Self-adaptive flexible blade of vertical-shaft wind turbine

Abstract

The invention relates to a self-adaptive flexible blade of a vertical-shaft wind turbine. Flexible pneumatic shrapnels are arranged on the surface of the blade and are used for adjusting the flow regime around the blade in a self-adaptive manner, restraining and slowing down flow separation and vortex shedding when the blade is under a stall condition, and improving the self-starting capacity of the wind turbine. The flexible pneumatic shrapnels are arranged along the height of the blade; each row of flexible pneumatic shrapnels is uniformly arranged along the surface of the blade. The roots of the flexible pneumatic shrapnels are bonded with the surface of the blade. According to the invention, through arranging a series of flexible pneumatic shrapnels similar to bird's feathers on the surface of the blade, the flexible pneumatic shrapnels can adjust the form according to the flow regime in a self-adaptive manner and macroscopically shows the flexible blade when the blade is at different angles of attack; the blade can slow down large separation vortex and vortex shedding when the blade is under a stall condition and can also provide larger resistance to help the wind turbine start in a self manner when fluid is from the rear of the blade.

Description

technical field [0001] The invention relates to a blade of a vertical axis wind turbine, in particular to an adaptive flexible blade. Background technique [0002] Wind turbines are mainly divided into two types: horizontal axis and vertical axis, and vertical axis wind turbines are further divided into drag type and lift type. Lift-type vertical axis wind turbines can obtain wind energy in any direction without complex steering devices, and have a simple structure and easy maintenance, and are widely used in the field of wind turbine power generation. [0003] Existing vertical axis wind turbines still face some problems in operation: on the one hand, the angle of attack of the blades changes greatly periodically during self-starting or low-speed rotation, and they are often in a large stall state, and the blades provide small torque for the wind turbine. It not only affects the self-starting of the wind turbine, but also affects the acquisition of wind energy by the wind ...

AI Technical Summary

Problems solved by technology

[0003] Existing vertical axis wind turbines still face some problems in operation: on the one hand, the angle of attack of the blades changes greatly periodically during self-starting or low-speed rotation, and they are often in a large stall state, and the blades provide small torque for the wind turbine. It not only affects the self-starting of the wind turbine, but also affects the acquisition of wind energy by the wind turbine; on the other hand, the blades in the stall state cause strong vortex shedding wakes, which affect the blades / wind turbines in the downwind area to obtain wind energy. Caused a strong alternating load, affecting the performance of the wind turbine

Adjusting the installation angle of the blades in different orientations has certain effects on improving the self-starting performance of the wind turbine and preventing the overload of the wind turbine, but to a certain extent, it affects the acquisition of wind energy by the wind turbine at rated working conditions and low speeds. The suppression effect of blade dynamic stall and vortex shedding is not good

Complex structures or control systems will also reduce the reliability of vertical axis wind turbines

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