CN110792554A - Deformation type wind driven generator blade - Google Patents

Abstract

The modified wind turbine blade is composed of a blade skeleton (1), a connecting beam (2), a miniature electric push rod (3), a movable beam (4), an inner layer of the blade (5), and an outer elastic skin of the blade (6) and the independent trailing edge (7), the section of the blade frame (1) is radially fixed by the connecting beam (2), the section of the blade frame (1) is provided with a guide groove (8), the guide groove (8), and the blade Miniature electric push rods (3) are respectively fixed at the trailing edge of the skeleton (1), both ends of the movable beam (4) of the blade extend into the guide groove (8), and an inner blade layer (5) is arranged outside the blade skeleton (1), The trailing edge of the blade skeleton (1) is provided with an independent trailing edge (7), and an outer blade outer elastic skin (6) is provided outside the inner blade layer (5). The invention has the beneficial effects that deformation is carried out according to different wind speeds, the aerodynamic performance of the blades is adjusted, the power output of the wind turbine is controlled, and the pitch control system of the traditional wind turbine can be replaced.

Description

Modified wind turbine blades

technical field

The invention relates to a variable-form wind power generator blade, and belongs to the technical field of wind power generators.

Background technique

Because wind turbines operate under conditions of varying wind speeds such as gusts, wind turbines need to have an adjustment function during operation to control the wind energy they capture. On the one hand, it ensures maximum energy acquisition, and at the same time reduces the impact of wind on wind turbines. In order to realize the above functions, the wind turbine adopts the pitch control technology. The technology is mainly based on adjusting the pitch angle of the blades, thereby changing the angle of attack of the airflow on the blades, changing the aerodynamic performance of the blades, and then controlling the wind energy captured by the wind rotor.

The aerodynamic performance of a wind turbine is mainly determined by the aerodynamic performance of the blade airfoil, and the factors affecting the airfoil performance are mainly due to two reasons: one is the motion state of the incoming flow; the other is the geometry of the airfoil, such as the camber of the airfoil. , thickness, etc. A large number of experimental studies have proved that increasing the camber and thickness of the airfoil can significantly increase the lift-drag ratio of the airfoil and improve its aerodynamic performance. Therefore, when the incoming wind speed is low, increasing the thickness and curvature of the blade can improve the aerodynamic performance of the blade and increase the output power of the wind turbine; when the wind speed is too high, the thickness and curvature of the blade can be reduced, reducing the blade's Aerodynamic performance, reducing the output power of the wind turbine.

Because airfoils can directly affect the aerodynamic performance of wind turbine blades, the aerodynamic performances of airfoils with different thicknesses and cambers are significantly different. Based on the influence of the airfoil thickness and camber on the aerodynamic performance of the airfoil, the invention proposes a method of changing the airfoil thickness and camber of the blade section to achieve the purpose of controlling the power of the wind turbine.

SUMMARY OF THE INVENTION

The main purpose of the invention is to adjust the aerodynamic performance of the blade and control the output power of the wind turbine by changing the shape of the blade. Angle, and then change the aerodynamic shape of the blade, adjust the aerodynamic performance of the wind turbine, and achieve the purpose of controlling the output power of the wind turbine.

The modified wind turbine blade of the present invention is composed of a blade skeleton 1, a connecting beam 2, a miniature electric push rod 3, a movable beam 4, an inner layer of the blade 5, an outer elastic skin 6 of the blade and an independent trailing edge 7. The said The section of the blade frame 1 is radially fixed by the connecting beam 2, and a guide groove 8 is provided in the section of the blade frame 1. In the guide groove 8 and at the trailing edge of the blade frame 1, a miniature electric push rod 3 is fixed respectively, and the blade movable beam 4 The two ends of the blade extend into the guide grooves 8, the blade frame 1 is provided with a blade inner layer 5, and the movable beam 4 is wrapped in it, and an independent tail that cooperates with the trailing edge of the blade frame 1 is arranged on the trailing edge of the blade frame 1. The edge 7, the blade inner layer 5 is provided with a blade outer elastic skin 6 which can wrap the whole structure, and constitutes the outer shell of the blade.

The number of the guide grooves 8 is 4-6.

Beneficial effects of the present invention:

1) During the operation of the wind turbine, the wind meter monitors the wind speed and transmits the signal to the blade deformation controller to control the miniature electric push rod 3 fixed on each blade frame 1 to work, and then push the movable beam 4 to move up and down, reflecting the On the inner blade layer 5 and the outer elastic skin 6 of the blade, the shape of the blade undergoes different degrees of expansion and contraction, and at the same time, the two miniature electric push rods 3 at the trailing edge of the blade frame 1 are controlled to work in opposite directions, so that the The independent trailing edge 7 of the blade produces a certain angle of deflection, which changes the aerodynamic shape of the wind turbine blade and controls the power output of the wind turbine;

2) The deformable blade of the present invention deforms according to different wind speeds, adjusts the aerodynamic performance of the blade, controls the power output of the wind turbine, and can replace the pitch control system of the traditional wind turbine.

Description of drawings

Figure 1. Schematic diagram of the deformed blade section

Figure 2. Sectional assembly diagram of deformed blade

Figure 3. Schematic diagram of the blade skeleton

Figure 4. Schematic diagram of connecting beams

Figure 5. Schematic diagram of the movable beam

Figure 6. Schematic diagram of miniature electric actuator

Figure 7. Schematic diagram of blade deformation at low wind speed

Figure 8. Schematic diagram of blade deformation at high wind speed

Figure 9. Schematic diagram of blade shape under three working conditions

In the figure: blade skeleton 1, connecting beam 2, miniature electric push rod 3, movable beam 4, blade inner layer 5, blade outer elastic skin 6, independent trailing edge 7, guide groove 8.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings 1-9.

The present invention is composed of a blade frame 1, a connecting beam 2, a miniature electric push rod 3, a movable beam 4, an inner blade layer 5, an outer elastic skin 6 and an independent trailing edge 7, and the cross section of the blade frame 1 is connected by connecting The beam 2 is fixed radially, the blade frame 1 is provided with a guide groove 8 in the section, and the miniature electric push rod 3 is fixed in the guide groove 8 and at the trailing edge of the blade frame 1, and both ends of the blade movable beam 4 extend into the guide groove. In 8, the blade inner layer 5 is arranged outside the blade frame 1, and the movable beam 4 is wrapped in it, and an independent trailing edge 7 that cooperates with the trailing edge of the blade frame 1 is arranged on the trailing edge of the blade frame 1. An outer elastic skin 6 of the blade that can wrap the entire structure is arranged outside the inner layer 5 to constitute the outer shell of the blade. The number of the guide grooves 8 is 4-6. The number of the miniature electric push rods 3 arranged in the guide groove 8 is two, and the number of the miniature electric push rods 3 arranged at the trailing edge of the blade skeleton 1 is two. ), the miniature electric push rod 3 is in the middle position of the guide groove 8, and its top and bottom are supported by the miniature electric push rod 3 extending out of the same length, and fixed in the middle position of the guide groove 8. The movable beam 4 is made of FRP composite material, buried in the inner layer 5 of the blade, and the micro electric push rod 3 moves up and down along the thickness direction of the blade to realize the effect of blade deformation; the connecting beam 2 can The blade skeletons 1 are connected in the span direction to form the entire wind turbine blade structure.

The specific changes of the blade: when the wind speed is small, the miniature electric push rod 3 on the outer side of the blade frame 1, that is, on the side close to the outer elastic skin 6 of the blade, retracts back, and the miniature electric push rod 3 located on the inner side extends outward, Push the movable beam 4 to move upward, and the thickness of the blade section airfoil increases. The micro electric push rod 3 located above at the trailing edge of the blade skeleton 1 pushes outward, and the micro electric push rod 3 located below contracts inward. The combined effect makes the independent trailing edge 7 of the blade deflect downward, and the camber of the blade section airfoil increases. big. The aerodynamic performance of the blade is improved, and the output power of the wind turbine is increased; when the wind speed is too large, the micro electric push rod 3 located on the outer side of the blade frame 1 is pushed out, and the inner micro electric push rod 3 is retracted to push the movable beam 4 Moving down, the thickness of the blade section airfoil becomes smaller. The micro electric push rod 3 located above at the trailing edge of the blade skeleton 1 is retracted inward, and the micro electric push rod 3 located below is pushed outward. The combined effect makes the independent trailing edge 7 of the blade deflect upward, and the curvature of the blade section airfoil is reduced. . The aerodynamic performance of the blade is reduced, and the output power of the wind turbine is controlled to be constant to ensure the safe operation of the unit under large wind speeds; in Figure 9, A represents the change of blade shape under three working conditions: high wind speed, B rated wind speed, and C low wind speed .

The deformable blade of the invention deforms according to different wind speeds, adjusts the aerodynamic performance of the blade, controls the power output of the wind turbine, and can replace the pitch control system of the traditional wind turbine.

Claims (2)

1. Modified wind turbine blade, characterized in that: the generator blade is composed of a blade skeleton (1), a connecting beam (2), a miniature electric push rod (3), a movable beam (4), a blade inner layer (5). ), the outer elastic skin of the blade (6) and the independent trailing edge (7), the section of the blade skeleton (1) is radially fixed by the connecting beam (2), and the section of the blade skeleton (1) is provided with a guide groove (8), in the guide groove (8) and at the trailing edge of the blade skeleton (1), a miniature electric push rod (3) is fixed respectively, and both ends of the blade movable beam (4) extend into the guide groove (8), The blade frame (1) is provided with a blade inner layer (5) outside, and the movable beam (4) is wrapped therein, and an independent tail that cooperates with the trailing edge of the blade frame (1) is arranged on the trailing edge of the blade frame (1). The edge (7), the blade inner layer (5) is provided with a blade outer elastic skin (6) which can wrap the whole structure, and constitutes the outer shell of the blade. 2. The modified wind turbine blade according to claim 1, wherein the number of the guide grooves (8) is 4-6.

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