抄録
The acoustic and fluid dynamic resonance in a two-dimensional cavity flow was investigated experimentally. In order to visualize a periodic oscillation of the shear layer and the behavior of vortices, a schlieren method was engaged with an ordinary CCD camera and high-speed video cameras. Particle image velocimetry (PIV) measurement was also carried out to obtain the vorticity distribution during the oscillation of the cavity flow. Shedding and interaction of vortices in the shear layer were observed near the trailing edge of the cavity, which causes the generation of pressure waves. The feedback process of the oscillation was determined using high-speed camera images. From these results, the oscillation cycle was indicated in an x-t diagram. From the x-t diagram, Rissiter's integers in his formula were determined. The result obtained PIV measurement show the outgoing and incoming flow neat the trailing edge of the cavity. It was confirmed that the fluid dynamic instability due to the shear layer caused a large mass flow near the trailing edge.
