A wind turbine blade with improved stall characteristics based on fractal optimization

Abstract

The invention discloses a wind turbine blade capable of improving stalling characteristics based on fractal optimization. The wind turbine blade comprises a blade body positioned at the front part corresponding to a flow incoming direction, and a blade tail edge positioned at the back part corresponding to the flow incoming direction; the blade tail edge is distributed with multiple elastic pieces and fractal holes with fractal structures; the elastic pieces are arranged on suction surface sizes of the fractal holes, and are suffered from a pressure difference effect of a blade pressure surface and a suction furnace to locate in a closing or opening state; and the fractal holes penetrate through the pressure surface and the suction furnace. When the blade incoming flow attack angle dose not reach stalling conditions, as the pressure difference between the blade pressure surface and the suction surface is smaller, and at this time, the elastic pieces are located in the closing state to stop passing of a fluid to stop small-scale turbulence so as to guarantee the blade pneumatic performances; when the blade incoming flow attack angle is increased to reach the stalling conditions, the elastic pieces are located in the opening state due to the effect of pressure difference, and the fluid can pass through the fractal holes to generate small-scale turbulence on the suction furnace to delay separation of a blade surface boundary layer, so that the formation of stalling clusters is delayed, and the purpose of improving the blade stalling characteristics is achieved.

Description

technical field [0001] The invention relates to a wind turbine blade capable of improving stall characteristics based on fractal optimization. The wind turbine blade can not only ensure the aerodynamic performance of the blade, but also improve the stall characteristic of the blade. Background technique [0002] Wind energy is a clean renewable energy, and wind power generation is an important field for the development of renewable energy. As an important equipment for wind power generation, wind turbines play an extremely important role in the development of wind power in my country. The blades of wind turbines determine the utilization rate of wind energy and are the core components of the entire wind turbine. [0003] When the angle of attack of the incoming flow of the blade does not reach the stall condition, the blade has greater lift and less resistance, and the fluid flows past the surface of the blade; when the angle of attack of the incoming flow of the blade incre...

AI Technical Summary

Problems solved by technology

Forming a fixed vortex through the pits on the surface of the blade and using the centrifugal force of the fan to pull the lever to make the inner and outer friction plates contact and decelerate have a certain effect in improving the stall characteristics of the blade, but the structure is complex and costly, and the complex control system and structure will also Reduced reliability of wind turbine blade operation

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