as to calculate the relative thickness. Or other parameters can also 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 determination of the structural parameters of the wind turbine blade body 200 can be determined by the target environment and power generation demand. Of course, in the wind turbine blade of the present application, the wind turbine blade body 200 with determined structural parameters or the existing wind turbine blade body 200 can be selected.

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

[0082] For example, the pre-set position includes a first pre-set position of the first end surface 202 of the pre-installed spoiler 201 away from the tip portion 230 of the wind turbine blade body 200. Wherein, the pre-set 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, including the radial dimension H of at least one cross section of the spoiler 201 along the length direction of the spoiler 201, the mapping relationship includes H=m*T, m is a constant, 0

[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 cuboid shape; second, the radial dimension variation trend 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 is continuously reduced along the length direction. Finally, the radial dimension of the pre-installed spoiler 201 is 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, the 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 mapping relationship between the design parameters of the pre-installed spoiler 201 and the structural parameters of the wind turbine blade body 200 for step S3 is used to obtain the design parameters of the pre-installed spoiler 201, and the design parameters further include:

[0087] The extension trend of the pre-installed spoiler 201 along the length direction is determined, and the extension trend includes that the radial dimension of the pre-installed spoiler 201 along the length direction is equal;

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

[0089] The radial dimension of the pre-installed 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 surface 202 to the second end surface 203. In the embodiments of the present application, when it is determined that the radial dimension of the pre-installed spoiler 201 along the length direction continuously decreases, the mapping relationship can be used to obtain the radial dimension of the pre-installed spoiler 201 at each location.

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

[0092] As shown in FIG. 8, in other embodiments of the present application, the pre-installed spoiler 201 is determined to be installed at a preset position of the pressure surface 103 of the wind turbine blade body 200, and the wind turbine blade design method further includes steps S21 to S22.

[0093] S21: Based on the target environment and the structural parameters of the wind turbine blade body 200, the actual flow speed and the actual pressure of the fluid of 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 inputted, thereby establishing a three-dimensional model of the wind turbine blade body 200; the target environment, such as altitude, pressure, wind power, temperature, humidity, and the like, is inputted into the simulation software, thereby simulating the working condition of the wind turbine blade body 200 under the target environment, and thereby obtaining the actual flow speed and the actual pressure of the fluid of the pressure surface 103 of the wind turbine blade body 200.

[0094] Of course, the actual flow speed and the actual pressure of the fluid on the pressure surface 103 of the wind turbine blade body 200 can also be measured on site.

[0095] S22: Based on the actual flow speed and the actual pressure, the pre-installed spoiler 201 is installed at the preset position on the pressure surface 103 of the wind turbine blade body 200. For example, based on the actual flow speed and the actual pressure, the preset position of the wind turbine blade body 200 is adjusted so that the pressure surface 103 of the wind turbine blade reaches the target flow speed 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 further comprises, after step S3:

[0097] Based on the target flow speed and the target pressure of the fluid on the pressure surface 103 of the wind turbine blade body 200, the value of m is determined.

[0098] That is, based on the mapping relationship, the design parameters of the plurality of spoilers 201 can be obtained, for example, a plurality of first radial dimensions. Then, through the target flow speed and the 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 m value, is further selected. For example, when m is equal to 5% to 30%, the target fluid speed and the target pressure can be reached. Further, the power generation of each m value can be calculated, and the m value with the maximum power generation is selected as the optimal first radial dimension.

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

[0100] The above merely describes a specific implementation of the present application. Those skilled in the art can clearly understand the specific working processes of the system, modules and units described above for the convenience and brevity of description, and can refer to the corresponding processes in the foregoing method embodiments, which will not be described herein again. It should be understood that the protection scope of the present application is not limited to this, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application.

Claims

1. A wind turbine blade, comprising: a wind turbine blade body including a root section, a mid-section, a tip section and a pressure surface spanning the root section, the mid-section and the tip section, the mid-section being disposed between the root section and the tip section; a spoiler extending along a 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, a radial dimension H of at least one cross section of the spoiler and a relative thickness T of an airfoil of the wind turbine blade body coplanar with the cross section satisfy a relationship of H=m*T, m being a constant, 0 2. A wind power blade according to claim 1, wherein the spoiler includes a first end surface and a second end surface opposite to each other in the length direction, the first end surface being disposed opposite to the second end surface with respect to the tip section, a first radial dimension H1 of the first end surface protruding from the pressure surface, and a first relative thickness T1 of an airfoil of the wind turbine blade body coplanar with the first end surface satisfy a relationship of H=m*T, H1=H, T1=T; 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.

3. A wind turbine blade according to claim 2, wherein, the radial dimension of the spoiler protruding from the pressure surface decreases from the first end surface to the second end surface.

4. A wind power blade according to claim 1, wherein, along all cross sections of 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 coplanar with the cross section respectively satisfy a relationship of H=m*T, m being a constant, 0 5. The wind turbine blade of claim 1, wherein, m ranges from 5% to 30%.

6. A wind power blade according to claim 1, wherein, a chord-wise distance from a leading edge of the airfoil coplanar with the cross section to a mounting position of the spoiler on the pressure surface ranges from 50% to 100% of a chord length of the airfoil coplanar with the cross section.

7. A wind power blade according to claim 1, wherein, an angle between a tangent line intersecting the spoiler and the pressure surface ranges from 0° to 90°.

8. A wind power blade according to any of claims 1 to 7, wherein, the spoiler is mounted within a range of 20% of a length of the wind turbine blade from a side of the root section away from the tip section. 9.A wind turbine blade design method, comprising: determining structural parameters of a wind turbine blade body, the structural parameters including relative thicknesses of airfoils of the wind turbine blade body along a length direction; determining a pre-determined position of a pre-mounted spoiler on a pressure surface of the wind turbine blade body; obtaining design parameters of the pre-mounted spoiler based on a mapping relationship between the design parameters of the pre-mounted spoiler and the structural parameters of the wind turbine blade body, the design parameters including a radial dimension H of at least one cross section of the spoiler along a length direction of the spoiler, the mapping relationship including H=m*T, m being a constant, 0 10. A wind turbine blade design method according to claim 9, wherein, The mapping relationship between the design parameter of the pre-installed spoiler and the structural parameter of the wind power blade body, to obtain the design parameter of the pre-installed spoiler, further comprises: determining the extension trend of the pre-installed spoiler along the length direction, the extension trend comprising that the radial dimension of the pre-installed spoiler along the length direction is equal; The mapping relationship between the design parameter of the pre-installed spoiler and the structural parameter of the wind power blade body, to obtain the design parameter of the pre-installed spoiler, the design parameter further comprising a first radial dimension H1 corresponding to a first end surface of the spoiler facing away from the tip part of the wind power blade body, the first radial dimension H1 satisfying the mapping relationship H=m*T, wherein H1=H, T1=T, T1 being a first relative thickness of the airfoil of the wind power blade body coplanar with the first end surface; determining that the radial dimension of the spoiler 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 determination of the pre-installed spoiler being installed at the preset position of the pressure surface of the wind power blade body further comprises: based on the target environment and the structural parameter of the wind power blade body, obtaining the actual flow velocity and actual pressure of the fluid of the pressure surface of the wind power blade body; based on the actual flow velocity and actual pressure, determining that the pre-installed spoiler is installed at the preset position of the pressure surface of the wind power blade body.

12. The wind power blade design method according to any one of claims 9 to 11, further comprising: based on the target flow velocity and target pressure of the fluid of the pressure surface of the wind power blade body, determining the value of m.

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