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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1.350、0.950、0.550MPa条件下产生稳定爆震的当量比分别为0.4~5.2、0.5~4.7、0.5~3.9。
In order to study the effect of equivalence ratio and jet pressure on the initial detonation performance of shock wave, the process of focusing detonation wave in the concave cavity was numerically simulated with hydrogen and air as working fluid under different equivalence ratios and jet pressure. The results show that the detonation performance of shock focusing increases first and then decreases with the equivalence ratio of stable knocking, and the optimal value is obtained at equivalence ratio of 1.1. The increase of jet pressure can improve the initial performance of shock focusing, but the increasing degree shows a decreasing trend. It also helps to expand the range of equivalent ratio of stable knocking. The calculation shows that at inlet jet pressure of 1.350, 0.950 and 0.550 MPa Equivalent ratio to produce a stable knock were 0.4 ~ 5.2,0.5 ~ 4.7,0.5 ~ 3.9.