Effect of Geometry Parameters on Low-speed Cavity Flow by Wind Tunnel Experiment

In this paper, experiment platform for cavity flow is built in low-turbulence wind tunnel. based on the measurement of wall static pressure and sound pressure with microphones, the basic flow oscillation characteristics of different type cavity in low speed are studied. The effect of geometry parameters of length to depth ratio and width to depth ratio on cavity flow pattern and noise characteristics is obtained. The results show that in the incompressible flow state, the basic flow pattern of cavities is not affected by flow velocity; length-to-depth ratio of 1 to 12 covers the flow pattern from open to close, and with the length-to-depth ratio increase, the cavity radiation SPL increases; with aspect ratio increase, the sound pressure energy of cavity also increase.