Introduction
Cavity flow is a problem often encountered in practical engineering, and is currently a hot aerodynamics
research field internationally. there are a variety of complex unsteady cavity flow such as aircraft landing gear,
weapons bay, car sunroof and so on. When the flow passes over the cavity, flow oscillation will be produced
and radiate noise. The research of cavity flow typically involving complex flow-sound-vortex interference,
unsteady character and shear layer instability problems, which has great research significance.
For the study of cavity flow, since the 1950s, more tests have been carried out, and since the 1980s,
numerical simulation was widely used in cavity flow study on mechanism and flow control design. Certain
Studies [1-8] showed that the geometric parameters such as the length to depth ratio L/D, the aspect ratio W/D,
flow parameters such as Mach number affect the cavity flow pattern and the acoustic characteristics.
In this paper, experiment platform for cavity flow studies was built in low-turbulence wind tunnel, with the
use of wall pressure sensors and microphones, the effects cavity geometry on low-speed cavity flow
oscillation characteristics were studied experimentally and provide reference for cavity noise suppression
research.