RBCC engine design based on the flow passge of DMSJ engine

The flow passage and combustion organization design of a DMSJ engine is carried out firstly.The specific impulse of the DSMJ engine is 1 029.6 s when M_∞=4.0, whereas it is 899.9 s when M_∞=6.0.A RBCC engine flow passage is obtained by placing a rocket engine on the isolation sidewall of the DMSJ engine.Investigation shows that the rocket shoulder and downstream flow passage scheme variation have limited influence on engine specific impulse when M∞ is lower.The RBCC engine specific impulse is 1052.8s when M_∞=4.0, with the same fuel injection mode as the DMSJ engine.In order to gain a comparable specific impulse to that of DMSJ engine when M_∞ is higher, the fuel injection mode of the RBCC engine should be different from the DMSJ engine.The combustion organization positions of two engines are both in the upstream flow passage when M_∞ is elevated.The specific impulse of RBCC engine is 887.8 s when M_∞=6.0, with the regulating of the fuel injection mode.Therefore, it is facile and feasible to design a RBCC engine based on traditional mature DMSJ engine.