Suppression effect of jet flow on aerodynamic noise of 3D cavity

The structure of cavity flow field with high mach number is very complex, in which pressure and velocity pulsate seriously, leading a seriously noise about almost 170dB. The noise poses a great threaten to the safety of the missile in the cavity and the structure of the cavity. The active control method(jet flow) by applying the CFD technology based on Scale-Adaptive Simulation(SAS) model developed from two-equation SST turbulent model is used to simulate the changing of the dynamic noise in the standard cavity M219(the ratio of the length to the depth is 5), and studied the flow character, flow field structure and noise mechanism. First, the accuracy of the noise prediction method is validated. Base on above-mentioned method, the suppression effect on the noise in the cavity of jet flow is analyzed and the conclusion is that jet flow has a great influence on the aerodynamic noise suppression in the cavity.