High-efficiency plasma synthetic jet exciter based on steam pressure enhancement

Abstract

The invention provides a high-efficiency plasma synthetic jet exciter based on steam pressure enhancement. The high-efficiency plasma synthetic jet exciter comprises an insulating shell (10), a grounding electrode (20), a high-voltage electrode (30), an ultrasonic atomization sheet (40), a cotton swab (50) and a water storage tank (60). The working process of the high-efficiency plasma synthetic jet exciter based on steam pressure enhancement in a complete period comprises three stages: an atomization filling stage, an electric arc heating stage and a pressurized jet stage. Compared with a traditional exciter, the exciter provided by the invention adopts externally supplied atomized liquid drops as a working medium, so that the problems of insufficient backfilling and energy accumulation during high-frequency working do not exist. The high-frequency working temperature of the exciter is obviously reduced, and the jet density is increased. Meanwhile, more heat energy can be converted into jet flow mechanical energy, so that the energy conversion efficiency of the exciter is greatly improved.

Description

technical field [0001] The invention relates to the field of active flow control, in particular to a high-efficiency plasma synthetic jet exciter based on steam pressure enhancement. Background technique [0002] As a new type of active flow control actuator, plasma actuator has the advantages of fast response, high frequency response, simple structure and no moving parts. Applied to the aviation field, it is expected to significantly reduce the flight resistance of the aircraft, increase the maximum lift, increase the range, and expand the working stability of the engine. Among the commonly used plasma exciters (such as dielectric barrier discharge, pulsed arc, radio frequency discharge), the plasma synthetic jet exciter has the advantages of high excitation intensity and high jet velocity (supersonic speed), so it is especially suitable for high-speed, high-speed Shock wave / boundary layer mutual interference control, shock wave control, shear layer control, etc. under Rey...

AI Technical Summary

Problems solved by technology

However, the exciter has outstanding shortcomings such as insufficient air backfill and heat accumulation in the cavity during high-frequency operation, which lead to a sharp increase in temperature (700-1000K) and a decrease in jet density (only atmospheric density) when the exciter operates at high frequency. 10%-30%), the energy conversion efficiency is extremely low (<1%), and even the phenomenon of jet "misfiring" may appear (1, Narayanaswamy V, Raja L L, Clemens N T.Characterization of a high-frequency pulsed- plasma jet actuator for supersonic flow control[J].AIAAjournal, 2010, 48(2):297-305.2, Zong H, Wu Y, Li Y, et al.Analytic model and frequency characteristics of plasma synthetic jet actuator[J].Physics offluids, 2015, 27(2): 027105.)

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