Abstract
This paper illustrates a unipolar repetitive nanosecond surface discharge in the subsonic airflows at different velocities. The plasma images presented here indicate that the discharge modes vary with the changes in flow condition. The discharge is promoted in the airflows at a lower velocity. The discharge tends to be either inhibited or even extinguished when the flow velocity accelerates. However, the inhibited mode disappears probably due to the strong memory effect at high repetitive frequency of the pulse.
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