弯曲的激波与壁面进一步作用后发生反射，由于波前气流速度不同，这种反射存在规则反射和马赫反射两种类型；
The bent shock wave is reflected at the wall. As the flow speed changes, two kinds of shock reflection have been observed.
激波在自由面反射后，自由表面附近的粒子速度为活塞速度的二倍，这和宏观力学结果相同。
After reflection, the average particle velocity near free surface is equal to twice the piston velocity approximately, which agrees with macroscopic phenomena.
我们发现，在反射波到达爆炸点后，这里出现了一条密度为零的奇轨线和另一条左向的激波。
We find that there appears a singular trajectory ( density on it being zero ) and a additional left-facing shock after the reflected wave reaches the explosion point.
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