Abstract
Control of the velocity fluctuation in the turbulent separation flow over a cavity with a resonator is attempted. The objective of this research is to reduce the aerodynamic noise generated by the separating flow. Active flow control technique using the piezoceramic device that expands or shrinks parallel to the freestream is carried out. Experimental results show that though it is difficult to change a structure of the velocity fluctuation field, by adding devices such as partition plates inside the cavity and resonators, a wavy pattern that is 180 degree out of phase along the spanwise direction can be created. Reduction in the aerodynamic noise due to the control is also observed.
