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为在组合动力中寻求一种可靠、高频的爆震起爆方法,对超声速环形向心射流产生的激波在抛物形凹面腔内形成激波会聚,并起爆爆震的过程进行了三维的数值模拟。分析了环形向心射流的发展、前导激波的碰撞、激波会聚起爆爆震波及爆震波传播过程的流场变化情况。研究发现:除了激波的强度和混合气的性质这两个关键影响因素以外,在一定条件下,几何条件对能否起爆爆震有非常重要的影响。前导激波的碰撞和激波会聚产生的压力升高要远高于温度升高。激波在凹面腔内会聚形成的高能区域能直接起爆过驱动爆震波,起爆后过驱动爆震波迅速衰退成CJ爆震波。爆震波平均波速为1929.8m/s,波后压力为1.5MPa,温度为3400K。
In order to find a reliable and high-frequency detonation method in combined power, three-dimensional numerical simulation of the shock converging in the parabolic concave cavity and the detonation process of the shock wave generated by the supersonic annular centripetal jet simulation. The development of annular centripetal jets, the collision of leading shockwaves, the detonation of shockwaves and the change of flow field during the propagation of detonation waves are analyzed. It is found that except for the two key influencing factors, such as the intensity of the shock wave and the nature of the gas mixture, the geometric conditions have a very important influence on the detonation initiation under certain conditions. The pressure rise caused by the collision and shock convergence of the leading shockwaves is much higher than the temperature rise. The high-energy region formed by the convergence of the shock wave in the concave cavity can directly launch the overdrive detonation wave, and the over-driven detonation wave rapidly degenerates into a CJ detonation wave after detonation. The average velocity of detonation wave is 1929.8m / s, wave pressure is 1.5MPa and temperature is 3400K.