Synthetic jet actuator and horizontal-axis wind turbine blade

Abstract

The invention provides a synthetic jet actuator which performs periodic air blowing and suction through repeated oscillation of a piezoelectric film to convert consumed electric energy into fluid kinetic energy. The synthetic jet actuator comprises a cavity, the long-strip-shaped piezoelectric film, a long-strip-shaped piezoelectric actuator and an air bleeding channel; the cavity has a lower opening and an upper opening; the area of the section of the lower opening is larger than that of the section of the upper opening; the long-strip-shaped piezoelectric film covers the lower opening in a matched manner; the long-strip-shaped piezoelectric actuator is arranged below the piezoelectric film; the air bleeding channel is connected with the upper opening in a matched manner; and the long-strip-shaped piezoelectric actuator is driven by a rectangular pulse signal to have the inverse piezoelectric effect, the piezoelectric film is driven to oscillate up and down periodically, air in the cavity oscillates along with the piezoelectric film, and then the periodic air blowing and suction effect is produced in the air bleeding channel. The invention further provides a horizontal-axis wind turbine blade comprising the synthetic jet actuator. By the aid of the blade, flowing control can be realized, so that the strength of the trailing vortex of a wind turbine is reduced, the dissipationof the trailing vortex is accelerated, oscillation of the wind turbine blade is reduced, and the service life of the wind turbine is prolonged.

Description

technical field [0001] The invention relates to the field of aerodynamics, in particular to a synthetic jet exciter and a horizontal axis wind turbine blade provided with the synthetic jet exciter. Background technique [0002] With the development of aerodynamics and the breakthrough of related technologies, the flow control technology has developed rapidly. Flow control technology is a technology that uses special structures or special devices to control local flow fields or global flow fields, and is common in various fluid machinery. Active flow control technology (active flow control, AFC) greatly improves the local or global flow field structure due to local energy input, which can effectively reduce the aerodynamic loss caused by flow separation. Therefore, AFC technology has become one of the research hotspots. [0003] However, the blowing and inhaling air flow control solution in the prior art still has disadvantages: additional air sources, pipelines and control...

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Problems solved by technology

[0003] However, the blowing and suction flow control schemes in the prior art still have disadvantages: additional air sources, pipelines and control valves are required, resulting in a large increase in extra weight and a decrease in system reliability due to complex structures

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