射流宽度对激波会聚起爆的影响分析

摘要

In order to investigate the influence of jets width on detonation initiation via imploding annular shock waves, detonation initiation with different jets width were simulated and hydrogen-air mixture was used. The results indicate that when jets temperature is constant, different jets width exist different critical jets pressure, when jets pressure Pin is higher than the critical jets pressure, imploding annular shock waves can form high pressure and high temperature region that lead to direct initiation; the critical jets pressure increased with the increase of jet width.%为了研究射流入射喷口宽度对环形激波聚焦爆震起爆的影响,以氢气和空气混合物为例,对不同射流入射喷口宽度的环形激波聚焦爆震起爆过程进行了数值模拟.结果表明,当入射射流的温度为一定值时,不同宽度的环形射流入射喷口对应着不同入射压力Pin的临界值,当Pin大于该临界值时,其形成的激波聚焦才能够形成高温、高压区域,从而起爆爆震波；随着入射喷口宽度的增加,射流的入射强度增大,其对应的临界入射压力随之增大.