プラズマアクチュエータ誘起流の逆流特性に関する実験的研究

概要

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The effects of the applied voltage and electrode dimensions on the backward jet induced by a dielectric barrier discharge plasma actuator (DBD-PA) are investigated experimentally. The applied voltage waveform used in this study is a pulse waveform with an amplitude VPP = 8 kV (-8 kV ≤ V ≤ 0 kV) and a frequency f = 5 kHz. With respect to duty ratio D of the applied voltage waveform, it is found that the backward jet induced by the DBD-PA is only generated for 93% ≤ D ≤ 93.5%. On the other hand, the forward jet is only generated for 10% ≤ D ≤ 92%, and the velocity and direction of the jet are significantly dependent on the duty ratio. These jets do not occur when D < 10% and D > 93.5%. With respect to the electrode width, the backward jet is generated for an upper electrode of sufficient width (10 mm in this study), even if the lower electrode width is short. In contrast, the forward jet is generated when the upper electrode width is short (5 mm or less), and the velocity of the jet increases as the upper electrode width decreases.
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