高速等离子体尾流结构的实验研究

通过测量流场等离子体电子密度分布的方法，测定了超高速流场中钝体后主激波的几何位置．采用非线性动力学中的 Ｋｏｌｍｏｇｏｒｏｖ 熵值的方法，得到熵的极小值位置与电子密度法得到的最大值位置是相同的．根据 Ｋｏｌｍｏｇｏｒｏｖ 熵值的分布得到了自由剪切层并观测到钝体底部近尾区存在有一个有序区域．实验数据分析结果表明 Ｋｏｌｍｏｇｏｒｏｖ 最小熵值法能够较清晰地刻划处于远尾区流场的结构

Experiment Investigation of High Speed Plasma Wake Structures

The position of the bow shock in the blunt cone wake has been determined by measuring the profile of plasma electron density. The position of minimum entropy, which was obtained by using the method of Kolmogorov entropy in the nonlinear dynamics, and the maximal position value obtained by the method of electron density corresponded to each other. The free cutting layer has been determined, and the ordered region behind the blunt body has been observed on the basis of the distribution of Kolmogorov entropy. The experimental results show that the method of minimum Kolmogorov entropy can clearly describe the structure of the far wake flow region.