超高速碰撞喷出物气化与等离子体形成的物理机制

Physical mechanism of ejecta vaporization and plasma formation in hypervelocity impact

为了了解超高速碰撞产生等离子体的物理机制,采用理论方法对超高速碰撞LY12铝靶各物理过程的能量分配进行了分析,涉及到熔化相变、气化相变及等离子体形成过程的能量消耗。揭示了碰撞喷出物形成过程中各物理阶段对气化、等离子体形成的影响因素,包括碰撞的附加热机制、材料碰撞后等离子体羽的形成及等离子体羽膨胀的物理机制,并给出了模型描述。

In order to obtain physical mechanism of plasma generated by hypervelocity impact,the energy distribution of hypervelocity impact of an LY12 aluminum projectile into an LY12 aluminum target was analyzed in all the physical processes,related to energy consumption of melting phase transition,vapor phase transition and plasma formation.Factors influencing vaporization and plasma formation were disclosed in every physical stages during the formation of impact ejecta.In addition,additional heating mechanism and physical mechamism of formation and expansion of plasma plume were included after impacting.The model description of every physical process was also given.