Simulation of Nanosecond Pulsed DBD Plasma Actuation with Different Rise Times.

NPDBD plasma actuation is a novel method for active flow control. In Benard's paper, compression waves induced by NPDBD plasma actuation with shorter rise time are stronger. But the mechanism is still not clear yet. In this paper, NPDBD plasma actuation with different rise times are simulated using a two-dimensional plasma-fluid coupled model. Along with the decrease of rise time from 150 ns to 50 ns, discharge current, peak power, and input energy increase with constant voltage amplitude. The whole ultrafast heating energy and heating efficiency also increase, while the ratio of quenching heating and ion-neutral collision heating remains almost unchanged. Due to higher heating energy, the strength of the induced compression wave also increases with the shorter rise time. The variation law of discharge current and compression wave strength is consistent with the trends observed in Benard's paper. The main mechanism for higher ultrafast heating energy and efficiency with shorter rise time is that both maximum reduced electric field and electron density are higher. Evolution of reduced electric field, electron density, heating distribution, and induced compression wave are also presented. [ABSTRACT FROM AUTHOR]