Influence of injection nozzle configuration on configuration matching of unchoked ducted rocket

Using RANS and k-ε turbulence model, the influence of fuel-rich injection nozzle configuration on the combustion efficiency of unchoked ducted rocket was studied. Based on the analysis of the streamline of primary and secondary flow in secondary combustion chamber, flow-in position concept was put forward. The results indicate that higher combustion efficiency was obtained if the primary injection nozzle was designed by the flow-in position method. Meanwhile, temperature field in this situation is in favor of thermal structure of secondary combustion chamber. Configuration matching of ducted rocket engine will be achieved.