Abstract: Euler equations with chemical reaction were used to compute the problem of detonation initiation by hot jet in supersonic premix flow. While the flow is faster than CJ(Chapman-Jouguet) detonation velocity, the bow shock wave induced by the jet has an important effect on detonation initiation. Transverse waves arising from instability of detonation wave are the key factors to determine whether the detonation waves initiate completely. The angle of hot jet can impact the initiation and stationary properties. Decreasing the jet angle may result in three situations:steady after initiation, unsteady after initiation and unsuccessful initiation.

Key words: Supersonic flow； Hot jet； Detonation initiation；Numerical simulation

摘要： 采用带有化学反应的Euler方程,对超声速预混气的热射流起爆过程进行了研究。在来流速度大于CJ(Chapman-Jouguet)爆震速度的情况下,射流所导致的弓形激波在爆震波起爆过程中起到了重要作用,而爆震波不稳定性导致横波的产生是决定能否完全起爆的关键因素。射流角度的改变能够影响到起爆的过程与驻定性质。随着射流角度的逐渐减小,会出现起爆后驻定、起爆后不能驻定以及起爆失败三种结果。 

关键词: 超声速;热射流;起爆;数值仿真