Experimental study on the time-delayed-phase-control for reduction of open cavity noise

A flow over an open cavity can cause a resonance which is a feedback mechanism between the acoustic waves and the pressure fluctuation of the cavity flow. Time-delayed-phase-control (TDPC) method can suppress the cavity resonance. Mechanism of the noise reduction in the TDPC is different from the general active methods for noise cancellation. This paper presents an experimental study on the control effects of the TDPC method. The experimental results are compared with the analytical results, and show substantial conformance.