Influence of mixture ratio of primary flow on secondary combustion flame stability of ejector rocket motor

Based on comprehensive analysis for combustion mode of ejector rocket, the numerical analysis of SMC+DAB hybrid combustion mode and direct connected experiments for the ejector rocket motor with fixed structure were carried out by means of the essential principle of dual-combustor ramjet. The influences of primary gas flow mixture ratio on the secondary combustion flame stability and properties of motor were analyzed. The results show that the SMC+DAB hybrid combustion mode is reasonable, and a proper primary gas flow mixture ratio tends to stabilize the secondary combustion flame and improve properties of motor. Either higher or lower primary gas flow mixture ratio is adverse. The appropriate primary gas flow mixture ratio under given test and parameter condition in this paper is about 0.7.