三点火源与障碍物起爆特性对比研究

The Comparative Study of Detonation Initiation Performance of Three Successive Ignitions and Obsticles

针对脉冲爆震发动机,为了拓宽两点火源顺序点火起爆的间隔时间范围,对同一点火能量下不同点火源间隔以及同一点火源间隔下不同时间间隔的三点火源顺序点火过程以及两点火源并布置障碍物的起爆过程进行了数值模拟。计算结果表明,三点火源和布置障碍物均有利于起爆;各点火源产生的波叠加作用和因障碍物存在而产生的横波和热点均对于起爆有明显的增进作用。综合应用2种增爆方式可以有效拓宽起爆的时间间隔范围,促进起爆。

In order to broaden the interval of two successive ignitions with which the detonation wave was initiated, 2-D numerical simulation was conducted to observe the process of detonation initiated by three successive ignitions and two successive ignitions with obstacles. Stoichiometric propane-air mixture was used as the fuel-oxidizer. The re- sult of the simulation indicated that better detonation initiation performance was obtained by three successive igni- tions and obstacles. The comprehensive function of pressure waves generated by different ignition, the transverse waves and local thermal points generated by the obstacles, can all promote the performance of detonation initiation. The ignition time interval of the ignitions was widen by utilizing three successive xgnmons with both of the ignition triggering methods.