Study of shock and induced flow dynamics by pulsed nanosecond DBD plasma actuators

The shock wave behaviour generated from a single shot of nanosecond DBD plasma actuator with varying pulse voltages in quiescent air was studied by experiments and numerical simulations. The experiments includes Schlieren technique, a fast response pressure transducer and a two-velocity-component PIV system to measure the propagation of the shockwave, the shock overpressure and the shock induced flow, respectively. For the numerical simulation, a simple “phenomenological approach” is employed by modelling the plasma region over the covered electrode as a jump-heated and pressurized gas layer. The present investigation reveals that the behaviours of the shock wave generated by the nanosecond pulsed plasma is fundamentally a micro blast wave and its speed and strength is found to be increased with higher input voltages. The blast wave occurs in about 1 to 4 μs after the discharge of the nanosecond pulse, which is dependent on the input voltages, and decays quickly from supersonic to sonic level within about 5μs (2-3mm from the actuator surface). The shock induced burst perturbations (overpressure and induced velocity) is found to be restricted to a very narrow region (about 1mm) behind the shock front and last only for a few microseconds. While a fairly weak induced vortex flow is observed in a relative long time period after the discharge of the plasma. These results imply that the pulsed plasma actuators have stronger local effects in time and spatial domain.

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