Numerical Study on Supersonic Inlet Buzz Under Various Throttling Conditions and Fluid-Structure Interaction

Abstract

This paper presents numerical investigations on the buzz characteristics of a supersonic inlet. By applying dynamic throttling conditions and using FSI (Fluid-Structure Interaction) technique, we were able to match operating conditions close to the real cases. In order to evaluate the effects of the dynamic throttling conditions and FSI, numerical simulations of a supersonic inlet configuration were performed sequentially for the following three stages. At first, the physical phenomena related to the inlet buzz such as shock-shock and shockboundary interactions were studied under static throttling condition. In the second stage, the effect of the dynamic throttling ratio on the inlet buzz was examined. A dynamic throttling condition is assumed that the inlet is initially in high frequency buzz condition, from which throttling plug at the exit nozzle starts to move. Finally, the structural deformation effect was figured out using FSI for the same throttling conditions. The results of these studies reveal the detailed effects of the throttling ratio and the structural deformation on the buzz characteristics.