Abstract: In order to investigate the influence of jets spout location on detonation initiation via imploding annular shock waves, detonation initiation with different jets spout locations were simulated and hydrogen-air mixture was used. The results indicate that jets spout locations were far away from hemisphere reflector wall. The critical jets pressure of direct initiation and wall reflection initiation is increased. The time of focus is late. The position of focus is farther from hemisphere reflector wall.

Key words: Detonation initiation; Detonation wave; Shock waves focus

摘要： 为了研究环形射流喷口位置对激波聚焦起爆爆震的影响,以氢气和空气混合物为例,对不同环形射流喷口位置条件下的激波聚焦起爆过程进行了数值模拟。结果表明,随着喷口距凹壁面距离L增大,直接聚焦起爆和凹壁面反射起爆所需的临界入射压力逐渐增大,相应的聚焦时刻会滞后,形成焦点的位置距凹壁面越远。

关键词: 爆震起爆;爆震波;激波聚焦