球形重质气体物理爆炸特性

Physical characteristics of circular heavy gas cloud explosion

基于大涡模拟方法,结合高阶混合格式,对高压重质的SF6球形气云在空气中爆炸进行了模拟。数值模拟表明,爆炸产生的激波经过气体分界面时分为透射激波以及反射稀疏波,透射激波导致气体分界面处Richtmyer-Meshkov失稳增强,从而加速了2种气体的混合,而反射的稀疏波经过汇聚,在球心处形成二次激波,在该强激波作用下,流场区域基本呈现湍流形态。

The explosion of the high pressure,dense gas（SF6）in a circular shape was explored with the use of large eddy simulation（LES）,the hybrid high-order schemes were employed to solve the LES equations.The simulated results show that while the shock wave exploding from SF6 gas to air,the incident shock bifurcates into the transmitted shock and the reflected rarefaction wave.The Richtmyer-Meshkov instabilities occur as the transmitted shock accelerates the gas interface,the rarefaction wave moves inward first and converges at the origin,this will generate a strong circular reflected shock which makes the flow field become fully turbulent.