当量比和射流压力对激波聚焦起爆性能的影响

Investigation on the effects of equivalence ratio and jet pressure on the performance of detonation initiation via shock wave focus

中文关键词: 两级脉冲爆震发动机  当量比  激波聚焦  射流压力

英文关键词: 2-stage PDE  equivalence ratio  shock wave focusing  jet pressure

中文摘要:

      为研究当量比和射流压力对激波聚焦起爆性能的影响，以氢气和空气作为工质，在不同当量比和射流压力下对凹面腔中激波聚焦起爆爆震波的过程进行了数值模拟。结果表明，在产生稳定爆震的当量比范围内，激波聚焦的起爆性能随当量比的增大先提高，后降低，在当量比1.1时取得最佳值。射流压力的增大能提高激波聚焦的起爆性能，但提高程度呈下降趋势；它同时有助于扩大产生稳定爆震的当量比范围，计算表明在入口射流压力1.35、0.95、0.55MPa条件下产生稳定爆震的当量比范围分别为0.4~5.2、0.5~4.7、0.5~3.9。

英文摘要:

      To investigate the effects of equivalence ratio and jet pressure on the performance of detonation initiation via shock wave focus, numerical study was done on the detonation initiation under the condition of different equivalence ratios and jet pressures of hydrogen-air mixture. The results show that in the range of equivalence ratio where detonation can be initiated, the performance of detonation initiation via shock wave focus first increases and then decreases with the increase of equivalence ratio.The optimum value is obtained at the equivalence ratio of 1.1. The performance of detonation initiation via shock wave focus is improved with the increase of jet pressure, but the increasing trend decrease gradually. The appropriate equivalence ratio range for stable detonation initiation could be extend with the increase of jet pressure. The results show that the range for stable detonation initiation were 0.4~5.2、0.5~4.7 and 0.5~3.9 at the jet pressure of 1.35、0.95、0.55MPa, respectively.