Theoretical Study of Influence of Jet Flow on Propagation of Detonation Wave

To study the influence of jet flow on the propagation of detonation wave,the deflagration-to-detonation transition(DDT)process were numerically simulated aiming at two cases:physical obstacle and jet flow in detonation tube.The results show that detonation was achieved under the two conditions.Jet flow undergoing a complex process with the flame in the detonation tube can accelerate the flame velocity in the pre-mixed combustible mixture;thus the DDT process can be strengthened.Compared with the case of utilizing physical obstacle,the case of adopting jet flow in the detonation tube can shorten the DDT run-up distance by 15.4%.The results provide theoretic guidance for experiment of pulse detonation engine.