Wind turbine blades for broadband active control

Abstract

The invention relates to a novel wind driven generator blade for broadband active control. The novel wind driven generator blade comprises a blade body and a plurality of jet components, the jet components are arranged below the surface of the blade body, the jet components are arranged along the upstream side of an airflow separation line on the surface of the blade body and are mainly arranged in a high-lift section close to a blade tip, and the surface of the blade body is provided with a plurality of jet outlets communicating with jet ports of the jet components. The jet components are lowReynolds number plasma synthetic jet exciters. The plasma synthetic jet exciters are driven by a high-frequency direct-current pulse power source to generate high-speed synthetic jet, the surface flow of the wind driven generator blade is controlled, the flow separation of the suction surface of the blade is overcome through the jet active control method, the high pneumatic performance can be achieved in a larger incoming flow attack angle range, the working resistance and the unsteady pneumatic load of the wind driven generator blade are reduced, and the power generation efficiency and stability of a wind driven generator are improved.

Description

technical field [0001] The invention belongs to the field of active control of wind power generator blades, and in particular relates to a wind power generator blade for broadband active control. Background technique [0002] With the aggravation of the energy crisis, many countries are constantly developing renewable energy, and wind energy is an important part of it. The number of wind power generators in the world is huge. It is of great significance to study the aerodynamic characteristics of wind turbine blades and improve efficiency and stability. [0003] Commonly used horizontal-axis wind turbines operate in a complex working environment, and the aerodynamic parameters (speed, angle of attack, etc.) of the incoming gas vary greatly. Steady separation leads to dynamic stall of the blades, which increases the unsteady aerodynamic load of the wind turbine, which has a great impact on the aerodynamic performance and structural fatigue life of the wind turbine, and reduc...

AI Technical Summary

Problems solved by technology

The blowing and suction air flow control scheme in the prior art requires additional air sources, pipelines and control valves, thus resulting in a large increase in additional weight and a decrease in system reliability due to complex structures

A wind turbine blade based on a dielectric barrier discharge plasma actuator improves the aerodynamic characteristics of the blade surface, but the structure of the dielectric barrier discharge plasma actuator determines that the blade surface must have a protrusion structure, which obviously increases the surface resistance of the wind blade. Although this design makes the blade have more stable aerodynamic characteristics, it loses efficiency; a synthetic jet actuator that uses the piezoelectric film to repeatedly oscillate for periodic blowing and suction, and converts the consumed electrical energy into fluid kinetic energy, thus Improve the local or global flow field structure and reduce the aerodynamic loss, but its momentum output ability is weak, the control ability is not strong, and the response frequency is low

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