Passive Control Techniques to Alleviate Supersonic Cavity Flow Oscillation

Abstract

The effectiveness of two passive control techniques for alleviating the pressure oscillation generated in a supersonic cavity flow was investigated numerically. The control devices suggested in the present study include a triangular bump and a subcavity installed near the leading edge of a rectangular cavity. Time-dependent supersonic cavity flow characteristics with turbulent features were examined by using the three-dimensional, mass-averaged Navier-Stokes computation based on a finite volume scheme and large eddy simulation. The results show that the pressure oscillation near the trailing edge dominates overall time-dependent cavity pressure variations. Such an oscillation can be attenuated more significantly in the presence of the subcavity compared with the bump or blowing, and a larger subcavity leads to better control performance.