Large vertical axis wind turbine with bidirectional automatic telescopic cylindrical vortex generator

Abstract

A row of holes are formed in each of the upper surface and the lower surface of a blade of the large vertical axis wind turbine, the two ends of a bearing plate are connected to the two parallel side faces of the blade respectively, and cylindrical vortex generator assemblies are arranged on the two sides of the bearing plate. Each cylindrical vortex generator assembly comprises a cylindrical vortex generator mounting plate, a plurality of cylindrical vortex generators, a driving mechanism and a guide mechanism, and the driving mechanisms are used for driving the cylindrical vortex generator mounting plates to move so that the cylindrical vortex generators can move in the holes in the corresponding positions; the guide mechanism is arranged on the bearing plate so as to limit the sliding direction of the cylindrical vortex generator mounting plate and prevent moving position errors, the extending length of the cylindrical vortex generator can be adjusted according to the size of the attack angle, accordingly, vortex matched with the cylindrical vortex generator is generated, the aerodynamic performance of the blade at different attack angles is optimized, and the service life of the blade is prolonged. Therefore, the comprehensive performance of the blade in the whole operation process is improved.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbines, in particular to a large vertical axis wind turbine with a bidirectional automatic telescopic cylindrical vortex generator. Background Art

[0002] Nowadays, all kinds of energy in the world are facing huge challenges. All kinds of energy are close to scarcity and non-renewable. In order to meet this challenge, countries around the world are striving to develop the use of renewable resources, such as solar energy, wind energy, hydropower, geothermal energy and other renewable energy sources. Wind turbines are the embodiment of wind energy utilization. Now in some remote mountains, you can see huge windmills erected on the top of the mountain. They use wind energy to drive the blades to rotate and turn into mechanical energy, which can be transformed into the electrical energy we need through some technical changes. There are two types of wind turbines. According to the direction of the wheel shaft, they can be divided into horizontal axis wind turbines and vertical axis wind turbines. Horizontal axis wind turbines: The wind rotor shaft of this type of generator is horizontal, and usually needs to face the wind direction to achieve optimal efficiency. They are usually more efficient, but may need to adjust the direction when the wind direction changes. Vertical axis wind turbines: The wind rotor shaft of this type of generator is vertical, and can receive wind from any direction, without the need for a wind system.

[0003] During the operation of the wind turbine blades of a vertical axis wind turbine, the angle of attack will constantly change due to factors such as wind speed, wind direction, and control strategy. A suitable angle of attack can enable the blades to obtain good lift, but an angle of attack that is too large or too small will affect the performance of the blades. However, it is difficult for the existing vertical axis wind turbine blades to adapt to the changes in different blade angles of attack in real time according to wind speed and direction during operation, making it difficult to ensure the aerodynamic performance of the blades at different angles of attack, resulting in a low efficiency of the vertical axis wind turbine in capturing wind energy. Summary of the invention

[0004] The purpose of the present invention is to provide a large vertical axis wind turbine with a bidirectional automatic telescopic cylindrical vortex generator, so that the vertical axis wind turbine has a higher efficiency.

[0005] The technical solution of the present invention is:

[0006] A large vertical axis wind turbine with a bidirectional automatic retractable cylindrical vortex generator, a row of holes are opened on the upper surface and the lower surface of the blade of the vertical wind turbine, a bearing plate is arranged inside the blade, and the two ends of the bearing plate are respectively connected to the two parallel side surfaces of the blade; cylindrical vortex generator components are arranged on the two plate surfaces of the bearing plate, and the two cylindrical vortex generator components are symmetrically arranged, one of the cylindrical vortex generator components is close to the upper surface of the blade, and the other cylindrical vortex generator component is close to the lower surface of the blade, and each cylindrical vortex generator component includes: a cylindrical vortex generator mounting plate, parallel to the bearing plate ; Multiple cylindrical vortex generators, all of which are cylindrical structures, are arranged on the plate surface of the cylindrical vortex generator mounting plate away from the bearing plate, and the multiple cylindrical vortex generators are evenly spaced, and the multiple cylindrical vortex generators correspond to the multiple holes one by one; a driving mechanism is connected between the cylindrical vortex generator mounting plate and the bearing plate, and is used to drive the cylindrical vortex generator mounting plate to move so that the cylindrical vortex generator moves in the holes at the corresponding positions; a guiding mechanism is arranged on the bearing plate, and the cylindrical vortex generator mounting plate is slidably matched on the guiding mechanism to limit the sliding direction of the cylindrical vortex generator mounting plate. Prevent the occurrence of moving position error. By effectively controlling the boundary layer separation and optimizing the aerodynamic performance of the blade, the bidirectional automatic telescopic cylindrical vortex generator can increase the lift coefficient of the blade, so that the wind turbine can capture more wind energy under the same wind speed and blade speed. At the same time, during the operation of the blade, the angle of attack will change continuously due to factors such as wind speed, wind direction and control strategy. The appropriate angle of attack can enable the blade to obtain good lift, but an angle of attack that is too large or too small will affect the performance of the blade. The bidirectional automatic retractable vortex generator of this embodiment can automatically adjust the extension length according to the change of the blade angle of attack, generate vortices adapted thereto, and optimize the aerodynamic performance of the blade at different angles of attack, thereby improving the comprehensive performance of the blade during the entire operation process.

[0007] Furthermore, the guide mechanism includes: two guide rods, each of which is vertically arranged on the supporting plate, and grooves are opened on the opposite sides of the two guide rods, and the grooves are opened along the length direction of the guide rods; two roller assemblies are respectively arranged at the two ends of the cylindrical vortex generator mounting plate, each roller assembly includes a bracket and a roller configured on the bracket, the bracket is connected to the cylindrical vortex generator mounting plate, the roller cooperates with the groove, and the roller moves linearly in the groove through the movement of the cylindrical vortex generator mounting plate.

[0008] Furthermore, the driving mechanism uses a hydraulic driving system, the hydraulic cylinder base of the hydraulic driving system is connected to the bearing plate, and the hydraulic rod of the hydraulic cylinder is connected to the cylindrical vortex generator mounting plate. In this case, the hydraulic drive has fast response speed, timely response, can perform stepless movement, and the hydraulic components can be connected over long distances and can be arranged in different positions.

[0009] Furthermore, the vortex generator plate moves with the movement of the hydraulic rod, and the maximum stroke of the hydraulic rod in the hydraulic cylinder is 1% of the chord length. The maximum stroke of the hydraulic rod is the maximum height of the cylindrical vortex generator extending out of the airfoil surface.

[0010] Furthermore, it also includes a control system and a wind direction sensor. The wind direction sensor is installed at the top of the tower and is used to collect the direction of the incoming flow and transmit the wind direction signal to the control system. The control system is connected to the driving mechanism and is used to control the movement of the driving mechanism when the wind turbine airfoil is at different angles of attack.

[0011] Furthermore, in order to reduce the overall mass of the blade, the cylindrical vortex generator mounting plate and the cylindrical vortex generator are made of aluminum alloy material, and the cylindrical vortex generator is a hollow cylinder.

[0012] Furthermore, when the cylindrical vortex generator is not extended out of the hole, the end surface of the cylindrical vortex generator and the airfoil surface form a smooth curve.

[0013] Furthermore, a spatial rectangular coordinate system is established with the chord formed by the line connecting the leading edge and the trailing edge of the airfoil blade as the X-axis, the vertical direction of the two parallel surfaces of the airfoil blade as the Y-axis, and the plane direction perpendicular to the X-axis and the Y-axis as the Z-axis. The cylindrical vortex generator mounting plate is perpendicular to the two parallel surfaces of the airfoil blade, and the width of the cylindrical vortex generator is perpendicular to the surface formed by the Y-axis and the Z-axis. The length of the cylindrical vortex generator mounting plate is 80% b, where b is the vertical distance between the two parallel sides of the airfoil blade. In order to facilitate the installation of the guide To the rod, the two end faces of the cylindrical vortex generator mounting plate and the two parallel sides of the airfoil blade leave a space of 10%b respectively, and the width of the cylindrical vortex generator mounting plate is greater than the diameter of the cylindrical vortex generator; for example, the width of the cylindrical vortex generator mounting plate is 6% of the chord length, and the chord length refers to the length of the line connecting the leading edge and the trailing edge; the interval between two adjacent cylindrical vortex generators is 2%-3% of the chord length, and the diameter of the cylindrical vortex generator is 2% of the chord length, so as to achieve a relatively high efficiency in suppressing airflow separation. The length of the cylindrical vortex generator can make it form a smooth curved surface with the airfoil surface when it is not working.

[0014] Furthermore, the position of the holes is 15%-20% away from the leading edge in the X-axis direction with the leading edge of the blade as the starting point, the center of the vortex generator located at the edge of the vortex generator plate is 5%b away from the end surface of the plate, and the multiple holes are in a straight line along the Y-axis direction, and the axes of the holes on the upper surface of the blade are coaxial with the axes of the holes on the lower surface of the blade.

[0015] Furthermore, the width and height of the bearing plate are the same as those of the cylindrical vortex generator mounting plate, the length of the bearing plate is the vertical distance b between the two parallel sides of the blade, and the height position of the bearing plate in the blade is the midpoint of the line connecting the centers of the upper and lower holes of the airfoil.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] Solved the problem of low energy capture capability:

[0018] During the operation of the wind turbine blade of the present invention, the bidirectionally automatically retractable vortex generator can automatically adjust the extension length according to the change of the blade attack angle, generate vortices adapted thereto, and optimize the aerodynamic performance of the blade at different attack angles, thereby improving the comprehensive performance of the blade during the entire operation process. At the same time, the bidirectionally automatically retractable cylindrical vortex generator generates vortices to control the boundary layer by extending or retracting a suitable length under different wind speeds, wind directions, and blade attack angles. By effectively controlling the boundary layer separation and optimizing the aerodynamic performance of the blade, the lift coefficient of the blade is increased, so that the wind turbine can capture more wind energy under the same wind speed and blade rotation speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the internal structure of the blade of the present invention.

[0020] Figure 2 It is a partially enlarged schematic diagram of the guide mechanism structure of the present invention.

[0021] Figure 3 It is a partially enlarged schematic diagram of the driving device structure of the present invention.

[0022] Figure 4 It is a schematic diagram of the hole position structure of the present invention.

[0023] Figure 5 This is a schematic diagram of the position of the cylindrical vortex generator of the present invention.

[0024] Figure 6 It is a schematic structural diagram of a cylindrical vortex generator mounting plate, a cylindrical vortex generator, a driving mechanism and a roller assembly of the present invention.

[0025] Figure 7 It is a schematic diagram of the structure of the cylindrical vortex generator of the present invention after extending out of the hole.

[0026] Figure 8 This is a structural schematic diagram of the present invention in which, during the working process of the blade, as the blade attack angle increases, the hydraulic cylinder on one side works to drive the cylindrical vortex generator to extend.

[0027] Fig. 9 This is a schematic diagram of the extension length of the cylindrical vortex generator when there is an incoming flow on one side and the blades are at different positions (angles of attack) of the present invention.

[0028] Fig.10 Schematic diagram of the blade chord line of the present invention.

[0029] Among them, 1. hole, 2. bearing plate, 3. cylindrical vortex generator mounting plate, 4. cylindrical vortex generator, 5. driving mechanism, 6. guide mechanism, 61. guide rod, 62. roller assembly. DETAILED DESCRIPTION

[0030] Combine the following Figures 1 to 10 , the specific embodiments of the present invention are described in detail. In the description of the present invention, 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 drawings, and are only for the convenience of describing the present invention 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 limiting the present invention.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0032] It should be noted that the pipeline connection of the hydraulic system and the circuit connection of the control system involved in the present invention both adopt conventional connection methods and do not involve any innovation.

[0033] Example

[0034] The blades in this embodiment are NACA series blades, and are NACA0025 blades. There are no obvious protrusions and depressions on the surface of the blades. Its upper and lower surfaces are symmetrical blades. The blades also have a certain thickness, and the maximum thickness is 25% of the airfoil length. The outer surface roughness of the blades is small, and the blade frame itself is firm and does not deform.

[0035] like Figure 1As shown, a large vertical axis wind turbine with bidirectional automatic retractable cylindrical vortex generators is provided. A row of holes 1 are opened on the upper and lower surfaces of the blades of the vertical wind turbine. A bearing plate 2 is provided inside the blade, and the two ends of the bearing plate 2 are respectively connected to two parallel side surfaces of the blade; cylindrical vortex generator assemblies are provided on both plate surfaces of the bearing plate 2, and the two cylindrical vortex generator assemblies are symmetrically arranged, wherein one cylindrical vortex generator assembly is close to the upper surface of the blade, and the other cylindrical vortex generator assembly is close to the lower surface of the blade, as shown in FIG. Figure 1 and Figure 6 As shown, each cylindrical vortex generator assembly includes: a cylindrical vortex generator mounting plate 3, a plurality of cylindrical vortex generators 4, a driving mechanism 5 and a guiding mechanism 6, the cylindrical vortex generator mounting plate 3 is parallel to the bearing plate 2; the plurality of cylindrical vortex generators 4 are all cylindrical structures, arranged on the plate surface of the cylindrical vortex generator mounting plate 3 away from the bearing plate 2, and the plurality of cylindrical vortex generators 4 are evenly spaced, and the plurality of cylindrical vortex generators 4 correspond one to one to the plurality of holes 1; as shown Figure 8 As shown, the driving mechanism 5 is connected between the cylindrical vortex generator mounting plate 3 and the bearing plate 2, and is used to drive the cylindrical vortex generator mounting plate 3 to move, so that the cylindrical vortex generator 4 moves in the hole 1 at the corresponding position; the guide mechanism 6 is arranged on the bearing plate 2, and the cylindrical vortex generator mounting plate 3 is slidably matched on the guide mechanism 6 to limit the sliding direction of the cylindrical vortex generator mounting plate 3. Prevent the occurrence of movement position error.

[0036] In such Figure 2 In the illustrated embodiment, the guide mechanism 6 includes: two guide rods 61 and two roller assemblies 62, each guide rod 61 is vertically arranged on the supporting plate 2, and grooves are provided on opposite sides of the two guide rods 61, and the grooves are provided along the length direction of the guide rods 61; the two roller assemblies 62 are respectively provided at the two ends of the cylindrical vortex generator mounting plate 3, each roller assembly 62 includes a bracket and a roller configured on the bracket, the bracket is connected to the cylindrical vortex generator mounting plate 3, the roller cooperates with the groove, and through the movement of the cylindrical vortex generator mounting plate 3, the roller moves linearly in the groove, thereby making the movement of the cylindrical vortex generator mounting plate 3 smoother.

[0037] In some embodiments, the driving mechanism 5 uses a hydraulic driving system, the hydraulic cylinder base of the hydraulic driving system is connected to the bearing plate 2, and the hydraulic rod of the hydraulic cylinder is connected to the cylindrical vortex generator mounting plate 3. The hydraulic drive has fast response speed, timely response, and can also perform stepless movement. The hydraulic components can achieve long-distance connection and can be arranged at different positions of the bearing plate.

[0038] like Fig.10As shown, the vortex generator plate moves with the movement of the hydraulic rod, and the maximum stroke of the hydraulic rod in the hydraulic cylinder is 1% of the chord length. The maximum stroke of the hydraulic rod is the maximum height of the cylindrical vortex generator 4 extending out of the airfoil surface.

[0039] In some embodiments, it also includes: a control system and a wind direction sensor, the control system is connected to the drive mechanism 5, and is used to control the movement of the drive mechanism 5 when the wind turbine airfoil is at different angles of attack; the wind direction sensor is installed at the top of the tower, which receives the wind direction signal more quickly and accurately, and is used to collect the direction of the incoming flow and transmit the wind direction signal to the control system. When there is no wind, the wind direction sensor has no signal detection and transmission, then the control system cannot control the drive mechanism 5 to start, the hydraulic cylinder does not extend, that is, the vertical axis wind turbine does not work, the cylindrical vortex generator 4 on the vertical axis wind turbine blade does not extend, and the end face of the cylindrical vortex generator 4 forms a smooth curved surface with the surface of the blade; when there is wind, the vertical axis wind turbine can rotate the wind turbine blade due to the special geometric shape of the blade.

[0040] In some embodiments, in order to reduce the overall mass of the blade, the cylindrical vortex generator mounting plate 3 and the cylindrical vortex generator 4 are made of aluminum alloy material, and the cylindrical vortex generator 4 is a hollow cylinder.

[0041] like Figure 8 As shown, when the cylindrical vortex generator 4 is not extended out of the hole, the end surface of the cylindrical vortex generator 4 and the airfoil surface form a smooth curve.

[0042] Specific as Figure 4 , Figure 5 and Fig.10 As shown, a spatial rectangular coordinate system is established with the chord formed by the line connecting the leading edge and the trailing edge of the airfoil blade as the X-axis, the perpendicular direction of the two parallel surfaces of the airfoil blade as the Y-axis, and the plane direction perpendicular to the X and Y axes as the Z-axis. The cylindrical vortex generator mounting plate 3 is perpendicular to the two parallel surfaces of the airfoil blade, and the width of the cylindrical vortex generator 4 is perpendicular to the surface formed by the Y-axis and the Z-axis. The length of the cylindrical vortex generator mounting plate 3 is 80%b, where b is the vertical distance between the two parallel sides of the airfoil blade. In order to facilitate the installation of the guide rod, a space of 10%b is reserved between the two end surfaces of the cylindrical vortex generator mounting plate 3 and the two parallel sides of the airfoil blade. The width of the cylindrical vortex generator mounting plate 3 is greater than the diameter of the cylindrical vortex generator 4; for example, the width of the cylindrical vortex generator mounting plate 3 is 6% of the chord length, and the chord length refers to the length of the line connecting the leading edge and the trailing edge, as shown in FIG. Fig.10As shown in the figure, the interval between two adjacent cylindrical vortex generators 4 is 2%-3% of the chord length, and the diameter of the cylindrical vortex generator 4 is 2% of the chord length, so as to achieve a relatively high efficiency in suppressing airflow separation. The length of the cylindrical vortex generator 4 is such that when it is not in operation, the end surface just forms a smooth curved surface with the airfoil surface.

[0043] like Figure 4 As shown, the position of the hole 1 is 15%-20% away from the leading edge in the X-axis direction with the leading edge of the blade as the starting point, the center of the vortex generator 4 located at the edge of the vortex generator plate 3 is 5%b away from the end surface of the plate, and multiple holes 1 are in a straight line along the Y-axis direction, and the axes of the holes 1 on the upper surface of the blade are coaxial with the axes of the holes 1 on the lower surface of the blade.

[0044] In some embodiments, the width and height of the supporting plate 2 are the same as those of the cylindrical vortex generator mounting plate 3, the length of the supporting plate 2 is the vertical distance b between the two parallel sides of the blade, and the height position of the supporting plate 2 in the blade is the midpoint of the line connecting the centers of the upper and lower holes of the airfoil.

[0045] The blades of the large vertical axis wind turbine with bidirectional automatic retractable cylindrical vortex generators in this embodiment can change the flow state of the fluid by generating vortices in the fluid, thereby achieving the purpose of enhancing mixing, delaying separation, etc. And the entire control system is composed of a controller and a wind direction sensor. The wind direction sensor installed at the top of the tower receives the incoming flow, converts it into an electrical signal and transmits it to the controller installed on the tower for processing. When the control system detects that the azimuth angle of the blade is the stall angle of attack, the controller will control the drive of the hydraulic system of the drive device, and the hydraulic system will drive the vortex generator to extend, and adjust the length of the cylindrical vortex generator to extend according to the size of the angle of attack.

[0046] At small angles of attack, the fluid separation tendency is small, and only a shorter vortex generator extension length is required to effectively control the boundary layer. Because the stability of the boundary layer is relatively high at this time, the vortices generated by the shorter generator are sufficient to enhance the momentum exchange in the boundary layer and maintain a good fluid attachment state.

[0047] As the angle of attack increases, the tendency of fluid separation increases. In order to delay fluid separation more effectively, the length of the cylindrical vortex generator is increased to generate a stronger and more effective vortex. The longer cylindrical vortex generator can better introduce the high-energy fluid in the outer layer into the boundary layer, counteracting the adverse pressure gradient and flow separation tendency caused by the increase in the angle of attack, thereby improving the fluid dynamics performance of the object.

[0048] Specifically, when there is no wind, the wind direction sensor has no signal detection and transmission, and the control system cannot control the drive mechanism 5 to start, and the hydraulic cylinder does not extend or retract, that is, the vertical axis wind turbine does not work, so the cylindrical vortex generators 4 on the vertical axis wind turbine blades do not extend, and the end faces of the cylindrical vortex generators 4 form a smooth curved surface with the surface of the blades.

[0049] When there is wind, the vertical axis wind turbine blades can rotate due to the special geometric shape of the blades. Fig. 9 As shown, when the incoming flow comes from one direction, the entire wind turbine is divided into an upwind area and a downwind area. The side close to the incoming flow direction is the upwind area, and the other side is the downwind area.

[0050] Generally, a wind turbine has multiple blades. Fig. 9 As an example, when the wind turbine is at 0°, the angle of attack of the blade is 0°, and there is no airflow separation. Therefore, the cylindrical vortex generators 4 of the two cylindrical vortex generator assemblies in the blade do not extend. As the blade gradually rotates, the angle of attack gradually increases, and the airflow and wind force on the blade also increases. Fig. 9 As shown, in order to suppress airflow separation, the cylindrical vortex generator on the inner side of the entire vertical axis wind turbine gradually extends out, and in order to reduce resistance, the corresponding outer cylindrical vortex generator 4 remains stationary, and the outer cylindrical vortex generator 4 forms a smooth curved surface with the blade surface.

[0051] like Fig. 9 As shown in the figure, it is to express the variation law of the extension amount of the cylindrical vortex generator 4 with the azimuth angle. Assuming that the flow comes from one side and a single blade rotates, as the angle of attack gradually increases, the cylindrical vortex generator 4 extends longer. Fig. 9 In the process, the blades rotate from 0°, the angle of attack is 0, the vortex generator does not extend, and the blades turn to Fig. 9 The maximum angle of attack is 90°, and the vortex generator is at its longest extension. As the rotation continues, the angle of attack gradually decreases until the vortex generator gradually drops to Fig. 9 At the 180° position, the vortex generator on the inner side of the 180° position forms a smooth curved surface with the blade surface. When the blade continues to rotate at 180°, the blade faces away from the incoming flow, and the cylindrical vortex generator 4 on the outer side of the entire vertical axis wind turbine gradually extends out. Fig. 9 As shown, in order to reduce the drag, the corresponding inner cylindrical vortex generator 4 remains stationary. As the angle of attack increases, the cylindrical vortex generator 4 extends longer, and the blade turns to Fig. 9 The maximum angle of attack is at the 270° position, and the cylindrical vortex generator 4 is at its longest extension length. As the rotation continues, the angle of attack gradually decreases, so the cylindrical vortex generator 4 gradually descends until Fig. 9At the middle 360° (0°) position, the cylindrical vortex generator 4 outside the 360° (0°) position descends to form a smooth curved surface with the blade surface. The above is the expansion and contraction process of the cylindrical vortex generator 4 when one blade of the vertical axis wind turbine rotates one circle.

[0052] A large vertical axis wind turbine with a bidirectional automatic telescopic cylindrical vortex generator in this embodiment can adjust the extended length of the cylindrical vortex generator according to the size of the angle of attack, thereby generating vortices adapted thereto, optimizing the aerodynamic performance of the blades at different angles of attack, thereby improving the comprehensive performance of the blades during the entire operation process. For example, in an actual wind power generation environment, gusts are a common phenomenon. Gusts can cause sudden changes in wind speed and direction, which have a great impact on the aerodynamic performance of wind turbine blades. The bidirectional automatic telescopic cylindrical vortex generator can respond quickly to such changes. When a gust hits, it can adjust the extended length in time, change the vortex structure on the blade surface, and reduce the adverse effects of gusts on the blades, such as reducing blade vibrations and sudden changes in aerodynamic loads caused by gusts, thereby improving the stability and reliability of the wind turbine.

[0053] It is worth noting that airflow separation refers to the phenomenon that the airflow near the surface of the wind turbine blade no longer flows closely to the blade surface, but detaches from the blade surface. Under normal circumstances, when the airflow flows through the blade, due to the effect of viscosity, the airflow will form a boundary layer on the blade surface. The airflow velocity in the boundary layer gradually changes from zero at the blade surface to the same as the external mainstream velocity.

[0054] Dynamic stall refers to the occurrence of stall under unsteady flow conditions, when the aerodynamic characteristics of the airfoil (for structures such as wind turbine blades) or wing change dramatically, the lift coefficient drops sharply, and the drag coefficient increases sharply. Different from the traditional static stall, dynamic stall is mainly caused by the dynamic characteristics of the flow, such as the rapid pitching motion of the airfoil, the rotational motion or the rapid change of the incoming flow velocity.

[0055] The stall angle of attack refers to a critical angle that the airfoil blade reaches in the airflow. When the angle of attack (increases to the stall angle of attack, the airflow on the upper surface of the wing will be severely separated, causing the lift coefficient generated by the wing to begin to drop sharply and the drag coefficient to increase sharply.

[0056] The above disclosures are only several preferred specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A large vertical axis wind turbine with a bidirectional automatic telescopic cylindrical vortex generator, characterized in that: A row of holes (1) is provided on the upper and lower surfaces of a blade of a vertical wind turbine, a bearing plate (2) is provided inside the blade, two ends of the bearing plate (2) are respectively connected to two parallel side surfaces of the blade, and cylindrical vortex generator assemblies are provided on both plate surfaces of the bearing plate (2), the two cylindrical vortex generator assemblies are symmetrically arranged, one of the cylindrical vortex generator assemblies is close to the upper surface of the blade, and the other cylindrical vortex generator assembly is close to the lower surface of the blade, and each cylindrical vortex generator assembly comprises: A cylindrical vortex generator mounting plate (3) parallel to the bearing plate (2); A plurality of cylindrical vortex generators (4) are arranged on a surface of the cylindrical vortex generator mounting plate (3) away from the bearing plate (2), and the plurality of cylindrical vortex generators (4) are arranged at even intervals, and the plurality of cylindrical vortex generators (4) correspond one-to-one to the plurality of holes (1); A driving mechanism (5) connected between the cylindrical vortex generator mounting plate (3) and the bearing plate (2), and used for driving the cylindrical vortex generator mounting plate (3) to move so that the cylindrical vortex generator (4) moves in the hole (1) at a corresponding position; The guide mechanism (6) is arranged on the bearing plate (2), and the cylindrical vortex generator mounting plate (3) is slidably fitted on the guide mechanism (6) to limit the sliding direction of the cylindrical vortex generator mounting plate (3).

2. A large vertical axis wind turbine with bidirectional automatic telescopic cylindrical vortex generator according to claim 1, characterized in that: The guiding mechanism (6) comprises: Two guide rods (61), each guide rod (61) is vertically arranged on the bearing plate (2), and grooves are provided on opposite sides of the two guide rods (61), and the grooves are provided along the length direction of the guide rods (61); Two roller assemblies (62) are respectively arranged at two ends of the cylindrical vortex generator mounting plate (3), and each roller assembly (62) includes a bracket and a roller arranged on the bracket. The bracket is connected to the cylindrical vortex generator mounting plate (3), and the roller cooperates with the groove. Through the movement of the cylindrical vortex generator mounting plate (3), the roller moves linearly in the groove.

3. A large vertical axis wind turbine with bidirectional automatic telescopic cylindrical vortex generator according to claim 1, characterized in that: The driving mechanism (5) is a hydraulic driving system, the hydraulic cylinder base of the hydraulic driving system is connected to the bearing plate (2), and the hydraulic rod of the hydraulic cylinder is connected to the cylindrical vortex generator mounting plate (3).

4. A large vertical axis wind turbine with bidirectional automatic telescopic cylindrical vortex generator according to claim 3, characterized in that: The maximum stroke of the hydraulic rod in the hydraulic cylinder is the maximum height of the cylindrical vortex generator (4) extending out of the airfoil surface.

5. A large vertical axis wind turbine with bidirectional automatic telescopic cylindrical vortex generator according to claim 1, characterized in that: Also includes: A control system and a wind direction sensor, wherein the wind direction sensor is installed at the top of the tower and is used to collect the direction of the incoming flow and transmit the wind direction signal to the control system. The control system is connected to the drive mechanism (5) and is used to control the movement of the drive mechanism (5) when the wind turbine airfoil is at different angles of attack.

6. A large vertical axis wind turbine with bidirectional automatic telescopic cylindrical vortex generator according to claim 1, characterized in that: The cylindrical vortex generator mounting plate (3) and the cylindrical vortex generator (4) are made of aluminum alloy material, and the cylindrical vortex generator (4) is a hollow cylinder.

7. A large vertical axis wind turbine with bidirectional automatic telescopic cylindrical vortex generator according to claim 1, characterized in that: When the cylindrical vortex generator (4) is in a state of not protruding from the hole, the end surface of the cylindrical vortex generator (4) and the airfoil surface form a smooth curve.

8. A large vertical axis wind turbine with bidirectional automatic telescopic cylindrical vortex generator according to claim 1, characterized in that: The width of the cylindrical vortex generator mounting plate (3) is greater than the diameter of the cylindrical vortex generator (4); the interval between two adjacent cylindrical vortex generators (4) is 2%-3% of the chord length, and the length of the cylindrical vortex generator (4) is such that when it is not in operation, the end surface of the cylindrical vortex generator just forms a smooth curved surface with the airfoil surface.

9. A large vertical axis wind turbine with bidirectional automatic telescopic cylindrical vortex generator according to claim 8, characterized in that: The plurality of holes (1) form a straight line along the Y-axis direction, and the axes of the holes (1) on the upper surface of the blade and the holes (1) on the lower surface of the blade are coaxial.

10. A large vertical axis wind turbine with bidirectional automatic telescopic cylindrical vortex generator according to claim 8, characterized in that: The width and height of the bearing plate (2) and the cylindrical vortex generator mounting plate (3) are the same, the length of the bearing plate (2) is the vertical distance b between two parallel sides of the blade, and the height position of the bearing plate (2) inside the blade is the midpoint of the line connecting the centers of the upper and lower holes of the airfoil.

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