补气式等离子体合成射流激励器工作机制

doi:10.7527/S1000-6893.2021.25854

Abstract

Abstract: In order to improve the jet energy, a check valve is connected to the cavity of the conventional Plasma Synthetic Jet (PSJ) actuator to increase the air supply during the recovery stage. To prevent air leakage, the structure of check valve is specially designed. When the inlet of the check valve is open or closed, the peak velocity of the jet, the pressure inside the cavity, the discharge voltage and the discharge current of the actuator are measured respectively, and the working mechanism of the check valve to improve the jet performance is explored. The results show that the improved check valve can significantly improve the performance of PSJ. The jet height is increased by 30.0%, the jet peak velocity is increased by 18.7%, and the jet effective area is expanded by 76.3%. However, its effective working frequency range is still closely related to the response frequency of the check valve, the ability to withstand the reverse impact pressure and the saturation working frequency of the actuator. The working mechanism of the air-supplemented check valve is that the positive feedback is formed between the air supply and discharge of the actuator. Through the check valve, the area of the air inlet is expanded in the recovery stage and the recovery is more sufficient. Therefore, the air pressure in the cavity is increased, which increases the breakdown voltage of the gas, increases the discharge energy in the energy deposition stage, increases the peak discharge pressure, and produces a greater internal and external pressure difference, so as to improve the jet performance.

Key words: plasma synthetic jet, air supplement check valve, jet performance, spark discharge, discharge parameters

CLC Number:

V224⁺.5

LIU Rubing, WEI Wentao, LI Fei, LIN Qi. Working mechanism of air-supplemented plasma synthetic jet actuator[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(8): 125854-125854.

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Working mechanism of air-supplemented plasma synthetic jet actuator

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