粒子云侵蚀问题实验研究中动能通量模拟的意义

本文首先将粒子云侵蚀条件下的驻点表面后退分解为无粒子烧蚀部分、粒子云引起的烧蚀增量部分和粒子撞击物面引起的直接侵蚀部分。然后研究了表面能量平衡关系,给出了粒子云引起的烧蚀增量表达式。最后分三类讨论粒子与飞行器的碰撞:(1)完全弹性碰撞(不符合实际);(2)完全非弹性碰撞;(3)部分弹性碰撞。对于后两种碰撞,本文分析了动能通量模拟适用的条件。

IMPLICATIONS OF SIMULATING THE PARTICLE KINETIC ENERGY FLUX IN PARTICLE EROSION TESTS

The total rate of erosion/ablation in particle environmentsis resolved into three parts: the ablation in clean air. the ablation augmentation due to presence of the particle environments and the direct mechanical erosion when the particles strike against the surface. The expression for ablation augmentation is obtained by writing the energy balance on the surfacs in erosion environments. Finally, three types of collision of the particles with the surface are discussed. (1) perfectly elastic collisions (unrealistic); (2) non-elastic collisions and (3) partially elastic collisions. The conditions under which the particle kinetic energy flux will be a suitable simulation criterion are discussed for the last two types.