Flexible vibration self-adaptive wind turbine blade

Abstract

The invention relates to a flexible vibration self-adaption wind turbine blade which comprises a blade body, the rear edge of the blade body is flexibly connected with a flap through an inflatable expansion body, and inflatable cavities are formed in the positions, on the two sides of a chord line, of the expansion body. The chambers located on the two sides of the chord line swing along with the flap to change the compression degree so as to adjust the counter-acting force of the expansion body on the flap in a self-adaptive mode, and the flap angle between the blade body and the flap tends to be stable. The device is simple and compact in structure, light in self weight, high in strength, foldable and rapid to mount; when the blade works and the wind power is large, the flexible structure is affected by the wind power and can be bent upwards, and the stability of the whole blade is guaranteed. When the wind power is reduced, the flexible structure is affected by the pressure difference of the two air chambers and can be bent downwards, the operation efficiency of the blade at the low wind speed can be improved, and the effects of increasing efficiency and expanding stability are achieved.

Description

Technical Field

[0001] The invention relates to a fan blade, in particular to a flexible vibration self-adaptive wind turbine blade. Background Art

[0002] As an inexhaustible clean energy, wind energy helps reduce human dependence on fossil energy. In order to improve the efficiency of wind energy utilization of limited land resources and reduce the cost of electricity, the large-scale capacity of wind power units is an inevitable development trend. In recent years, the world's wind power generation has grown at an average rate of more than 30%. The rapid development of the global wind power industry has driven the rapid development of wind turbines. Blades are one of the key components of wind turbines. Their performance directly affects the wind energy utilization efficiency and the load on the wind turbine. Wind turbine flaps can affect the flow state of airflow on the blades by changing the shape and area of ​​the blade surface, thereby adjusting the lift and resistance of the blades. Effective control of the flap angle can optimize these aerodynamic characteristics and thus improve the power generation efficiency of the wind turbine. Reasonable control of the flap angle can also reduce the ultimate load and fatigue load of the blades, thereby extending the service life of the wind turbine. This is because the adjustment of the flap angle can change the aerodynamic characteristics of the blades, reduce the force of the blades under extreme wind conditions, and reduce the wear and fatigue damage of the blades. The angle control of wind turbine flaps can also improve the stability and adaptability of the wind turbine.

[0003] At present, flap angle control is mainly achieved through electrical control, mechanical transmission and advanced avionics technology. The need for more complex actuators and control mechanisms has led to a sharp increase in weight, manufacturing costs, and cumbersome blade transportation, which has hindered the development of wind turbines and reduced the overall performance of the unit and the economic efficiency of wind power development and utilization. Summary of the invention

[0004] The purpose of the present invention is to provide a flexible vibration adaptive wind turbine blade in view of the deficiencies of the prior art. The blade has a simple and compact structure, is light in weight, has high strength, is foldable, and can be quickly installed. When the blade is working and the wind force is strong, the flexible structure will be affected by the wind force and will bend upward to ensure the stability of the entire blade. When the wind force decreases, the flexible structure will be affected by the pressure difference between the two air chambers and will bend downward, which will improve the operating efficiency of the blade at low wind speeds and has the effect of increasing efficiency and expanding stability.

[0005] The object of the present invention is achieved in this way: a flexible vibration self-adaptive wind turbine blade,

[0006] It includes a blade body, the trailing edge of which is flexibly connected to a flap via an inflatable expansion body, the expansion body being provided with inflatable chambers on both sides of the chord, the compression degree of the chambers on both sides of the chord changing with the swing of the flap so as to adaptively adjust the reaction force of the expansion body on the flap and make the flap angle between the blade body and the flap tend to be stable.

[0007] The blade body includes a first main beam and a second main beam arranged along the wingspan direction, the proximal ends of the first main beam and the second main beam are connected to the blade root, and also includes a first primary beam perpendicular to the wingspan direction and arranged along the wingspan direction, the main beam and / or the secondary beam are flexible inflatable membrane structures, and the first primary beam is connected at both ends to the first main beam and the second main beam respectively, wherein the main beam and the secondary beam are connected to form a skeleton structure of the blade body, and a plurality of inflatable chambers are provided on the surface of the skeleton structure, and the outer walls of the plurality of inflatable chambers form the wing surface of the blade body.

[0008] The flap includes a third main beam arranged along the wingspan direction and a secondary beam arranged in a direction perpendicular to the wingspan and along the wingspan direction, the front end of the second beam is connected to the third main beam, the main beam and / or the secondary beam are flexible inflatable structural membrane structures, wherein the front end of the second beam is connected to the third main beam to form a flap skeleton structure, a plurality of inflatable chambers are provided on the surface of the flap skeleton structure, and the outer wall surfaces of the plurality of inflatable chambers form the wing surface of the flap.

[0009] The main beam comprises a first inflatable column, a second inflatable column arranged in the center of the first inflatable column, at least three inflatable columns are arranged in the annular space between the first inflatable column and the second inflatable column, and the inflatable column is made of a film.

[0010] A number of chambers are arranged on both sides of the string from front to back.

[0011] The inflation pressure in the chamber along one side of the chord line from front to back is gradually reduced, so that the chamber adjacent to the flap responds to the change in the flap angle first and the compression degree of the chamber gas changes.

[0012] Communication is provided between adjacent chambers on the same side of the string line through a one-way valve and a pressure relief valve.

[0013] A plurality of air-filled chambers laid on the skeleton structure are communicated with adjacent secondary beams through connecting ports provided with one-way valves.

[0014] The one-way valve comprises two flaps, the edges of which extend along the air inlet direction and close together; the expansion body is made of elastic material.

[0015] The flap comprises a plurality of independently movable flap sections arranged along the wingspan direction, and inflatable chambers are arranged on both sides of the chord line of each flap section.

[0016] The present invention has a simple and compact structure, light weight, high strength, foldability and quick installation. When the blade is working and the wind force is strong, the flexible structure will be affected by the wind force and will bend upward to ensure the stability of the entire blade. When the wind force decreases, the flexible structure will be affected by the pressure difference between the two air chambers and will bend downward, which will increase the operating efficiency of the blade at low wind speeds and has the effect of increasing efficiency and stability. The flexible connection of the expansion body can reduce the vibration effect of the flap attitude change on the blade body. It can also reduce the blade's limit load and fatigue load, thereby extending the service life of the wind turbine. By adjusting the flap angle, the wind turbine can maintain a stable operating state under complex and changeable wind conditions, reducing fluctuations and instability caused by changes in wind conditions. This helps to improve the reliability and safety of the wind turbine and reduce operation and maintenance costs.

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0020] Figure 3 It is a structural schematic diagram of a one-way valve;

[0021] Figure 4 It is the streamline diagram of the blade of the present invention at low wind speed;

[0022] Figure 5 It is the streamline diagram of conventional blades at low wind speed;

[0023] Figure 6 It is the streamline diagram of the blade under high wind speed;

[0024] Figure 7 The lift coefficient comparison chart of the improved airfoil and the original airfoil at an attack angle of 10°.

[0025] In the accompanying drawings, 100 is the blade body, 110 is the first main beam, 120 is the second main beam, 150 is the first primary beam, 200 is the expansion body, 201 is the one-way valve, 202 is the pressure relief valve, 210 is the chamber (210), 220 is the third main beam, 240 is the second secondary beam, 300 is the flap, a is the inflation column, b is the inflation chamber, and c is the leaflet. DETAILED DESCRIPTION

[0026] Specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" can be used to explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more. It should be noted that in practical applications, due to the limitations of equipment accuracy or installation errors, absolute parallel or perpendicular effects are difficult to achieve. The description of vertical, parallel or same direction in this application is not an absolute limiting condition, but means that a vertical or parallel structural setting can be achieved within a preset error range and the corresponding preset effect can be achieved. In this way, the technical effect of the limited features can be maximized, and the corresponding technical solution can be easy to implement and has high feasibility.

[0029] See also Figure 1-7 , an embodiment of a flexible vibration adaptive wind turbine blade, a flexible vibration adaptive wind turbine blade, the blade includes a trailing edge and a leading edge. The leading edge usually has a curved and rounded shape, while the trailing edge usually has a sharp or blunt edge. The straight line between the trailing edge and the leading edge is called a chord line, and the chord line divides the airfoil into a pressure side and a suction side. In this embodiment, the flexible vibration adaptive wind turbine blade includes a blade body 100, the trailing edge of the blade body 100 is flexibly connected to a flap 300 through an inflatable expansion body 200, and the expansion body 200 is provided with inflatable chambers 210 on both sides of the chord line, and the chambers 210 on both sides of the chord line change the compression degree with the swing of the flap 300 to adaptively adjust the reaction force of the expansion body 200 on the flap 300, and make the flap angle sandwiched between the blade body 100 and the flap 300 tend to be stable.

[0030] See also Figure 1The expansion body 200 is provided with inflatable chambers 210 on both sides of the chord, wherein the upper chamber 210 is located above the chord, and the lower chamber 210 is located below the chord. The inflatable chambers 210 on both sides of the chord are filled with gas, and the chambers 210 are compressible as a whole. When the inflatable chambers 210 on both sides of the chord have different inflation pressures, the expansion body 200 forms a bending shape with different curvatures. The expansion body 200 is flexibly connected to the blade body 100 and the flap 300. The flexible body structure formed by the body 200 can form a connection structure with different rotation angles, so that the flap angle maintains a desired angle. The inflatable chambers 210 on both sides of the two chord lines and the wind pressure on the windward surface of the blade exert a combined pressure force on the flap 300 to maintain a balanced stable state. When the windward surface is subjected to a change in wind pressure, the balanced state is destroyed, and the lower chamber 210 close to the windward surface can balance the wind pressure combined force with the inflation pressure of the upper chamber 210 in a compressed state, and the flap 300 swings to a new equilibrium position. The blade in this embodiment can completely passively adjust the flap angle in response to the flow state on the blade surface, and the flap angle can be adjusted without any mechanical or electric actuator or controller.

[0031] The expansion body 200 is made of a flexible material, and the membrane structure of the chamber 210 can be deformed according to the force conditions; preferably, the expansion body 200 is made of an elastic material, specifically rubber or elastic plastic, and when the gas is pressurized, the surface of the chamber 210 can shrink along with the compression, so that the outer wall of the chamber 210 always remains in a stretched state.

[0032] refer to Figure 1-7 The air pressure in the upper inflatable chamber 210 located on the upper side of the chord line is greater than the pressure in the lower inflatable chamber 210 located on the lower side of the chord line, so that the entire expansion body 200 is forced to bend downward, and then the entire flexible connection structure is bent downward. When the blade is working, when the wind force is strong, the flexible connection structure will be affected by the wind force and will bend upward, so that the flap angle is reduced to ensure the stability of the entire blade. When the wind force decreases, the flexible connection structure will be affected by the pressure difference between the chambers 210 on both sides and will bend downward, so that the flap angle is increased, which will increase the operating efficiency of the blade at low wind speeds and has the effect of increasing efficiency and stability.

[0033] In some embodiments, the inflatable chambers 210 on both sides of the two chords can be connected to an inflation device, and the pressures of the two chambers 210 in different initial states can be adjusted by actively "inflating" or "deflation" the volume, so that the flexible connection structure has different initial bending stiffnesses to adjust the response torque and response speed of the flap angle change.

[0034] The behavior of the flap 300 will depend on the rotation speed of the blade and also on the angle of attack in this section of the blade. Since the tangential velocity at a point along the blade depends on the rotation speed of the rotor and the distance of the point from the blade root, the behavior of the flap 300 will also depend on its position along the blade. In some embodiments, the flap 300 includes a plurality of independently movable flap 300 segments arranged in the direction of the span, and an inflatable chamber 210 is arranged on both sides of the chord line of each flap 300 segment. Corresponding to each flap 300 segment, its distance from the blade root is different, and it has different wind pressures, and the flap 300 segments at different distances along the span direction can have different flap angles.

[0035] In some examples, a plurality of chambers (210) are arranged on both sides of the chord from front to back, and the inflation pressure in the chambers 210 along one side of the chord from front to back gradually decreases, so that the chamber 210 adjacent to the flap 300 first responds to the change in the flap angle and changes the degree of gas compression in the chamber 210. It can be understood that in the change in the angle of the expansion body 200, a plurality of chambers 210 are arranged, and the plurality of chambers 210 are independent of each other, so that the local area corresponding to the chamber has a strong air pressure, and the local area can bear pressure independently. The plurality of chambers 210 can respond to the change of the corresponding number of chambers 210 according to the degree of change of different loads, so that the angle change is more continuous and stable, and it is convenient for fine adjustment; when the wind speed is high, the chamber 210 is arranged from the flap 300 to the front side, and the chambers 210 are gradually deformed one by one, so that the entire expansion body 200 forms a bent structure, and when the wind speed is low, the part of the chamber 210 close to the flap 300 is deformed.

[0036] See also Figure 1-2Furthermore, a connection is provided between adjacent chambers 210 on the same side of the chord line through a one-way valve 201 and a pressure relief valve 202. In a stationary state, the pressure of the high-pressure side chamber 210 is higher than that of the low-pressure side chamber 210. During operation, the wind blows onto the flap 300, and the load acts on the flap 300. The pressure of the low-pressure side chamber 210 is low, and deformation begins to occur, and the flap begins to move upward. When the wind speed increases, the wind load increases, the low-pressure side chamber 210 is squeezed, the pressure increases, the gas enters the high-pressure side through the one-way valve 201, and the bending is biased toward the high-pressure side. The high-pressure side bends, the pressure increases, and the wind load size is adaptive. When the wind speed decreases, the load acting on the flap becomes smaller, the force generated by the chamber 210 on the blade is greater than the wind load, the flap begins to bend downward, the high-pressure side chamber 210 first returns to a normal state, and air enters the low-pressure side chamber 210 through the pressure relief valve 202. The low-pressure side chamber 210 also begins to adaptively recover and restore the pressure difference. During operation, the low-pressure side chamber is deformed, and the pressure of the low-pressure side chamber 210 begins to increase to adapt to the wind load. When the pressure of the low-pressure side chamber 210 is greater than that of the high-pressure side chamber 210, the gas in the low-pressure side chamber 210 flows into the high-pressure side through the one-way valve, and the high-pressure side chamber 210 begins to deform to adapt to the wind load. When the wind load decreases, the high-pressure side chamber 210 first restores its original shape, and the low-pressure side high-pressure side chamber 210 is gradually restored through the pressure relief valve 202. When the pressure of the low-pressure side chamber 210 is lower than that of the high-pressure side chamber 210, the high-pressure side chamber 210 will inflate the low-pressure side chamber 210 to maintain a certain pressure difference. With this structure, the pressure change can adjust the pressure difference through the one-way valve 201 and the pressure relief valve 202, which can respond more continuously and better adapt to the wind speed changes under natural conditions. In some examples, in order to make the blade body 100 have the characteristics of light weight, high strength, foldability, and quick installation, the blade body 100 includes a first main beam 110 and a second main beam arranged along the wingspan direction, and the proximal ends of the first main beam 110 and the second main beam 120 are connected to the blade root 130. It also includes a first primary beam 150 perpendicular to the direction of the wingspan and arranged along the wingspan direction. The main beam and / or the secondary beam are flexible inflatable membrane structures, and the first primary beam 150 is connected at both ends to the first main beam 110 and the second main beam respectively, wherein the main beam and the secondary beam are connected to form a skeleton structure of the blade body 100, and a plurality of inflatable chambers b are provided on the surface of the skeleton structure. The inflatable chambers b can be made of flexible materials, and the outer walls of the plurality of inflatable chambers b form the wing surface of the blade body 100. By inflation, the first main beam 110 and the second main beam 120 can form a stable load-bearing structure to withstand all or most of the bending moment and shear force. By keeping them in an uninflated state during transportation, they can have the advantages of being small and foldable. During installation, they can be quickly installed by inflation.

[0037] In some embodiments, the main beam includes a first inflatable column a, a second inflatable column a is centrally arranged inside the first inflatable column a, at least three inflatable columns a are arranged in the annular space between the first inflatable column a and the second inflatable column a, and the inflatable column a is made of a film. Figure 1-2 The first main beam 110 and the second main beam 120 provide support for the entire blade. The entire first main beam 110 and the second main beam 120 are composed of 8 inflatable columns a. Each inflatable column a can be composed of two layers, and the gaps between the films are filled with flexible filling materials. Each air column is inflated to 100Mpa to support the entire flexible blade.

[0038] refer to Figure 1-2 The secondary beam 5 provides support for the entire blade, and the inflation reaches 60MPa. The inflation chamber b can be built on the secondary beam 5 to maintain the strength of the entire blade. The inflation ports of the first main beam 110 and the second main beam 120 are set on the blade root 130, and the inflation port of the third main beam 220 is set on the blade root 130. By inflating the blade root 130, the main beam can quickly form a skeleton structure.

[0039] Similarly, in some embodiments, the flap 300 includes a third main beam 220 arranged along the wingspan direction and a secondary beam 240 arranged perpendicular to the wingspan direction and arranged along the wingspan direction, the front end of the secondary beam 240 is connected to the third main beam 220, the main beam or / and the secondary beam are flexible inflatable structural membrane structures, wherein the front end of the secondary beam 240 is connected to the third main beam 220 to form a flap 300 skeleton structure, and a plurality of inflatable chambers b are provided on the surface of the flap 300 skeleton structure, and the outer wall surfaces of the plurality of inflatable chambers b form the wing surface of the flap 300. Reference Figure 1-2 The third main beam 220 selects 5 inflatable columns a, which are inflated to 100Mpa. The inflatable columns a are made of film, and the gaps between the films are filled with flexible filling materials. Through inflation, the third main beam 220 and the secondary beam 240 can form a stable load-bearing structure to withstand all or most of the bending moment and shear force. During transportation, by keeping it in an uninflated state, it can have the advantages of small size and foldability. During installation, it can be quickly installed through inflation.

[0040] In some embodiments, the several inflatable chambers b laid on the skeleton structure are connected to the adjacent secondary beams through the connection ports provided with the one-way valves 201. The secondary beams may also have multiple columnar chambers. The chambers or all the chambers of the entire secondary beam may also be used as inflatable pipelines. The one-way valves 201 can make the gases in the several inflatable chambers b independent of each other, so that the inflatable chambers b can bear pressure independently, and of course, it can also prevent local damage from causing the destruction of the entire structure. Figure 3As shown, further, a structure of a one-way valve, the one-way valve 201 includes two leaflets c, the edges of the two leaflets c extend along the air inlet direction and close together in the middle. When inflating, the airflow at the upstream end of the leaflets c is under high pressure, causing the two leaflets c to open and inflate the inflation chamber b. After inflation, when the air pressure at the upstream end of the two leaflets c is relatively small, the edges of the two leaflets c extend along the air inlet direction and close together in the middle to achieve the closure of the inflation chamber b. With this structure, the one-way valve 201 has a simple structure and low cost, and can be made of flexible materials for easy storage.

[0041] The present invention is relative to conventional non-adjustable blades, see Figure 7 For example, due to natural changes in wind or due to the operating state of the wind turbine, the angle of attack decreases, and the flap angle between the blade body 100 and the flap 300 is automatically changed according to the difference between the pressure difference between the two air chambers and the wind pressure on the windward surface. The passive adjustment of the air chamber can achieve a higher lift coefficient, resulting in a corresponding increase in lift, so that the wind turbine can extract more energy from the wind. Figure 4-7 In the flow field simulation of the blade at an angle of attack of 18°, the wind speed adaptively adjusts the degree of curvature of the trailing edge to further stabilize the operation of the wind turbine.

[0042] By adopting the present invention, at low wind speed, the improved trailing edge flexible structure presents a curved state, such as Figure 4 At low wind speeds, the streamlines of the original airfoil blade are shown in Figure 5. At low wind speeds, the trailing edge of the improved blade is in a curved state, which can better absorb energy from the wind. At high wind speeds, the flexible structure of the trailing edge bends upward, as shown in Figure 5. Figure 6 At high wind speeds, the overall streamline of the blade is stable. At the same time, due to the adaptive characteristics of the flexible structure, it can change with the flow conditions compared to fixed devices such as vortex generators. The range of stall suppression is wider, the blade stall zone is greatly reduced, and the blade aerodynamic stability is greatly increased.

[0043] Comparison of lift coefficient between the improved airfoil and the original airfoil at an angle of attack of 10° Figure 7As shown below; the downward deflection of the flexible structure makes the trailing edge bend, increases the rear loading of the airfoil, and is equivalent to reducing the angle of attack under the same design lift coefficient. The reduction in the angle of attack shortens the airflow acceleration zone near the head of the upper wing, reduces the negative pressure peak, and brings the upper wing shock wave closer to the leading edge. The downward deflection of the trailing edge increases the expansion speed of the airflow flowing through the trailing edge of the upper wing, which increases the gradient of the recovery of the trailing edge pressure coefficient. Combining the above reasons, the downward deflection of the flexible structure increases the rear loading and improves the lift on the one hand, and weakens the shock wave intensity of the upper wing on the other hand, thereby reducing the wave resistance. The blade of the present invention can respond to changes in the flap angle, and the response to changes in the flap angle is completely passive. During operation at a given rotation speed, the lift coefficient of the airfoil section is directly related to the angle of attack, which will increase the operating efficiency of the blade at low wind speeds and has the effect of increasing efficiency and stability. The present invention has significantly lower manufacturing and maintenance costs, and has the characteristics of light weight, high strength, foldability, and quick installation.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A flexible vibration adaptive wind turbine blade, characterized in that: The invention comprises a blade body (100), the trailing edge of the blade body (100) being flexibly connected to a flap (300) via an inflatable expansion body (200), the expansion body (200) being provided with inflatable chambers (210) on both sides of a chord line, the chambers (210) on both sides of the chord line changing their compression degrees as the flap (300) swings, so as to adaptively adjust the reaction force of the expansion body (200) on the flap (300), and making the flap angle between the blade body (100) and the flap (300) tend to be stable.

2. The flexible vibration adaptive wind turbine blade according to claim 1, characterized in that: The blade body (100) comprises a first main beam (110) and a second main beam arranged along the wingspan direction, the proximal ends of the first main beam (110) and the second main beam are connected to the blade root (130), and also comprises a first primary beam (150) arranged perpendicular to the wingspan direction and along the wingspan direction, the main beam and / or the secondary beam are flexible inflatable membrane structures, and the first primary beam (150) is connected at both ends to the first main beam (110) and the second main beam, wherein the main beam and the secondary beam are connected to form a skeleton structure of the blade body (100), and a plurality of inflatable chambers (b) are provided on the surface of the skeleton structure, and the outer walls of the plurality of inflatable chambers (b) form the wing surface of the blade body (100).

3. The flexible vibration adaptive wind turbine blade according to claim 1, characterized in that: The flap (300) comprises a third main beam (220) arranged along the wingspan direction and a secondary beam (240) arranged perpendicular to the wingspan direction and arranged along the wingspan direction, the front end of the secondary beam (240) is connected to the third main beam (220), the main beam and / or the secondary beam are flexible inflatable structural membrane structures, wherein the front end of the secondary beam (240) is connected to the third main beam (220) to form a flap (300) skeleton structure, and a plurality of inflatable chambers (b) are provided on the surface of the flap (300) skeleton structure, and the outer wall surfaces of the plurality of inflatable chambers (b) form the wing surface of the flap (300).

4. The flexible vibration adaptive wind turbine blade according to claim 2 or 3, characterized in that: The main beam comprises a first inflatable column, a second inflatable column (a) arranged at the center of the first inflatable column, at least three inflatable columns (a) are arranged in the annular space between the first inflatable column and the second inflatable column (a), and the inflatable column (a) is made of a film.

5. The flexible vibration adaptive wind turbine blade according to claim 1, characterized in that: A plurality of chambers (210) are arranged on both sides of the string from front to back.

6. The flexible vibration adaptive wind turbine blade according to claim 5, characterized in that: The inflation pressure in the chamber (210) along one side of the chord line from front to back is gradually reduced, so that the chamber (210) adjacent to the flap (300) first responds to the change in the flap angle and changes the degree of gas compression in the chamber (210).

7. The flexible vibration adaptive wind turbine blade according to claim 6, characterized in that: A communication is provided between adjacent chambers (210) on the same side of the string line through a one-way valve (201) and a pressure relief valve (202).

8. The flexible vibration adaptive wind turbine blade according to claim 2 or 3, characterized in that: A plurality of air-filled chambers (b) laid on the skeleton structure are connected to adjacent secondary beams through connection ports provided with one-way valves (201).

9. The flexible vibration adaptive wind turbine blade according to claim 8, characterized in that: The one-way valve (201) comprises two flaps (c), the edges of which extend along the air intake direction and close together; the expansion body (200) is made of elastic material.

10. The flexible vibration adaptive wind turbine blade according to claim 1, characterized in that: The flap comprises a plurality of independently movable flap sections arranged in a direction along the wingspan direction, and inflatable chambers (210) are arranged on both sides of the chord line of each flap section.

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