The unsteady flow field around a single microsecond pulse (MP) DBD plasma actuator in quiescent air is investigated using Particle Image Velocimetry (PIV), Schlieren visualization and a pressure-field microphone. A single microsecond pulse with a rising time of 75 μs and a decaying time of 65 μs was employed. It is of great significance that a series of planar type pressure waves induced by the MP-DBD plasma actuator propagates outwards in the rising period is First observed. It is likely that the streamer discharge which occurs in the rising stage, conducing to numerous current pulses with energy release, plays an important role in generating these pressure waves. During the plateau of the constant voltage of 10 kV, a wall jet which has a deflection angle of 60° is formed, while a new type of arched jet is observed during the plateau of the constant voltage of 0 kV. These wall jets provide favorable conditions for creating some perturbations and promoting mixing between the mainstream flow and the boundary flow.
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