Blade for wind power generation and wind power generator
By setting grooves, deformation sections, and pull wires on the blades, and utilizing the state transition of the deformation tube to form a cavity, the safety hazards caused by blade flutter are solved, flutter suppression and smooth airflow are achieved, and damage is avoided.
Patent Information
- Application Number
- CN202511829962.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-05
- Publication Date
- 2026-02-06
AI Technical Summary
In the existing technology, there is a lack of effective means to suppress flutter when the blades are stopped, which makes it difficult to eliminate safety hazards. Especially when the blade length increases, flutter can easily lead to damage or breakage.
Grooves, deformation sections, and tension wires are set on the blades. The tension of the tension wires straightens the deformation tube to fit the film and form a smooth curved surface. After the tension is released, the deformation tube returns to its bent state to form a cavity, thereby changing the airflow state to suppress vibration.
It effectively suppresses blade flutter, prevents damage or breakage, keeps airflow unaffected, and ensures the normal operation of wind turbines.
Smart Images
Figure CN121474047A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of wind power generation, in particular to a blade for a wind turbine and the wind turbine. BACKGROUND
[0002] With the rapid development of the wind power industry, the diameters of the impellers of land and offshore wind power equipment are continuously increasing. However, after the length of the blade is increased, the safety risk under a specific working condition is also highlighted: the blade is prone to flutter.
[0003] In the prior art, through the existing analysis method and simulation technology, the working condition that may induce flutter can be effectively reproduced to provide support for risk prediction. However, since the blade body is not equipped with any special vibration suppression accessory, the blade still lacks effective flutter suppression means in the shutdown state, and the safety hazard is difficult to eliminate. SUMMARY
[0004] The present application provides a blade for a wind turbine and the wind turbine to solve the problem of flutter of the blade in the prior art, which further leads to damage and even breakage.
[0005] The present application provides a blade for a wind turbine, comprising: a groove formed in the blade; at least one deformation portion connected to opposite ends of the groove in a first direction, the first direction being the extension direction of the blade; a stay wire penetrating the deformation portion in the first direction; the deformation portion comprises: a deformation tube; two fixing members, the two fixing members are respectively arranged at both ends of the deformation tube, and the two fixing members are arranged inside the groove, the stay wire penetrates the two fixing members and the deformation tube between the two fixing members; a film, one end of the film is connected with the deformation tube, and the other end of the film is connected with the outer side surface of the blade; wherein the deformation portion has at least a first state and a second state; in the first state, the stay wire is subjected to a pulling force, the deformation tube is deformed into a straightened state with the pulling of the stay wire, and the film is attached to the blade; in the second state, the stay wire is released from the pulling force, the deformation tube returns to a curved state, and the film and the surface of the blade form a cavity to change the airflow flow state of the surface of the blade.
[0006] According to the blade for a wind turbine provided by the present application, the blade has a first end and a second end; The blade is cut by a first plane to form a cross section, and the first plane is perpendicular to the first direction; The thickness of the first end is greater than the thickness of the second end.
[0007] According to the blade for a wind driven generator provided by the present application, the groove is arranged on one side close to the first end.
[0008] According to the blade for a wind driven generator provided by the present application, a gap is arranged between the fixing member and the deformation tube.
[0009] According to the blade for a wind driven generator provided by the present application, the surface of the deformation tube away from the bottom wall of the groove is a curved surface, which can block the slot of the groove to smoothly transition with the outer surface of the blade.
[0010] According to the blade for a wind driven generator provided by the present application, the number of the deformation portions is multiple, and the multiple deformation portions are connected to the opposite ends of the groove along the first direction.
[0011] According to the blade for a wind driven generator provided by the present application, the pull wire penetrates the multiple deformation portions in sequence.
[0012] According to the blade for a wind driven generator provided by the present application, the number of the fixing members and the number of the deformation tubes are both multiple. The multiple fixing members and the multiple deformation tubes are arranged in intervals and staggered.
[0013] The present application also provides a wind driven generator comprising the blade for a wind driven generator as described in any one of the above. The wind driven generator also comprises a support and a rotating shaft, and the rotating shaft is rotatably connected to the support. The blade is connected to the rotating shaft.
[0014] According to the wind driven generator provided by the present application, the number of the blades is multiple, and the multiple blades are arranged in intervals on the rotating shaft.
[0015] In the above technical solution, the groove, the deformation portion and the pull wire are arranged on the blade. When the blade does not vibrate, the pull wire is subjected to the tension, the deformation tube is subjected to the extrusion force of the tensioned pull wire, and the deformation tube changes from the curved state to the straightened state. The straightened deformation tube is arranged in the groove, and the straightened deformation tube pulls the film to move to the side close to the surface of the blade until the film is attached to the blade. The film and the outer surface of the blade form a smooth curved surface, so that the blade maintains the original aerodynamic structure, does not affect the flow of air, and does not affect the power generation of the wind driven generator set.
[0016] When the blade is in flutter, the pulling force on the pull wire is released, the pull wire changes from a tension state to a relaxation state, the deformation tube outside the pull wire changes from being extruded by the pull wire to being released from the extrusion of the pull wire, the deformation tube changes from a straight state to a curved state, the curved deformation tube at least partially protrudes from the outer surface of the blade, the curved deformation tube pulls the film to move away from the surface of the blade, and then the film and the surface of the blade form a cavity, the shape of the cavity can form a disturbance to the airflow passing through the blade, thereby inhibiting the vibration of the blade, and improving the damage or even rupture of the blade due to flutter. BRIEF DESCRIPTION OF DRAWINGS
[0017] In order to more clearly illustrate the technical solutions in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.
[0018] Figure 1 is a structural schematic diagram of the blade of the wind turbine provided by the present application; Figure 2 is a first state effect schematic diagram of the deformation part provided by the present application; Figure 3 is a structural schematic diagram of the deformation part provided by the present application; Figure 4 is a second state effect schematic diagram of the deformation part provided by the present application; Figure 5 is a structural schematic diagram of the cavity provided by the present application; Figure 6 is a structural schematic diagram of the gap provided by the present application; Figure 7 is a curved state effect schematic diagram of the deformation tube provided by the present application; Figure 8 is a straight state effect schematic diagram of the deformation tube provided by the present application; Figure 9 is a structural schematic diagram of the cavity of the wind turbine provided by the present application; Figure 10 is a partial enlarged view of part A in the present application Figure 9
[0019] Reference signs: 1, groove; 2, deformation part; 21, deformation tube; 211, curved surface; 22, fixing piece; 23, film; 24, gap; 3, pull wire; 4, cavity; 5, blade; 51, first end; 52, second end; 53, cross section; 6, support; 7, rotating shaft. DETAILED DESCRIPTION
[0020] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in conjunction with the accompanying drawings in the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the protection scope of the present application.
[0021] As part of the inventive concept of the present application, before describing the embodiments of the present application, the causes of the problem of blade fluttering and then causing damage or even breaking in the related art are analyzed, and the technical solutions of the embodiments of the present application are obtained through reasonable analysis.
[0022] After the length of the blade is increased, the safety risk in a specific operating or standby state under a specific working condition after hoisting is also highlighted. For example, during the operation of locking the impeller fastening bolt, or during the period when the unit is stopped due to the misalignment of the yaw system to the wind direction, the blade is prone to fluttering.
[0023] After the blade flutters, due to the existence of negative damping, the vibration energy cannot be effectively dissipated, and with the continuous accumulation of energy, the amplitude of the blade fluttering will gradually increase, which not only easily causes excessive fatigue cumulative damage, but also may cause damage or even breaking of the blade.
[0024] In the related art, when the blade flutters, the fluttering mode can be effectively destroyed by changing the direction of the impeller to the wind, or by changing the shape of the blade, so as to suppress the vibration of the blade.
[0025] Therefore, the present application provides a blade for a wind turbine and a wind turbine, by providing a groove, a deformation part and a wire on the blade; when the blade flutters, the tension on the wire is released, the wire changes from a tensioned state to a relaxed state, the deformation tube outside the wire changes from being extruded by the wire to being released from the extrusion of the wire, the deformation tube changes from a straight state to a curved state, the curved deformation tube pulls the film to move away from the surface of the blade, and then the film and the surface of the blade form a cavity, the shape structure of the cavity forms a disturbance to the airflow passing through the blade, which can suppress the vibration of the blade, thereby solving the problem of damage or even breaking due to the fluttering of the blade.
[0026] The technical solutions of the embodiments of the present application will be described in detail below with reference to the drawings. The technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict.
[0027] The embodiments of the present application provide a blade for a wind power generator, as shown in Figure 1 and Figure 2 The blade for a wind power generator comprises a groove 1, at least one deformation part 2 and a pull wire 3.
[0028] The groove 1 is arranged on the blade 5. The specific structure of the groove 1 is not limited in the embodiment, which is a structure that the slot extends in the first direction and is recessed in the blade 5, for example, a rectangular groove, an oblong groove, etc. The specific structure of the groove 1 in the embodiment is taken as a rectangular groove for illustration.
[0029] The at least one deformation part 2. In the embodiment, the at least one deformation part 2 specifically refers to one or more deformation parts 2, for example, one deformation part 2, two deformation parts 2, three deformation parts 2, four deformation parts 2, five deformation parts 2, six deformation parts 2, seven deformation parts 2, eight deformation parts 2, etc. The number of the deformation parts 2 in the embodiment is taken as eight for illustration.
[0030] Specifically, the at least one deformation part 2 is connected to the opposite ends of the groove 1 in the first direction, and the first direction is the extension direction of the blade 5.
[0031] As an implementable technical solution, the number of the deformation parts 2 is one, and the two ends of the one deformation part 2 are connected to the opposite ends of the groove 1 in the first direction.
[0032] As another implementable technical solution, the number of the deformation parts 2 is multiple, and the deformation parts 2 at the two ends in the first direction among the multiple deformation parts 2 are connected to the opposite ends of the groove 1.
[0033] In the embodiment, the pull wire 3 penetrates the deformation part 2 in the first direction. Wherein, As an implementable technical solution, the number of the deformation parts 2 is one, and the two ends of the one deformation part 2 are connected to the opposite ends of the groove 1 in the first direction, and the pull wire 3 penetrates the deformation part 2 in the first direction.
[0034] As another implementable technical solution, the number of the deformation parts 2 is multiple, and the deformation parts 2 at the two ends in the first direction among the multiple deformation parts 2 are connected to the opposite ends of the groove 1, and the pull wire 3 penetrates the multiple deformation parts 2 in the first direction in sequence.
[0035] In the embodiment, as shown in Figures 3 to 5 The deformation part 2 comprises a deformation tube 21, two fixing members 22 and a film 23.
[0036] The deforming tube 21 is a tubular structure with deforming ability. The specific material of the deforming tube 21 is not limited in the embodiment, and can be a material with corrosion resistance, elasticity, and high fatigue strength.
[0037] The specific structure of the fixing member 22 is not limited in the embodiment, and can be a structure capable of penetrating the pull wire 3 and being fixed inside the groove 1, such as a fixing tube or a fixing ring. The specific structure of the fixing member 22 in the embodiment is taken as a fixing tube for example.
[0038] Specifically, the two fixing members 22 are respectively arranged at the two ends of the deforming tube 21. The two fixing members 22 arranged at the two ends of the deforming tube 21 in the embodiment specifically means that the two fixing members 22 are located at the two ends of the deforming tube 21, such as the two fixing members 22 being respectively connected to the two ends of the deforming tube 21 or the two fixing members 22 being respectively located at the two ends of the deforming tube 21 and not being connected to the two ends of the deforming tube 21.
[0039] Specifically, the two fixing members 22 are arranged inside the groove 1, and the pull wire 3 penetrates the two fixing members 22 and the deforming tube 21 between the two fixing members 22.
[0040] The specific shape of the film 23 is not limited in the embodiment, and can be a shape with at least two sides, such as a semicircular shape, a rectangular shape, or a sector shape. The specific shape of the film 23 in the embodiment is taken as a sector shape for example.
[0041] Specifically, one end of the film 23 is connected to the deforming tube 21, and the other end of the film 23 is connected to the outer side surface of the blade 5.
[0042] The deforming part 2 has at least a first state and a second state. In the first state, when the pull wire 3 is subjected to a pulling force, the deforming tube 21 deforms into a straightened state along with the tightening of the pull wire 3, and the film 23 is attached to the blade 5.
[0043] Since the pull wire 3 penetrates the inside of the deforming tube 21, and the deforming tube 21 has the ability to deform, when at least one end of the pull wire 3 is subjected to a pulling force, the pull wire 3 changes from a relaxed state to a tightened state. The pull wire 3 in the tightened state is in a shape extending along the first direction, and the deforming tube 21 outside the pull wire 3 changes from a curved state to a straightened state under the extrusion of the pull wire 3. The deforming tube 21 in the straightened state is in a shape extending along the first direction, and is arranged inside the groove 1.
[0044] Since one end of the film 23 is connected with the deformation tube 21 and the other end of the film 23 is connected with the outer surface of the blade 5, the deformation tube 21 in the concave 1 and in the straightened state pulls the film 23 to move to the side close to the surface of the blade 5 until the film 23 is attached to the blade 5, and the film 23 and the outer surface of the blade 5 form a smooth transition curved surface.
[0045] In the embodiment, at least one of the two ends of the pull wire 3 is subjected to the pulling force, including that one of the two ends of the pull wire 3 is subjected to the pulling force, or the other end of the two ends of the pull wire 3 is subjected to the pulling force, or both ends of the pull wire 3 are subjected to the pulling force. In the embodiment, the case that both ends of the pull wire 3 are subjected to the pulling force is taken as an example for description.
[0046] In the second state, when the pull wire 3 is not subjected to the pulling force, the deformation tube 21 returns to the curved state, and the film 23 and the surface of the blade 5 form the cavity 4 to change the airflow flowing state of the surface of the blade 5.
[0047] Since the pull wire 3 penetrates the inside of the deformation tube 21, the deformation tube 21 has the ability to deform, and the natural state of the deformation tube 21 is the curved state. Therefore, when the pull wire 3 is not subjected to the pulling force, the pull wire 3 changes from the tension state to the relaxation state, and the pull wire 3 in the relaxation state is not subjected to the pulling force, and the deformation tube 21 outside the pull wire 3 changes from being subjected to the extrusion force of the pull wire 3 to being not subjected to the extrusion force of the pull wire 3, and the deformation tube 21 changes from the straightened state to the curved state, and the curved deformation tube 21 is at least partially structured to protrude from the outer surface of the blade 5.
[0048] Since one end of the film 23 is connected with the deformation tube 21 and the other end of the film 23 is connected with the outer surface of the blade 5, the curved deformation tube 21 which is at least partially structured to protrude from the outer surface of the blade 5 pulls the film 23 to move to the side away from the surface of the blade 5, and the film 23 and the surface of the blade 5 form the cavity 4.
[0049] In the above technical solution, by arranging the concave 1, the deformation part 2 and the pull wire 3 on the blade 5, when the blade 5 does not vibrate, the pull wire 3 is subjected to the pulling force, the deformation tube 21 subjected to the extrusion force of the pull wire 3 in the tension state changes from the curved state to the straightened state, the deformation tube 21 in the straightened state is arranged in the inside of the concave 1, and the deformation tube 21 in the straightened state pulls the film 23 to move to the side close to the surface of the blade 5 until the film 23 is attached to the blade 5, and the film 23 and the outer surface of the blade 5 form a smooth transition curved surface, so that the blade 5 maintains the original aerodynamic shape structure, does not affect the airflow flowing, and does not affect the power generation of the wind turbine generator.
[0050] When the blade 5 vibrates, the tension of the pull wire 3 is released, the pull wire 3 changes from the tension state to the relaxation state, the deformation tube 21 sleeved outside the pull wire 3 changes from the extrusion of the pull wire 3 to the release of the extrusion of the pull wire 3, the deformation tube 21 changes from the straight state to the curved state, the curved deformation tube 21 at least partially protrudes from the outer surface of the blade 5, the curved deformation tube 21 pulls the film 23 to move away from the surface of the blade 5, and then the film 23 and the surface of the blade 5 form the cavity 4, the shape of the cavity 4 can disturb the airflow passing through the blade 5, thereby inhibiting the vibration of the blade 5, and improving the damage or even the rupture of the blade 5 due to the vibration.
[0051] In the embodiment, the blade 5 has a first end 51 and a second end 52.
[0052] The blade 5 is cut by a first plane to form a cross section 53. The first plane is perpendicular to the first direction.
[0053] The thickness of the first end 51 of the blade 5 is greater than the thickness of the second end 52.
[0054] Specifically, the groove 1 is arranged on one side close to the first end 51.
[0055] In other specific embodiments of the embodiment, the groove 1 can also be arranged between the first end 51 and the second end 52, that is, the groove 1 is arranged in the middle of the blade 5 along the second direction. The second direction is the arrangement direction of the first end 51 and the second end 52.
[0056] In other specific embodiments of the embodiment, the groove 1 can also be arranged on one side close to the second end 52.
[0057] In the embodiment, as shown in Figure 6 , a gap 24 is left between the fixing member 22 and the deformation tube 21.
[0058] In the above technical solution, by arranging the gap 24 between the fixing member 22 and the deformation tube 21, when the pull wire 3 is subjected to the tension or the tension is released, the length of the deformation tube 21 along the first direction changes in the process of the deformation tube 21 changing between the curved state and the straight state; the gap 24 can provide space for the length of the deformation tube 21 along the first direction to increase when the deformation tube 21 changes from the curved state to the straight state, and improves the situation that the deformation tube 21 is blocked when changing from the curved state to the straight state due to the direct connection between the fixing member 22 and the deformation tube 21.
[0059] In the embodiment, as shown in Figure 7 and Figure 8As shown, the surface of the deformation tube 21 away from the side of the bottom wall of the groove 1 is a curved surface 211, which can block the slot of the groove 1 to smoothly transition with the outer surface of the blade 5.
[0060] In the above technical solution, by setting the surface of the deformation tube 21 away from the side of the bottom wall of the groove 1 as a curved surface 211, the curved surface 211 can block the slot of the groove 1 to smoothly transition with the outer surface of the blade 5, so that when the blade 5 does not vibrate, the tensioned tensioning wire 3 is extruded by the tensioned tensioning wire 3, the deformation tube 21 in the straightened state is placed in the groove 1, and the curved surface 211 blocks the slot of the groove 1, and the curved surface 211 can smoothly transition with the outer surface of the blade 5, so that the blade 5 maintains the original aerodynamic shape structure, does not affect the flow of air, and does not affect the power generation of the wind turbine generator.
[0061] In this embodiment, the number of deformation portions 2 is multiple. Among them, the multiple deformation portions 2 in this embodiment specifically refer to two or more deformation portions 2, such as two deformation portions 2, three deformation portions 2, four deformation portions 2, five deformation portions 2, six deformation portions 2, seven deformation portions 2, eight deformation portions 2, etc. In this embodiment, eight deformation portions 2 are taken as an example for description.
[0062] Specifically, the multiple deformation portions 2 are connected to the opposite ends of the groove 1 along the first direction. Among them, the multiple deformation portions 2 connected to the opposite ends of the groove 1 along the first direction in this embodiment specifically refer to the deformation portions 2 at the two ends of the multiple deformation portions 2 along the first direction connected to the opposite ends of the groove 1.
[0063] In the above technical solution, by setting multiple deformation portions 2, when the blade 5 vibrates, the tension on the tensioning wire 3 is removed, the multiple deformation portions 2 on the outer surface of the blade 5 recover from the straightened state to the curved state, and then multiple cavities 4 are formed on the outer surface of the blade 5, further improving the ability to disturb the airflow passing through the blade 5 to suppress the vibration of the blade 5, and improving the damage or even breakage of the blade 5 due to vibration.
[0064] Among them, the multiple cavities 4 in this embodiment specifically refer to two or more cavities 4, such as two cavities 4, three cavities 4, four cavities 4, five cavities 4, six cavities 4, seven cavities 4, eight cavities 4, etc. In this embodiment, seven cavities 4 are taken as an example for description.
[0065] Specifically, the plurality of cavities 4 are arranged on the outer surface of the blade 5 along the first direction, and the pull wire 3 penetrates the plurality of deformation portions 2 along the first direction in sequence, so that when the pull wire 3 is subjected to a pulling force, a plurality of cavities 4 can be formed on the outer surface of the blade 5 at the same time in a short time, the ability to disturb the airflow flowing through the blade 5 is improved, thereby suppressing the vibration of the blade 5, and the damage or even the breakage of the blade 5 due to the flutter of the blade 5 is improved.
[0066] In the embodiment, the number of the fixing members 22 and the number of the deformation tubes 21 are both plural.
[0067] Specifically, the plurality of fixing members 22 and the plurality of deformation tubes 21 are arranged in an interval and staggered, for example, the arrangement mode of the plurality of fixing members 22 and the plurality of deformation tubes 21 along the first direction is fixing member 22, deformation tube 21, fixing member 22, deformation tube 21, fixing member 22.
[0068] In the above technical solution, by arranging the plurality of fixing members 22 and the plurality of deformation tubes 21 in an interval and staggered, when the pull wire 3 is subjected to a pulling force, a plurality of independent cavities 4 can be formed on the outer surface of the blade 5 at the same time in a short time, the ability to disturb the airflow flowing through the blade 5 is further improved, thereby suppressing the vibration of the blade 5, and the damage or even the breakage of the blade 5 due to the flutter of the blade 5 is improved.
[0069] The embodiment of the present application also provides a wind turbine, which comprises the blade 5 for the wind turbine of any one of the above embodiments.
[0070] As shown in Figure 9 and Figure 10 In the embodiment, the wind turbine further comprises a support 6 and a rotating shaft 7.
[0071] The support 6 is arranged on a supporting surface. The supporting surface in the embodiment specifically refers to a surface capable of supporting the support 6, for example, the ground.
[0072] The rotating shaft 7 is rotationally connected to the support 6, and the blade 5 is connected to the rotating shaft 7. When the airflow flows onto the blade 5, the airflow applies a pushing force to the blade 5. Since the blade 5 is connected to the rotating shaft 7, the rotating shaft 7 is also subjected to the force, so the rotating shaft 7 rotates, thereby driving the generator set arranged in the wind turbine to generate electricity.
[0073] In the embodiment, the number of the blade 5 is plural. The plurality of blades 5 in the embodiment specifically refers to two or more blades 5, for example, two blades 5, three blades 5, four blades 5, five blades 5, six blades 5, seven blades 5, eight blades 5, etc. The number of the blade 5 in the embodiment is taken as three for example.
[0074] Specifically, the plurality of blades 5 are connected to the rotating shaft 7 in an interval.
[0075] In the embodiment, the blade 5 of the wind driven generator is further provided with a vibration sensor and a control module. The vibration sensor is used to collect the intensity of vibration of the blade 5 and send the data of the intensity of vibration of the blade 5 to the control module.
[0076] The control module is used to determine whether the data of the intensity of vibration of the blade 5 reaches a set threshold value. If the data of the intensity of vibration of the blade 5 reaches the set threshold value, the control module controls to release the tension of the stay wire 3, and then the plurality of deformation portions 2 on the outer surface of the blade 5 are restored from the straightened state to the curved state, a plurality of cavities 4 are formed on the outer surface of the blade 5, the airflow passing through the blade 5 is disturbed, thereby inhibiting the vibration of the blade 5, and improving the damage or even the breakage of the blade 5 due to the flutter of the blade 5.
[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims
1. A blade for a wind turbine, characterized in that, include: A groove (1) is formed on the blade (5); At least one deformable part (2) is connected to the opposite ends of the groove (1) along a first direction, which is the extension direction of the blade (5); A pull wire (3) passes through the deformable part (2) along the first direction. The deformable part (2) includes: Deformation tube (21); Two fasteners (22) are respectively disposed at both ends of the deformation tube (21) and the two fasteners (22) are disposed inside the groove (1). The pull wire (3) passes through the two fasteners (22) and the deformation tube (21) between the two fasteners (22). A thin film (23) is connected at one end to the deformation tube (21) and at the other end to the outer surface of the blade (5). The deformable part (2) has at least a first state and a second state; In the first state, when the pull wire (3) is subjected to tension, the deformation tube (21) deforms into a straight state as the pull wire (3) is tightened, and the film (23) adheres to the blade (5); In the second state, when the tension of the pull wire (3) is released, the deformation tube (21) returns to the bent state, and the film (23) and the surface of the blade (5) form a cavity (4) to change the airflow state on the surface of the blade (5).
2. The blade for a wind turbine according to claim 1, characterized in that, The blade (5) has a first end (51) and a second end (52); The blade (5) is cut by a first plane to form a cross section (53), and the first plane is perpendicular to the first direction; The thickness of the first end (51) is greater than the thickness of the second end (52).
3. The blade for a wind turbine according to claim 2, characterized in that, The groove (1) is formed on one side near the first end (51).
4. The blade for a wind turbine according to claim 1, characterized in that, A gap (24) is left between the fixing member (22) and the deformation tube (21).
5. The blade for a wind turbine according to claim 1, characterized in that, The surface of the deformable tube (21) facing away from the bottom wall of the groove (1) is a curved surface (211). The curved surface (211) can block the opening of the groove (1) so as to smoothly transition with the outer surface of the blade (5).
6. The blade for a wind turbine according to any one of claims 1-5, characterized in that, The number of the deformable parts (2) is multiple, and the multiple deformable parts (2) are connected to the opposite ends of the groove (1) along the first direction.
7. The blade for a wind turbine according to claim 6, characterized in that, The pull wire (3) passes through multiple deformable parts (2) in sequence.
8. The blade for a wind turbine according to claim 6, characterized in that, The number of the fixing member (22) and the deformation tube (21) are both multiple; The plurality of the fixing members (22) are spaced apart from and staggered with the plurality of the deformation tubes (21).
9. A wind turbine generator, characterized in that, Including the blades for wind turbines as described in any one of claims 1-8; It also includes a bracket (6) and a rotating shaft (7), the rotating shaft (7) being rotatably connected to the bracket (6); The blade (5) is connected to the rotating shaft (7).
10. The wind turbine generator according to claim 9, characterized in that, The number of blades (5) is multiple, and the multiple blades (5) are connected at intervals on the rotating shaft (7).