Abstract
An experimental study is performed for channel flow over a backward-facing step with the burst wave induced plasma actuator (PA) as a flow control device adding a periodic disturbance. PA is installed on the corner edge of the step. The Reynolds number Re based on the mean velocity and the hydraulic diameter of inlet channel ranges from 2.0×10^3 to 5.5×10^3. The wall static pressure is measured, and the pressure improvement coefficient is evaluated. The velocity profiles around the step are measured using PIV system. The pressure improvement coefficient increases by the induced flow with PA. The effect becomes remarkable as the duty ratio increases. The reattachment length becomes shorter as the duty ratio increases. The reduction rate at burst frequency f_b = 100 Hz, duty ratio D = 75% and Re = 2.0×10^3 is larger than the continuous wave.
