多爆震室串联热射流起爆实验研究

为消除现有脉冲爆震发动机对外部脉冲起爆装置的依赖并提高脉冲爆震燃烧室工作频率,提出了一种多个爆震室封闭串联的多管燃烧室方案,通过管间的射流传递实现爆震室内的快速短距离起爆.实验结果表明,多个爆震室间可以实现逐级射流起爆,并且可以实现快速起爆,起爆所需要的时间约为1.0～1.2ms,起爆距离约为500mm,远远小于火花塞直接点火时的结果.弱火焰射流可以通过逐级增强的方式最终在下游某个爆震单元内形成爆震波.单个爆震室内射流进入和射出的时间间隔可以达到1.2～1.5ms,大约需要8个爆震单元才可能实现爆震波的封闭串联传播.

Hot jet initiation of detonation in serial detonation chambers

To avoid the dependence of external pulse ignition source and increase operating frequency of a pulse detonation engine, a novel serial detonation chambers scheme PDE was offered. Detonation was initiated through hot jet from conjoint detonation chamber, from one to the next. Experimental results show that the hot jet can spread through chambers and each chamber can be initiated fast in a short distance. The initiation time is about 1.0～1.2ms, and the distance is about 500mm. Weak hot jet also can be enhanced after a few tubes and initiate mixtures in a certain chamber downstream. The time between jet-in and jet-out in one chamber is 1.2～1.5ms, considering other time in a whole cycle, maybe 8 chambers are needed for running at the mode of close spread jet.