Abstract
The performance of active feedback control of edge tone phenomenon by the control flow is investigated experimentally and the mechanism is discussed. It is found that the pressure fluctuations over the edge surface are reduced by this control roughly to those of the free jet. The optimum conditions for the phase lag and amplitude of the control flow are obtained quantitatively for various edge distances from the jet nozzle. These results show that the present control technique is very effective for weakening the flow oscillation of the jet-edge system. The flow visualization study suggests that the control mechanism is due to the cancellation of pressure fluctuations created at the edge by the imposed velocity fluctuations.
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