Control of wall-separated flow by internal acoustic excitation

We explore the control of wall-separated flow on a NACA 63 3 -018 airfoil and a circular cylinder by using the internal acoustic excitation technique. Experimental study of the characteristics of the flow under internally emanating acoustic waves is performed in an open-type, suction wind tunnel. Tests are carried out at the Reynolds number ranging from 6.3 × 10 3 to 5.0 × 10 5 based on the relevant characteristic lengths, the airfoil chord, and the cylinder diameter