Experimental Investigation on the Characteristics of RF Discharge Plasma Aerodynamic Actuation
To improve the intensity of plasma aerodynamic actuation (PAA) and its flow control ability,we experimentally investigated the characteristics of RF discharge PAA.We established an experimental system,which is composed of a RF signal generator,an impedance-matching transformer,a plasma actuator of pin-pin configuration,etc.The pin-pin configuration consists of two tungsten electrodes captured by a bakelite holding device,which is designed to maintain a fixed gap,and the electrodes are aligned to form a 0.5 mm gap between their tips.Then we tested the characteristics of RF discharge PAA in quiescent air.The test results show that the impedance of plasma actuator and the input power vary with pressure.At atmospheric pressure,the pin-pin electrode RF discharge heats up the air around the electrodes rapidly and induces cylindrical shock wave in quiescent air.The shock wave spreads at the speed of sound firstly,and its strength decreases in the spreading process before it finally attenuates into weak disturbance after a certain while.RF power supply,repetitive pulsed DC power supply,and nanosecond-pulse power supply can all be used to generate shock waves with velocity close to sound wave.However,among the three,RF discharge requires the smallest and lightest power supply,as well as the smallest input power after impedance matching,so it is very promising for plasma flow control.
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