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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。
In order to study the effect of jet entrance width on the detonation initiation of a toroidal shock, a numerical example was given to simulate the detonation process of ring shock focused detonation with different jet entrance widths by taking hydrogen and air mixture as an example. The results show that when the temperature of incident jet is a certain value, the entrance jets of annular jet with different widths correspond to the critical values of different incident pressure Pin. When Pin is larger than the critical value, the shock wave formed can form high temperature and high pressure Region, which detonates the detonation wave. As the width of the entrance spout increases, the incident intensity of the jet increases and the corresponding critical incident pressure increases.