环形射流初始压力对激波聚焦起爆的影响分析
Investigation on the influence of jet pressure on detonation initiation via imploding annular shock waves
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摘要: 为了研究射流入射压力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,对不同射流入射压力下环形激波聚焦爆震起爆过程进行了数值模拟,结果表明,当环形射流入射强度足够大时,其形成的激波聚焦能够形成高温、高压区域,从而直接起爆爆震波;爆震管推力壁对激波具有反射加强作用,有助于爆震波的形成;环形射流入射压力存在一个临界值,低于此值时,则不能起爆爆震波.Abstract: In order to investigate the influence of jet pressure on detonation initiation via imploding annular shock waves,detonation initiation with different jet pressures was simulated with hydrogen-air mixture.The results indicate that,when jet pressure is high enough,imploding annular shock waves can form high pressure and high temperature region that lead to direct initiation;thrust wall can strengthen reverberation shock,which contributes to initiate detonation;when the jet pressure is lower than its critical value,detonation can not be initiated.
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