Active Control of Flow-Induced Cavity Noise Using a Plasma Actuator

Abstract— An experimental study of the effect of high-frequency surface barrier discharge plasma actuators on flow-induced cavity tonal noise has been carried out. Tonal noise reduction in the far field is demonstrated using two approaches: excitation of artificial waves corresponding to high-frequency modes and flow stabilization using a plasma actuator in a feedback loop. It is shown that the stabilizing feedback loop makes it possible to significantly ( up to 10 dB) suppress the fundamental tone without excitation of higher-frequency oscillations. It is shown that these plasma actuators can reduce flow cavity noise within the range of velocities (up to 60 m/s) typical of aircraft landing approach