可燃介质中飞行圆球诱导斜爆轰的流场结构

基于带化学反应的二维轴对称Euler方程,利用带有Superbee限制函数的波传播算法,对氢/氧/氮预混气中飞行圆球诱导斜爆轰进行了数值模拟。结果表明,在达姆科勒数Da略大于临界情形时,圆球诱导的驻定爆轰是一个由强过驱斜爆轰、弱过驱斜爆轰、反应激波和惰性激波组合而成的复合结构。波后的圆球绕流流场内存在2个亚音速区和1个超音速区。在圆球背风表面,还形成了第2道斜激波。

Flow pattern of oblique detonation induced bya hypervelocity ball in combustible gas

Based on the two-dimensional axisymmetric Euler equations coupling with chemical reactions,the phenomena of oblique detonation induced by a hypervelocity ball in hydrogen-oxygen-nitrogen mixture were numerically studied by using wave propagation algorithm with Superbee limiter.The results show that the standing detonation induced by a ball show the composite structure at Damkohler number condition slightly larger than the threshold,whose structure is composed of a strong overdriven oblique detonation,a weak overdriven oblique detonation,a reacting shock wave and a inert shock wave.There were two subsonic zone and a supersonic zone in the flow past a sphere after wave.The second oblique shock wave was formed in the leeward surface of the ball.