Aerodynamic resistance device for a floating wind turbine and floating wind turbine

Abstract

A kind of aerodynamic resistance device for floating wind turbine and floating wind turbine, including left wing and right wing, left wing and right wing are symmetrically fixed on the left and right sides of the cabin of wind turbine, left wing and right wing all include upper shell plate, lower shell plate, internal support beam, leading edge baffle and wing tip winglet, upper shell plate and lower shell plate are buckled into wing body with cavity, internal support beam is arranged in wing body, two ends of wing body are connected with the side of cabin and wing tip winglet respectively, leading edge baffle is rotatably installed on upper shell plate, its rotating shaft is parallel to the extension direction of left wing or right wing, leading edge baffle is connected with the driving mechanism for rotating it around its rotating shaft, to adjust the windward angle of leading edge baffle.The application can increase the wind area of the structure on both sides of cabin, increase aerodynamic resistance, and can adjust wind area according to actual wind condition, to adjust aerodynamic thrust, so as to inhibit the bow movement of wind turbine, realize the purpose of reducing angular displacement and improving power generation, and can ensure the stability of overall structure.

Description

Technical Field

[0001] This invention relates to the field of floating wind power technology, and more particularly to an aerodynamic drag device for a floating wind turbine and a floating wind turbine. Background Technology

[0002] Floating wind power equipment is often deployed in harsh marine environments, where it is subject to the coupling effects of wind, waves, and currents, resulting in six degrees of freedom of motion and making the wind turbine extremely unstable. Roll and pitch motions, in particular, alter the pitch angle of the rotor, affecting its windward performance and consequently reducing the turbine's power output, thus impacting economic viability. This impact is even more pronounced as floating wind power development moves into deeper waters, highlighting the need to find methods to suppress the roll and pitch motions of the turbines. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an aerodynamic drag device for floating wind turbines that can suppress the yaw and pitching motion of wind turbines. By changing the wind-receiving area of ​​the structures on both sides of the nacelle, the aerodynamic drag is increased, thereby increasing the aerodynamic thrust, reducing angular displacement, and increasing power generation when the wind turbine tilts. The invention also provides a floating wind turbine that uses this aerodynamic drag device.

[0004] This invention is achieved through the following technical solution:

[0005] An aerodynamic drag device for a floating wind turbine includes a left wing and a right wing, which are symmetrically fixed to the left and right sides of the wind turbine nacelle and extend to both sides. A horizontal axis impeller is installed at the front end of the wind turbine nacelle. The left and right wings have the same structure, each including an upper shell plate, a lower shell plate, an internal support beam, a leading edge baffle, and winglets. The upper and lower shell plates are perpendicular to the impeller surface of the wind turbine. The upper and lower shell plates are interlocked to form a hollow wing body, which is horizontally positioned. The left and right wings extend towards the left and right sides of the nacelle, respectively. The lateral extension includes an internal support beam housed within the wing body to support the internal cavity. One end of the wing body is fixed to the side of the cabin, and the winglet is fixed to the other end of the wing body. The leading edge baffle is rotatably mounted on the upper shell plate, with its axis of rotation parallel to the extension direction of the left or right wing. The leading edge baffle is connected to a drive mechanism, which drives the leading edge baffle to rotate around its axis of rotation, causing the leading edge baffle to rotate upwards at a certain angle relative to the wing surface, thereby adjusting the windward area of ​​the leading edge baffle.

[0006] Additional winglets are installed on both sides of the wind turbine nacelle to increase aerodynamic drag. When the leading-edge baffles flip up, they further increase aerodynamic drag, achieving rapid deceleration. Different flip angles of the leading-edge baffles correspond to different wind-receiving areas. By changing the opening angle of the leading-edge baffles, the wind-receiving area can be increased, thereby increasing the wind thrust received and suppressing bow tilt.

[0007] Furthermore, the upper shell plate is provided with several openings, and the front edge baffle covers the openings. Each opening corresponds to a front edge baffle, so that the upper shell plate becomes a closed whole when the front edge baffle is closed.

[0008] Furthermore, the drive mechanism includes a hydraulic rod, a liquid pump, a hydraulic cylinder, a liquid tank, and liquid pipelines. The liquid pump and liquid tank are mounted on an internal support beam within the wing body. The liquid tank, liquid pump, and hydraulic cylinder are connected sequentially via the liquid pipelines. One end of the hydraulic cylinder is hinged to the internal support beam, and the other end is connected to one end of the hydraulic rod. The other end of the hydraulic rod is hinged to the back of the leading edge baffle. The liquid pipelines and control lines are arranged along the internal support beam.

[0009] Furthermore, the system also includes attitude sensors mounted on the top of the nacelle to detect the wind turbine's attitude, including pitch and roll angles and acceleration. These attitude sensors are connected to the respective drive mechanisms and are used to adjust the angle of attack of each leading-edge baffle based on the wind turbine's attitude and wind speed. Multiple openings are provided on the upper shell of the wing body, covered by flip-up leading-edge baffles that can be opened by independent drive mechanisms. When the wind turbine tilts, the attitude sensors transmit signals to the main controller. Based on the angular displacement, the main controller issues control commands to the hydraulic pumps of each drive mechanism, causing the leading-edge baffles to rise under hydraulic pressure, increasing the nacelle's drag. The magnitude of the drag is determined by the restoring torque required to return from the tilted position to the equilibrium position, and the angle at which the leading-edge baffles rise can be adjusted according to the wind speed, thereby regulating the aerodynamic drag.

[0010] Furthermore, the wing body is cylindrical, with one end connected to the side of the nacelle and the other end connected to the winglet. The vertical cross-section of the wing body perpendicular to the rotor surface is a horizontal airfoil. The ratio of the maximum width of the airfoil in the horizontal direction to the maximum width in the vertical direction is 4:1.

[0011] As wind absorbs energy and its speed decreases as it passes through the wind turbine, it reaches a low Reynolds number at the nacelle location. To minimize the frontal drag of the wing structure and reduce its impact on the normal operation of the wind turbine, its frontal windward area should be minimized, which can reduce its thickness. Calculations show that its thickness to chord length ratio is approximately 1:4.

[0012] Furthermore, the end of the airfoil closest to the wind turbine rotor is the leading edge of the airfoil, and the end of the airfoil away from the wind turbine rotor is the trailing edge of the airfoil. The curvature of the leading edge of the airfoil is less than that of the trailing edge. The greater the curvature of the curve, the greater the degree of bending, and the more rounded it is; conversely, the less curvature, the more pointed it is. That is, the leading edge of the airfoil is more rounded, and the trailing edge is more pointed. The upper and lower shell plates are symmetrical in shape, and each airfoil body is provided with two internal support beams. The two internal support beams are parallel to the extension direction of the airfoil and penetrate the cavity of the airfoil.

[0013] The upper and lower shell plates are symmetrical in shape, making the wing body vertically symmetrical. This ensures that air travels the same distance along the upper and lower surfaces of the wing body, resulting in the same natural flow velocity. According to Bernoulli's principle, the pressure on the upper and lower surfaces of the wing body is equal, preventing lift generation due to pressure differences and maintaining the overall structural stability of the cabin. Each wing body contains two internal support beams that penetrate the main body of the wing body structure to enhance its structural strength and provide mounting locations for internal equipment.

[0014] Furthermore, the winglet includes an integrally formed connecting part and a winglet. The connecting part is used to connect with the wing body. The winglet extends obliquely upward in a plane parallel to the wind turbine surface, and the direction of extension is gradually away from the nacelle, and it gradually becomes thinner along the upward extension direction.

[0015] At the outer ends of the left and right wing bodies, where there is no longer a separating wing surface, high-pressure airflow rolls along the wingtips. Combined with the inherent rearward flow of the fluid, this creates a spiral vortex motion, known as wingtip vortices. These vortices disturb the overall structure, affecting its stability. By placing winglets at the outer ends of the left and right wing bodies, wingtip vortices can be generated, with their direction opposite to and very close to the main wing's wingtip vortex. Through viscous dissipation, the two vortices intertwine, counteracting each other and thus reducing disturbance.

[0016] Furthermore, the inner side of the winglet has a straight profile in a plane parallel to the wind turbine surface, and the angle between the profile and the vertical line is 15°-20°.

[0017] Furthermore, the winglet includes a bottom surface, a top surface, a leading edge, and a trailing edge. The leading edge is located on the side closer to the wind turbine rotor, and the trailing edge is located on the side away from the wind turbine rotor. The winglet as a whole is a cone that gradually narrows upwards. The horizontal cross-section of the cone is an airfoil. One end of the airfoil corresponds to the leading edge of the winglet, and the other end corresponds to the trailing edge. The curvature of the leading edge is less than the curvature of the trailing edge.

[0018] Furthermore, the leading edge of the winglet extends obliquely upward towards the side away from the wind turbine surface, and the outline of the leading edge of the winglet on the vertical plane perpendicular to the wind turbine surface is a straight line with an angle of 30°-50° between the outline and the vertical line. The trailing edge of the winglet extends vertically upward.

[0019] A floating wind turbine includes a nacelle, a rotor, and the aforementioned aerodynamic drag device for the floating wind turbine. The rotor is connected to the nacelle and its surface is vertically arranged. The aerodynamic drag device is disposed on the nacelle.

[0020] This invention increases the wind-receiving area and aerodynamic drag by incorporating wing structures on both sides of the wind turbine nacelle, thereby suppressing the turbine's tilting motion and increasing power generation. Furthermore, by installing rotatable leading-edge baffles on the wing bodies, the baffles can be opened when the turbine tilts, further increasing the wind-receiving area and aerodynamic drag. Adjusting the opening angle of the leading-edge baffles changes the overall wind-receiving area of ​​the structure, thus regulating aerodynamic thrust and reducing angular displacement, thereby increasing power generation. This invention provides excellent control when the turbine is unstable. Finally, by incorporating winglets on the outer side of the wing bodies and designing their structure accordingly, the invention minimizes the wing bodies' disturbance to airflow and their impact on turbine thrust. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention.

[0022] Figure 2 This is an enlarged schematic diagram of the structure of an embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the left wing in an embodiment of the present invention.

[0024] Figure 4 for Figure 3 Enlarged view of the structure at point A in the middle.

[0025] Figure 5 This is a frontal view of the left wing in an embodiment of the present invention.

[0026] Figure 6 This is a cross-sectional schematic diagram of the wing body in an embodiment of the present invention.

[0027] Figure 7 This is a schematic diagram of the winglet structure in an embodiment of the present invention.

[0028] Figure 8 This is a structural schematic diagram of the winglet from another perspective in an embodiment of the present invention.

[0029] Figure 9 for Figure 8 A structural diagram with some hidden lines added.

[0030] Figure 10 This is a schematic diagram of the side structure of the winglet in an embodiment of the present invention.

[0031] Figure 11 for Figure 10 A schematic diagram of the cross-section along the AA direction.

[0032] Reference numerals: 1-Left wing; 2-Right wing; 3-Wing body; 11-Upper shell plate; 12-Lower shell plate; 13-Internal support beam; 14-Winglet; 15-Leading edge baffle; 16-Drive mechanism; 141-Connecting part; 142-Winglet; 161-Hydraulic cylinder; 162-Hydraulic rod; 31-Wing body leading edge; 32-Wing body trailing edge; 1421-Winglet bottom surface; 1422-Winglet top surface; 1423-Winglet leading edge; 1424-Winglet trailing edge; 10-Nacelle; 20-Wind rotor. Detailed Implementation

[0033] An aerodynamic drag device for floating wind turbines, such as Figure 1 , Figure 2 The wind turbine nacelle 10 includes a left wing 1 and a right wing 2, which are symmetrically fixed on the left and right sides of the nacelle 10 and extend to both sides. A horizontal axis impeller 20 is installed at the front end of the nacelle 10 and can be connected by welding. The left wing 1 and the right wing 2 have the same structure. Taking the left wing 1 as an example, both include an upper shell plate 11, a lower shell plate 12, an internal support beam 13, a leading edge baffle 15, and a winglet 14. The upper shell plate 11 and the lower shell plate 12 are perpendicular to the impeller surface of the wind turbine. The upper shell plate 11 and the lower shell plate 12 are interlocked to form a wing body 3 with a cavity. The wing body 3 is horizontally arranged, and the left and right wings 3 extend to the left and right sides of the nacelle 10, respectively. The internal support beam 13 is set inside the wing body 3 and plays the role of supporting the internal cavity. One end of the wing body 3 is connected and fixed to the side of the nacelle 10, and the winglet 14 is connected and fixed to the other end of the wing body 3. The upper shell plate 11 and the lower shell plate 12 can be integrally formed, welded together, or bolted together.

[0034] At the outer ends of the left and right wing bodies 3, where there is no longer a wing surface separating them, high-pressure airflow rolls along the wingtips. Combined with the inherent rearward flow of the fluid, this creates a spiral vortex motion, known as wingtip vortices. These vortices disturb the overall structure, affecting its stability. By installing winglets 14 at the outer ends of the left and right wing bodies 3, wingtip vortices can be generated, with their direction opposite to and very close to the main wing's wingtip vortex. Through viscous dissipation, the two vortices intertwine, counteracting each other and thus reducing disturbance.

[0035] In this embodiment, as Figure 2 , Figure 3The leading edge baffle 15 is rotatably mounted on the upper shell plate 11, with its axis of rotation parallel to the extension direction of the left wing 1 or the right wing 2. The leading edge baffle 15 is connected to a drive mechanism 16, which drives the leading edge baffle 15 to rotate around its axis, causing the leading edge baffle 15 to rotate upwards at a certain angle relative to the wing surface, thereby adjusting the windward area of ​​the leading edge baffle 15. Figure 3 , Figure 4 As shown, the leading edge baffle 15 is hinged to the upper shell plate 11.

[0036] Additional wing bodies 3 are installed on both sides of the wind turbine nacelle 10 to increase aerodynamic drag. When the leading edge baffle 15 flips up, it further increases aerodynamic drag, achieving rapid deceleration. Different flip angles of the leading edge baffle 15 correspond to different wind-receiving areas. By changing the opening angle of the leading edge baffle 15, the wind-receiving area can be increased, thereby increasing the wind thrust received and suppressing bow tilt.

[0037] To further improve the flexibility of wind-receiving area adjustment, multiple leading edge baffles 15 can be provided. Specifically, the upper shell plate 11 is provided with several openings, and the leading edge baffles 15 cover the openings, with one opening corresponding to one leading edge baffle 15, so that the upper shell plate 11 becomes a closed whole when the leading edge baffles 15 are closed. In this embodiment, each upper shell plate 11 is provided with two leading edge baffles 15, and the upper shell plate 11 corresponds to two openings.

[0038] The driving mechanism 16 drives the leading edge baffle 15 to rotate, and can be an existing structure or form, such as a rotary drive motor, rotary cylinder, electric telescopic rod, telescopic cylinder, etc. As one embodiment, for example... Figure 4 The drive mechanism 16 includes a hydraulic rod 162, a liquid pump, a hydraulic cylinder 161, a liquid tank, and liquid pipelines. The liquid pump and liquid tank are mounted on an internal support beam 13 within the wing body 3. The liquid tank, liquid pump, and hydraulic cylinder 161 are connected sequentially via the liquid pipelines. One end of the hydraulic cylinder 161 is hinged to the internal support beam 13, and the other end is connected to one end of the hydraulic rod 162. The other end of the hydraulic rod 162 is hinged to the back of the leading edge baffle 15. The liquid pipelines and control lines are arranged along the internal support beam 13.

[0039] To improve the automation of control, an attitude sensor is also included. This attitude sensor, which can be installed on top of the wind turbine nacelle, is used to detect the wind turbine's attitude, including pitch and roll angles and acceleration. The attitude sensor is connected to each of the drive mechanisms 16 and is used to adjust the windward angle of each leading-edge baffle 15 according to the wind turbine's attitude and wind speed. Wind speed, wind direction, and other wind condition indicators can be obtained from sensors typically installed on the wind turbine. Multiple openings are provided on the upper shell plate 11 of the wing body 3, covered by flip-up leading-edge baffles 15, which can be opened by independent drive mechanisms 16. When the wind turbine tilts, the wind turbine attitude sensor transmits a signal to the main controller. Based on its angular displacement, the main controller issues control commands to the liquid pumps of each drive mechanism 16, causing the leading-edge baffles 15 to rise under the drive of hydraulic rods 162, increasing the drag of the nacelle 10. The magnitude of the drag is determined by the restoring torque required to return from the tilted position to the equilibrium position. The angle at which the leading-edge baffles 15 rise can be adjusted according to the wind speed, thereby regulating the aerodynamic drag. For example, if the wind turbine is detected to be tilted forward in the longitudinal section direction, the thrust should be increased as much as possible to restore the wind turbine to its initial equilibrium position or reduce the tilt angle. At this time, the leading edge baffle 15 can be opened. If the nacelle is detected to be making violent reciprocating motion, the windward angle of the leading edge baffle 15 should also be increased to increase the starting damping and suppress the motion.

[0040] In one embodiment, the wing 3 is columnar, with one end connected to the side of the nacelle 10 and the other end connected to the winglet 14. The columnar shape has a horizontal airfoil with its vertical cross-section parallel to the nacelle 10 (i.e., the vertical cross-section perpendicular to the rotor surface). Figure 6 The ratio of the maximum horizontal width L to the maximum vertical width H of the airfoil is 4:1. Since the wind absorbs energy as it passes through the rotor 20, its speed decreases accordingly, reaching a low Reynolds number at the nacelle 10 position. To minimize the frontal drag of the wing 142 structure and reduce the impact of the wing 3 structure on the normal operation of the rotor, its frontal windward area should be minimized, which can reduce its thickness. Calculations show that its thickness to chord length ratio is approximately 1:4.

[0041] like Figure 3 , Figure 6The airfoil's leading edge 31 is located near the wind turbine rotor, while its trailing edge 32 is located away from the rotor. The curvature of the leading edge 31 is less than that of the trailing edge 32. A greater curvature indicates a greater degree of bending and a smaller radius of curvature; that is, the leading edge 31 is more rounded, and the trailing edge 32 is more pointed, with the rounded end closer to the rotor surface. In this embodiment, the upper shell plate 11 and lower shell plate 12 are symmetrical in shape, making the airfoil 3 vertically symmetrical. This ensures that air travels the same distance along the upper and lower surfaces of the airfoil 3, resulting in the same natural flow velocity. According to Bernoulli's theorem, the pressure on the upper and lower surfaces of the airfoil 3 is equal, preventing lift due to pressure differences and maintaining the overall structural stability of the nacelle 10. Each airfoil 3 contains two internal support beams 13, parallel to the extension direction of the airfoil 3 and penetrating the cavity of the airfoil 3 structure to enhance its structural strength and provide installation positions for internal equipment.

[0042] like Figure 5 The winglet 14 includes an integrally formed connecting portion 141 and a winglet 142. The connecting portion 141 is used to connect to the wing body 3. The winglet 142 extends obliquely upward in a plane parallel to the wind turbine surface, gradually moving away from the nacelle, and gradually thins along the upward direction. The main function of the winglet 142 on the winglet 14 is to dissipate the vortices caused by the size reduction of the wingtip, thereby reducing load disturbance. Based on structural calculations, the rear view of the left wing... Figure 5 For example, the outline of the inner side of the winglet 142 is roughly a straight line, and the angle α between the outline and the vertical line is about 15°-20°.

[0043] Figures 7 to 11 The structure and shape of the winglet 142 in this embodiment are shown. Specifically, the winglet 142 includes a bottom surface 1421, a top surface 1422, a leading edge 1423, and a trailing edge 1424. The leading edge 1423 is located on the side closer to the wind turbine rotor, and the trailing edge 1424 is located on the side away from the wind turbine rotor. The winglet 142 is generally a cone that gradually narrows upwards. The area of ​​the bottom surface 1421 is larger than the area of ​​the top surface 1422. The horizontal cross-section of the cone is an airfoil (see [reference]). Figure 7 , Figure 9 , Figure 11 One end of the airfoil corresponds to the leading edge 1423 of the winglet, and the other end corresponds to the trailing edge 1424 of the winglet, as shown below. Figure 11 As shown, the curvature of the leading edge 1423 of the winglet is less than the curvature of the trailing edge 1424 of the winglet, that is, the leading edge 1423 of the winglet is more rounded than the trailing edge 1424 of the winglet, and the trailing edge 1424 of the winglet is approximately an acute angle.

[0044] Viewed from the vertical direction perpendicular to the wind turbine surface, as Figure 10As shown, the leading edge 1423 of the winglet extends obliquely upward towards the side away from the rotor surface (see also reference). Figure 8 , Figure 9 The leading edge 1423 of the winglet has a roughly straight profile on a vertical plane perpendicular to the wind turbine surface, with an angle β of approximately 30°-50° between the profile and the vertical line. The trailing edge 1424 of the winglet is basically vertically upward. The overall structure of the winglet 142 reduces airflow disturbance while minimizing its impact on the normal operation of the wind turbine.

[0045] The connecting part 141 has a bent structure, with one end connected to the horizontally arranged wing 3 and the other end connected to the obliquely upward-arranged winglet 142. For details, please refer to [reference needed]. Figure 5 , Figure 7 This can be achieved by using a hollow structure composed of shell plates for both the connecting part 141 and the winglet 142 to reduce weight.

[0046] A floating wind turbine includes a nacelle 10, a rotor 20, and the aforementioned aerodynamic drag device for the floating wind turbine. The rotor 20 is connected to the nacelle 10 and is vertically oriented. The aerodynamic drag device is mounted on the nacelle 10. The rotor 20 can be a common three-bladed horizontal axis rotor.

[0047] The above detailed description is a specific description of feasible embodiments of the present invention. These embodiments are not intended to limit the patent scope of the present invention. All equivalent implementations or modifications that do not depart from the present invention should be included in the patent scope of this case.

Claims

1. An aerodynamic drag device for a floating wind turbine, characterized in that, The device includes a left wing and a right wing, which are symmetrically fixed to the left and right sides of the wind turbine nacelle and extend to both sides. A horizontal axis wind turbine is installed at the front end of the wind turbine nacelle. The left and right wings have the same structure, each including an upper shell plate, a lower shell plate, an internal support beam, a leading edge baffle, and winglets. The upper shell plate and the lower shell plate are fastened together to form a wing body with a cavity. The wing body is horizontally arranged, and the internal support beam is arranged in the wing body to support the internal cavity. One end of the wing body is connected and fixed to the side of the nacelle, and the winglets are connected and fixed to the other end of the wing body. The leading edge baffle is rotatably mounted on the upper shell plate, and its axis of rotation is parallel to the extension direction of the left or right wing. The leading edge baffle is connected to a drive mechanism, which is used to drive the leading edge baffle to rotate around its axis of rotation to adjust the windward area of ​​the leading edge baffle. The wing body is cylindrical, with one end connected to the side of the nacelle and the other end connected to the winglet. The vertical section of the column perpendicular to the wind turbine surface is a horizontal airfoil. The ratio of the maximum width of the airfoil in the horizontal direction to the maximum width in the vertical direction is 4:

1. The end of the airfoil closest to the wind turbine rotor is the leading edge of the airfoil, and the end of the airfoil away from the wind turbine rotor is the trailing edge of the airfoil. The curvature of the leading edge of the airfoil is less than the curvature of the trailing edge of the airfoil. The upper shell plate and the lower shell plate are symmetrical in shape. Each airfoil body is provided with two internal support beams. The two internal support beams are parallel to the extension direction of the airfoil and penetrate the cavity of the airfoil. The winglet includes an integrated connecting part and a winglet. The connecting part is used to connect with the wing body. The winglet extends obliquely upward in a plane parallel to the wind turbine surface, and the direction of extension is gradually away from the nacelle, and it gradually becomes thinner along the upward extension direction. The inner side of the winglet has a straight profile in a plane parallel to the wind turbine surface, and the angle between the profile and the vertical line is 15°-20°. The winglet includes a bottom surface, a top surface, a leading edge, and a trailing edge. The leading edge is located on the side closer to the wind turbine rotor, and the trailing edge is located on the side away from the wind turbine rotor. The winglet as a whole is a cone that gradually narrows upwards. The horizontal cross-section of the cone is an airfoil. One end of the airfoil corresponds to the leading edge of the winglet, and the other end corresponds to the trailing edge of the winglet. The curvature of the leading edge of the winglet is less than the curvature of the trailing edge. The leading edge of the winglet extends obliquely upward towards the side away from the wind turbine surface. The outline of the leading edge of the winglet on the vertical plane perpendicular to the wind turbine surface is a straight line, and the angle between the outline and the vertical line is 30°-50°. The trailing edge of the winglet extends vertically upward.

2. The aerodynamic drag device for a floating wind turbine according to claim 1, characterized in that, The upper shell plate is provided with several openings, and the leading edge baffle covers the openings. Each opening corresponds to one leading edge baffle, so that the upper shell plate becomes a closed whole when the leading edge baffle is closed. The drive mechanism includes a hydraulic rod, a liquid pump, a hydraulic cylinder, a liquid tank, and liquid pipelines. The liquid pump and liquid tank are set on the internal support beam inside the wing body. The liquid tank, liquid pump, and hydraulic cylinder are connected in sequence through the liquid pipelines. One end of the hydraulic cylinder is hinged to the internal support beam, and the other end is connected to one end of the hydraulic rod. The other end of the hydraulic rod passes through the opening and is hinged to the back of the leading edge baffle.

3. The aerodynamic drag device for a floating wind turbine according to claim 1, characterized in that, It also includes an attitude sensor, which is installed on the top of the nacelle to detect the attitude of the wind turbine. The attitude of the wind turbine includes the pitch angle, roll angle and acceleration. The attitude sensor is connected to each of the drive mechanisms to adjust the windward angle of each leading edge baffle according to the wind turbine's attitude and wind speed.

4. A floating wind turbine, characterized in that, It includes a nacelle, a wind turbine, and an aerodynamic drag device for a floating wind turbine as described in any one of claims 1 to 3, wherein the wind turbine is connected to the nacelle and the wind turbine surface is vertically arranged, and the aerodynamic drag device is arranged on the nacelle.

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