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对以激波聚焦和增加障碍物方式诱导煤油-空气气液两相爆震燃烧的过程进行了数值模拟.采用欧拉-拉格朗日方法建立了脉冲爆震发动机(PDE)中气液两相流的喷射、雾化、掺混过程.研究发现环形爆震波在爆震管凹腔内经过反射、汇聚后能够引燃可燃混合物.而在障碍物处,激波的反射和再反射聚焦能够形成高温高压点(2700K,25MPa),产生局部爆炸,有助于形成稳定的脉冲爆震燃烧(波面速度为1900m/s,温度为2 950K),有效地缩短由缓燃向爆震转变(DDT)距离至0.45m.
The process of kerosene-air gas-liquid two-phase detonation combustion induced by shock wave focusing and adding obstacle is numerically simulated. The gas-liquid two-phase flow in pulse detonation engine (PDE) is established by Euler-Lagrange method Phase injection, atomization and blending process.It is found that the ring-shaped detonation wave can reflect the combustible mixture in the detonation tube cavity and can ignite the combustible mixture.At the obstacle, the reflection and refocusing of the shock wave can The formation of high temperature and high pressure point (2700K, 25MPa), the local explosion, contribute to the formation of a stable pulse detonation combustion (wave speed of 1900m / s, temperature of 950C), effectively reducing the transition from slow burn to knock ) To 0.45m.