G0500-4-1 DBDプラズマ誘起噴流速度の電圧立ち上がり速度依存性([G0500-4]流体工学部門一般講演(4))

Abstract

The jet velocities induced by a dielectric barrier discharge (DBD) plasma actuator and their dependences of voltage surge gradient have been investigated by means of PIV system. A DBD plasma actuator with doughnut-shaped electrode generates axisymmetric jets by applying high voltage (V) and high frequency (f_p) square wave signals with various voltage surge velocities (dV/dt). Variations of velocity distributions of axisymmetric jets produced by DBD plasma actuator are measured for amplitude of input voltage, V_m = ±3.3 kV, and 2.5 ≤ f_p ≤ 10 kHz, and 50 ≤ dV/dt ≤ 1,000 volts/μsec. It is found that the speed of tangential jet reaches its maximum when the voltage surge velocity is in the range of 150 ≤ dV/dt ≤ 250 volts/μsec, and the intermittent peak currents occur in certain time scales (δt_s) and δt_s shortens, but also its pace of decrease gets smaller as dV/dt increases. Net power consumptions to generate DBD plasma have been also evaluated by real-time measurements of voltage and current.