抄録
In this paper, an attempt to control the spanwise phase of the velocity fluctuation in the flow over a cavity, utlizing the receptive nature of flow, is carried out. The final objective of this research is to suppress the aerodynamic noise generated from the separating flow. The active flow control technique with piezoelectric-devices is used and two types of actuator devices are tested. The first type is the uni-morph type actuator that expand or shrink parallel to the freestream, the other is the bi-morph type that would bend and vibrate its trailing edge vertically. Experimental results show that the flow field with a wavy structure 180 degree out of phase along the spanwise direction, can be formed using either type of the actuators. However, difference can be found in the yz-plane
