Journal of Applied Mechanical Engineering

Characteristics of near-surface discharge plasma actuation driven by radio frequency voltage and its control effect on supersonic flow

3^rd International Conference on Fluid Dynamics & Aerodynamics

October 25-26, 2018 | Berlin, Germany

Huimin Song

Air Force Engineering University, China

Posters & Accepted Abstracts: J Appl Mech Eng

Abstract:

The characteristics of near-surface discharge plasma actuation driven by radio frequency voltage have been investigated experimentally. The discharge images and the voltage-current waveforms in quiescent air and supersonic flow of Ma 2 are recorded. Compared with discharge in quiescent air, the value of voltage increases and the value of current slightly decreases. Meanwhile, the discharge morphology changes from stable constrained mode in quiescent air to periodic evolved discharge mode in supersonic flow. Through time-resolved Schlieren method, the characteristic of RF discharge plasma actuation is studied. A stable shock wave as well as heat volume induced by RF discharge can be observed. In the experimental investigations on oblique shock wave control by RF discharge plasma actuation, the original oblique shock wave induced by ramp is scattered into several compression waves, the shock wave intensity is weakened, and the shock wave moves forward. The mechanism of RF discharge plasma actuation on shock wave control is mainly heat effect, which is different from that of pulsed-arc discharge. The influences of load power and plasma actuation position on shock wave control effect are also investigated experimentally. With higher load power of RF discharge plasma actuation, the variation of shock wave position and shock wave angle increases apparently. When the plasma actuation position is nearest to the ramp, the position of the shock wave mostly changes and the intensity of the shock wave decreases. In fact, the heat volume induced by RF discharge plasma actuation dissipates when it moves along the boundary layer, and it dissipates less when the distance is shorter.

Biography :

E-mail: min_cargi@sina.com