Pressure wave production by surface dielectric barrier discharge supplied by positive and negative fast-rising high voltage pulses

摘要

Recent investigations demonstrated the potential of fast-rising pulsed dielectric barrier discharges as an effective flow control device. In the present works, electrical and optical measurements of a fast-rising pulse DBD operated in quiescent flow are conducted. The study focuses on the influence of the pulse polarity and theirs consequences in terms of energy deposition at the wall surface and pressure wave initiation. Fast-imaging acquisition indicates that the structure of the plasma is deeply affected by the polarity of the HV pulse. Positive HV pulse presents filamentary behaviour in the discharges occurring during the rising and decaying periods of the pulse. Opposingly, a negative HV pulse produces more homogeneous discharges with corona discharge propagation in plume shape. Finally, this paper highlights the effect of the pulse width to produce successive series of pressure waves.