Freely-controllable trailing edge flap structure of wind turbine
By using a multi-parameter controlled trailing edge flap structure, the free movement of the wind turbine's trailing edge flaps is achieved through a sliding rail and eccentric wheel system. This solves the efficiency and stability problems of wind turbines under single-parameter control and improves the performance of wind turbines in complex wind conditions.
Patent Information
- Application Number
- CN202520854080.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-30
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-04-30
AI Technical Summary
The variation range of existing variable trailing edge flap structures is related to a single parameter, which makes it impossible to achieve complex control laws for complex airflow conditions, resulting in limited efficiency and stability of wind turbines under different wind conditions.
Design a multi-parameter controlled trailing edge flap structure. Through a system consisting of a flexible trailing edge, longitudinal slide rail, transverse slide rail, support rod, motion rod and motor, the trailing edge flap can move freely using a servo motor and eccentric wheel, and multi-parameter control can be performed according to wind speed conditions.
It achieves multi-degree-of-freedom variation of the trailing edge flaps, improves the aerodynamic characteristics and power generation efficiency of the wind turbine at different wind speeds, and reduces the complexity of the mechanical structure and maintenance costs.
Smart Images
Figure CN223952716U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the field of wind driven generators, and particularly relates to a tail edge flap structure of a wind turbine which can be freely controlled. BACKGROUND
[0002] The technical background of the variable tail edge flap of the wind turbine originates from the continuous upgrading of the demand for the optimization of the aerodynamic performance of the traditional wind turbine blade. In the field of wind power generation, the blade design needs to take into account the power capture efficiency at high wind speed and the starting performance at low wind speed, and at the same time needs to cope with complex wind conditions such as turbulence and wind shear. The traditional fixed blade relies on stall regulation or variable pitch control, but there is an efficiency bottleneck: stall control will cause energy loss at high wind speed, and the variable pitch system has a delayed response and a complex mechanical structure. Therefore, by drawing on the flap technology in the aviation field, the concept of variable tail edge flap is introduced into the design of the wind turbine.
[0003] The core principle is to dynamically change the airfoil camber and effective chord length by actively adjusting the deflection angle of the tail edge flap of the blade, so as to real-time regulate the lift coefficient and the drag coefficient. Below the rated wind speed, the flap is deployed to increase the blade area and delay stall, thereby improving the energy capture at low wind speed; above the rated wind speed, the flap is retracted to reduce the drag and control the load fluctuation, thereby avoiding power overload. Compared with the variable pitch system, the variable tail edge flap has the advantages of fast response speed, lightweight structure, uniform load distribution, etc., and is particularly suitable for the next generation of wind turbines with large-scale and flexible design.
[0004] The development of this technology benefits from the progress of material science, intelligent sensing and advanced control algorithms. Experiments show that the variable tail edge flap can increase the annual power generation of the wind turbine by 5%-15%, while reducing the fatigue load and noise level. Although it faces challenges such as control complexity and maintenance cost, its potential to improve the efficiency of wind energy utilization and the adaptability of the power grid makes it an important direction for the intelligent design of wind turbines.
[0005] However, at present, the variable tail edge flap structure has a relatively single change. For example, the telescopic variable tail edge flap changes the tail edge flap through the telescoping of the device, so the change range of the tail edge flap is related to the telescoping length of the device; the swing type variable tail edge flap controls the change of the tail edge flap through the angle of rotation of the device, so the change range of the tail edge flap is related to the angle of rotation of the device. Regardless of the form, the change range of the tail edge flap is related to a single parameter, and the corresponding control law is also relatively single, for example, the current variable tail edge flap change law is to tilt up by 10° and then tilt down by 10°. This single change can only be used for the case where the inflow weather conditions of the wind turbine are relatively uniform, and cannot realize complex control law of the tail edge flap for complex airflow conditions, so it is necessary to design a variable tail edge flap structure which can freely move through multi-parameter control. UTILITY MODEL CONTENTS
[0006] In view of the problems existing in the current variable trailing edge flap, the utility model discloses a trailing edge flap structure of free control, can realize the complex control of wind turbine trailing edge flap.
[0007] The wind turbine trailing edge flap structure of free control can be controlled by multiple parameters and freely moves, the structure can change the trailing edge shape according to the situation, thereby improving the aerodynamic characteristics of the wind turbine and increasing the power generation of the wind turbine.
[0008] The wind turbine trailing edge flap structure of free control is connected with the wind turbine blade wing segment through rivets, and the trailing edge flap structure comprises a flexible trailing edge, and the flexible trailing edge is provided with a horizontal slide rail, a vertical slide rail, a supporting rod, a moving rod, an eccentric wheel and a motor.
[0009] The vertical slide rail has two, and is respectively arranged between the upper surface and the lower surface of the blade wing segment, and the horizontal slide rail has two, and is respectively arranged on the two vertical slide rails, and when the vertical slide rail moves, the horizontal slide rail can be driven to move up and down.
[0010] The moving rod has two, one end of the moving rod is connected with the tail of the flexible trailing edge, and the other end is connected with the eccentric wheel on the motor, and the moving rod is provided with a sliding groove, and the supporting rod passes through the sliding groove.
[0011] The vertical slide rail and the horizontal slide rail are respectively connected with the motor.
[0012] Further, the vertical slide rail comprises a base one, a guide rail one and a sliding block one, the base one is fixedly installed between the upper surface and the lower surface of the blade wing segment, the base one is provided with the guide rail one, the sliding block one is installed on the guide rail one and slides along the guide rail one.
[0013] Further, the horizontal slide rail comprises a base two, a guide rail two and a sliding block two, the base two is provided with the guide rail two, the sliding block two is installed on the guide rail two and slides along the guide rail two, and the base two is installed on the sliding block one of the vertical slide rail and can be connected by bolts or fixed by welding, and when the sliding block one moves, the horizontal slide rail is driven to move.
[0014] Further, the end of the supporting rod can be connected with the sliding block two of the horizontal slide rail by bolts.
[0015] Further, the motion rod and the eccentric wheel can be bolted. The sliding slot in the middle of the motion rod is penetrated, so that the support rod can move in the motion rod, and the sliding slot has the same width as the outer diameter of the support rod. When the positions of the sliding blocks in the longitudinal slide rail and the transverse slide rail are fixed, the position of the support rod is also fixed, and the motion rod can swing with the support rod as the fulcrum. When the position of the support rod is determined, the relative position of the motion rod and the support rod is adjusted, and then the self-locking structure of the motion rod is used to ensure that the relative position does not change. The self-locking structure of the motion rod in the utility model comprises a clamping air cylinder, a guide rail clamp or a locking block.
[0016] The longitudinal slide rail and the transverse slide rail are respectively connected with motors, adopt screw rod transmission, are connected together through a shaft coupling, and then the rotation of the servo motor is converted into linear motion, so that the positions of the sliding blocks in the longitudinal slide rail and the transverse slide rail can be controlled through the motor, and then the position of the support rod can be controlled. The eccentric wheel is directly driven by the motor, the motor rotates, the eccentric wheel converts the rotation into eccentric rotation, and the motion rod swings.
[0017] During the motion process, firstly, the position of the transverse slide rail is determined by adjusting the sliding block one of the longitudinal slide rail through the motor, then the position of the support rod is determined by adjusting the sliding block two of the transverse slide rail, the motion rod swings up and down with the support rod as the fulcrum, the flexible trailing edge is driven to move up and down, and the eccentric wheel is driven to rotate by the motor.
[0018] In actual process, the positions of the longitudinal slide rail and the transverse slide rail can be set according to actual inflow wind speed conditions, the position of the support rod is determined, then the motion law of the motor is set, the rotating speed of the eccentric wheel is controlled, and the up and down motion of the motion rod is driven. Different support points can realize different motion amplitudes of the motion rod, the eccentric wheel and the slide rail are jointly adjusted, and the free control of the trailing edge flap can be realized.
[0019] The utility model discloses the beneficial effects of the following:
[0020] (1) the utility model discloses a trailing edge flap is driven by the motion rod, because the motion rod support point can change, therefore the motion law of the motion rod can change, thereby realize the multi-degree-of-freedom change of trailing edge flap.
[0021] (2) in the utility model, the motion rod is controlled by the motor driven eccentric wheel, and the support rod can be controlled by the slide rail, the swing amplitude, swing length and swing frequency of the trailing edge flap are changed, and the multi-parameter control of the trailing edge flap is realized.
[0022] (3) the structure is composed of a plurality of rods, has good stability and certain structural strength.
[0023] (4) The utility model has the advantages of simple structure, flexible operation, convenient installation, easy maintenance and obvious effect, and can effectively improve the aerodynamic characteristics of the wind turbine blade. BRIEF DESCRIPTION OF DRAWINGS
[0024] Figure 1 It is an installation schematic view of the trailing edge flap structure of the utility model;
[0025] Figure 2 It is an internal structure schematic view of the trailing edge flap structure of the utility model;
[0026] Figure 3 It is a schematic view of the longitudinal slide rail of the utility model;
[0027] Figure 4 It is a schematic view of the transverse slide rail of the utility model;
[0028] Figure 5 It is a structure schematic view of the motion rod of the utility model;
[0029] Figure 6 It is the motion form of the trailing edge flap structure under the condition of wind speed 5m / s;
[0030] Figure 7 It is the motion form of the trailing edge flap structure under the condition of wind speed 15m / s.
[0031] In the drawing: 1-wind turbine blade wing section, 2-flexible trailing edge;
[0032] Transverse slide rail, 22-longitudinal slide rail, 23-supporting rod, 24-motion rod, 25- eccentric wheel;
[0033] 221-base one, 222-guide rail one, 223-slide block one;
[0034] 211-base two, 212-guide rail two, 213-slide block two;
[0035] 241-sliding groove. DETAILED DESCRIPTION
[0036] The utility model will be described in detail in combination with the drawings and examples. Example 1
[0037] A wind turbine freely controllable trailing edge flap structure is connected with a wind turbine blade wing section 1 through a rivet; as Figures 1-2As shown, the trailing edge flap structure includes a flexible trailing edge 2, on which are mounted a transverse slide rail 21, a longitudinal slide rail 22, a support rod 23, a moving rod 24, an eccentric wheel 25, and a motor. There are two longitudinal slide rails 22, respectively installed between the upper and lower surfaces of the blade section. There are two transverse slide rails 21, respectively installed on the two longitudinal slide rails. When the longitudinal slide rails move, they can drive the transverse slide rails to move up and down. A support rod 23 is installed between the two transverse slide rails, and the support rod can move along the transverse slide rails. There are two moving rods 24, one end of which is connected to the tail of the flexible trailing edge, and the other end is connected to the eccentric wheel 25 on the motor. The moving rod has a groove 241, through which the support rod passes. Figure 5 As shown; the longitudinal slide rail and the transverse slide rail are respectively connected to the motor.
[0038] like Figure 3 As shown, the longitudinal slide rail 22 includes a base 221, a guide rail 222, and a slider 223; the base is fixedly installed between the upper and lower surfaces of the blade section, the guide rail is provided on the base, and the slider is installed on the guide rail and slides along the guide rail.
[0039] like Figure 4 As shown, the transverse slide rail 21 includes a base 211, a guide rail 212, and a slider 213. The base 2 has the guide rail 2, and the slider 2 is mounted on the guide rail 2 and slides along the guide rail 2. The base 2 is mounted on the slider 2 of the longitudinal slide rail, and can be connected by bolts or welded. When the slider 213 moves, it drives the transverse slide rail to move. The end of the support rod can be connected to the slider 213 of the transverse slide rail with bolts.
[0040] The moving rod and the eccentric wheel can be connected by bolts. For example... Figure 5 As shown, the groove in the middle of the moving rod is through-hole, allowing the support rod to move within it. The width of the groove is the same as the outer diameter of the support rod. Once the positions of the sliders in the longitudinal and transverse slide rails are fixed, the position of the support rod is also fixed, allowing the moving rod to swing around the support rod as a fulcrum. After the position of the support rod is determined, the relative positions of the moving rod and the support rod are adjusted, and then the self-locking structure of the moving rod ensures that the relative positions do not change. The self-locking structure of the moving rod in this invention includes a clamping cylinder, a guide rail clamp, or a locking block (not shown in the figure).
[0041] Application of the trailing edge flap structure of this utility model:
[0042] (1) Based on the shape of the wind turbine blade section and the incoming meteorological conditions, the optimal motion length, motion amplitude and motion frequency of the trailing edge flap under different incoming wind speeds can be determined by numerical simulation method. This part can be calculated by existing technology.
[0043] (2) Considering the best structure of the trailing edge flap of the blade segment, the fixed position of the longitudinal slide rail can be determined first, and the longitudinal slide rail is fixed between the upper and lower surfaces of the blade segment;
[0044] (3) The transverse slide rail is installed on the longitudinal slide rail, and when the longitudinal slide rail moves, the transverse slide rail can move up and down;
[0045] (4) A support rod is installed between the two transverse slide rails, and the support rod can move horizontally in the transverse slide rail;
[0046] (5) The movement rod is connected with the support rod through a sliding groove, one end of the movement rod is connected with the flexible trailing edge, and the other end is connected with the eccentric wheel on the motor;
[0047] (6) During operation, the position of the support rod is adjusted through the longitudinal slide rail and the transverse slide rail according to the incoming flow speed, and the movement of the eccentric wheel can drive the movement rod to swing, and the position of the support rod is different under different conditions, so as to realize the free control of the trailing edge flap.
[0048] When the flexible trailing edge does not move, the rear trailing edge structure and the front blade segment main body maintain the original shape. When the flexible trailing edge changes, there are two control modes. One is to first drive the longitudinal slide rail to move by using the motor, and then drive the transverse slide rail to move to the appropriate position, and then drive the transverse slide rail by using the motor, so that the support rod connected with the transverse slide rail moves to the predetermined position and remains fixed. Then, the eccentric wheel is driven by the motor, the eccentric wheel is connected with the movement rod, and the movement rod starts to move up and down as a lever with the support rod as the fulcrum, thereby driving the flexible trailing edge to deform upward or downward. By controlling the position of the support rod through the longitudinal slide rail and the transverse slide rail, the position of the fulcrum of the movement rod can be changed, the lever movement of the movement rod can be changed, and the deformation amplitude of the flexible trailing edge can be changed. The movement law of the movement rod is driven by the eccentric wheel, and the eccentric wheel is driven by the motor. When the movement law of the motor changes, the movement law of the eccentric wheel and the movement rod will also change, and the swing amplitude of the movement rod will be different.
[0049] The other control mode is to simultaneously drive the longitudinal slide rail, the transverse slide rail and the eccentric wheel by the motor. The movement of the longitudinal slide rail and the transverse slide rail will affect the position of the support rod, the change of the position of the support rod will affect the swing amplitude of the movement rod, and the change of the movement law of the eccentric wheel will affect the swing frequency of the movement rod. Simultaneously driving the longitudinal slide rail, the transverse slide rail and the eccentric wheel can make the movement rod move freely, and the control law is not limited to single parameter control. The swing amplitude, swing length and swing frequency of the trailing edge flap can be changed, and more changes of the flexible trailing edge can be realized. No matter which control mode is used, the control law can be reasonably adjusted according to the shape of the wind turbine blade, the incoming flow weather conditions and the like. Example 2
[0050] In order to better describe the technical scheme of the utility model, the following will be combined with the actual application to explain the implementation process.
[0051] (1) Taking the wind turbine S809 airfoil as an example, the aerodynamic characteristics of the airfoil are calculated by the existing numerical simulation method, and the following can be determined:
[0052] When the incoming flow wind speed is 5m / s, the length of the trailing edge flap is 0.15c, and the swing range is ±15°, which is the best flap structure (c is the chord length of the airfoil).
[0053] When the incoming flow wind speed is 10m / s, the length of the trailing edge flap is 0.1c, and the swing range is ±15°, which is the best flap structure.
[0054] When the incoming flow wind speed is 15m / s, the length of the trailing edge flap is 0.05c, and the swing range is ±10°, which is the best flap structure.
[0055] (2) According to the best flap structure under the above three wind speeds, the longitudinal slide rail position can be determined as 0.1c away from the trailing edge point, and the longitudinal slide rail is fixed between the upper and lower wing segments.
[0056] (3) The transverse slide rail can be designed to have a length of 0.1c, and the base of the transverse slide rail is installed on the longitudinal slide rail. When the longitudinal slide rail moves, the transverse slide rail can move longitudinally.
[0057] (4) A support rod is installed between the two transverse slide rails, and the transverse slide rails move simultaneously to move the support rod. It can be seen that when the longitudinal slide rail and the transverse slide rail move, the support rod can be in different positions in space.
[0058] (5) The moving rod is connected to the support rod through a sliding groove, and the relative position of the support rod and the moving rod can be adjusted. One end of the moving rod is connected to the trailing edge, and the other end is connected to the eccentric wheel on the motor. When the motor starts, the eccentric wheel starts to move, and one end of the moving rod also starts to rotate with the eccentric wheel. The moving rod starts to swing with the support rod as the fulcrum, thereby driving the trailing edge flap to move.
[0059] (6) As an example, when the wind speed is 5m / s, the length of the trailing edge flap is 0.15c, and the swing range is ±15°. Then the longitudinal slide rail can be adjusted to the middle position, the transverse slide rail moves to make the support rod move to a position 0.15c away from the trailing edge, the eccentric wheel drives the moving rod to swing ±15° with the support rod as the fulcrum, as shown in Figure 6 .
[0060] When the incoming flow wind speed is 15 m / s, the length of the trailing edge flap is 0.05c, the swing range is ±10°, the longitudinal slide rail position is unchanged, the transverse slide rail adjusts the position of the movement track of the support rod at a distance of 0.05c from the trailing edge, the eccentric wheel drives the movement rod to swing around the support rod as a fulcrum, and the swing range is ±10°, as shown in Figure 7
[0061] It can be seen that when the support rod is in different positions, the length and range of the swing of the trailing edge flap part can be different, so that the trailing edge flap can obtain the best effect according to different conditions.
[0062] It should be noted that first, the swing range selected in the embodiment is symmetrical, so the longitudinal slide rail does not need to move, but when the wing type swing range is asymmetrical, for example, from -12° to 3°, the longitudinal slide rail also needs to move. The main function of the longitudinal slide rail is to adjust the swing range of the movement rod, and the main function of the transverse slide rail is to adjust the swing length of the movement rod.
[0063] Second, for a wind turbine, the incoming flow wind speed will not change much in a short time, even if it encounters a particularly fast wind speed change, the wind speed measured by the wind turbine will not be immediately adjusted, so the structure of the utility model is also related to the wind speed, but because the wind speed of the wind turbine does not change very fast, it is usually measured in hours, so the structure of the utility model has sufficient time to adjust.
[0064] Third, the frequency of the movement rod can be controlled by the eccentric wheel, the rotation speed of the eccentric wheel determines the swing frequency of the movement rod, and the eccentric wheel can be driven by a motor.
Claims
1. A freely controllable trailing edge flap structure for a wind turbine, connected to a wind turbine blade segment by rivets; characterized in that: The trailing edge flap structure comprises a flexible trailing edge, transverse sliding rails, longitudinal sliding rails, support rods, movement rods, eccentric wheels and motors mounted on the flexible trailing edge; The longitudinal sliding rails are two, respectively mounted between the upper and lower surfaces of the blade wing section; the transverse sliding rails are two, respectively mounted on the two longitudinal sliding rails, and the longitudinal sliding rails drive the transverse sliding rails to move up and down; a support rod is mounted between the two transverse sliding rails, and the support rod moves along the transverse sliding rails; The movement rods are two, one end of the movement rod is connected with the tail of the flexible trailing edge, and the other end is connected with the eccentric wheel on the motor; the movement rod is provided with a sliding groove, and the support rod passes through the sliding groove; The longitudinal sliding rails and the transverse sliding rails are respectively connected with motors.
2. A freely controllable trailing edge flap configuration for a wind turbine according to claim 1, characterized in that: The longitudinal sliding rails comprise a base one, a guide rail one and a sliding block one; the base one is fixedly installed between the upper and lower surfaces of the blade wing section, and the base one is provided with the guide rail one; the sliding block one is installed on the guide rail one and slides along the guide rail one.
3. A freely controllable trailing edge flap configuration for wind turbines according to claim 1, characterized in that: The transverse sliding rails comprise a base two, a guide rail two and a sliding block two; the base two is provided with the guide rail two; the sliding block two is installed on the guide rail two and slides along the guide rail two; the base two is installed on the sliding block one in the longitudinal sliding rail.
4. A freely controllable trailing edge flap configuration for wind turbines according to claim 1, characterized in that: The end of the support rod is connected with the sliding block two in the transverse sliding rail through bolts.
5. A freely controllable trailing edge flap arrangement for a wind turbine according to claim 1, characterized in that: The width of the sliding groove of the movement rod is the same as the outer diameter of the support rod.
6. A freely controllable trailing edge flap configuration for wind turbines according to claim 1, characterized in that: The movement rod is provided with a clamping air cylinder, a guide rail clamp or a locking block.