Study on Opposing Jet Simulation of Near Space Supersonic Vehicle Based on DSMC Method

There are serious aerodynamic heating and high resistance phenomena for near space supersonic aircraft. Application of opposing jet flow is an effective technology for drag and heat reduction. This paper uses DSMC method to simulate the external opposite flow of aircraft moving in the supersonic flow in rarefied environment of near space. It analyzes the advantages and disadvantages of drag and heat reduction of opposing jet in the different conditoins by adjusting speeds of the jet in order to obtain an optimized scheme. The numerical results show that the peak values of aircraft surface pressure, surface heat flux and friction are reduced by 76.6%, 93.5% and 50.0% respectively. Application of opposing jet in rarefied environment can effectively reduce the drag and aerodynamic heating for supersonic aircraft. The present study provides an effective reference for the aircraft design on the drag and heat reduction.