旋转间断过渡层中的粒子轨道

用一维粒子Code研究了旋转间断过渡层中的粒子轨道。发现绝大多数粒子都能穿过过渡层到达下游区;但是,有少量的粒子被捕获在过渡层内;也有一定数量的粒子被反射回上游区。捕获粒子数和反射粒子数与过渡层厚度D有关。在稳定旋转间断中,反射粒子数和捕获粒子数分别为2％和3％左右。对于不稳定的旋转间断,这两个比值可上升2-4倍。反射粒子和捕获粒子的动力学效应可以很好地解释旋转间断,中间激波和多重激波模拟的一些重要结果.

PARTICLE TRAJECTORY IN THE TRANSITION REGION OF ROTATIONAL DISCONTINUITY

A one-dimensional particle code is used to study particle trajectories in the transition region of rotational discontinuities.It is found that most particles can cross the transition region to go into the downstream.But a few particles are trapped in the transition region and some particles return to the upstream by reflection.The number of the trapped and reflex particles depends on the width of the transition region.In a stable rotational discontinuity,the reflex and trapped particles are respectively 2% and 3%.In the case of an unstable rotational discontinuity,these ratios would rise by a factor of 2-4.Kinetic effect of the reflex and trapped particles may explain some important results for the rotational discontinuity,intermediate shocks and mutiple shocks