Parameter research on RBCC propulsion system

Based on Computational Fluid Dynamic technology, the mixing process of Rocket Based Combined Cycle (RBCC) propulsion system is researched. The idea of RBCC propulsion system means to combine rocket engine and ramjet engine effectively, which can flight from sea level to high flight in wide Mach ranges. Considered from operating process, flows from ramjet and rocket mixed together in the mixing part, and the mixture flow through a diffuser, where the mixture mixed with fuel and burning. Two different parameters are researched in order to analyse their effects on mixing process. Firstly, a basic mixing process is researched, the computation results show that, the flow distribution on the exit surface is not uniform, which could influence the performance of RBCC propulsion system. Moreover, for the purpose of improving its performance, the length of the mixing part is optimized. Besides, the mixing performance is analysed via changing back pressure.