再入弹头非平衡尾迹的回波特性分析

本文利用文1]方法计算了纯空气非平衡再入弹头尾迹流场,分析了尾迹等离子体场对雷达波的频响效应,并进一步估算了几种高程条件下的雷达散射截面,说明影响截面大小和分布的几个重要因素。分析和计算表明,以物体底部直径和环境参数表征的雷诺数达到转捩值以后,在完全湍流尾迹中可能出现散射截面的突增现象。

THE ECHO BEHAVIOR ANALYSIS OF THE NONEQUILIBRIUM WAKE

In the present article the air nonequilibrium wake flow field of reentry vehicle is calculated by means of a method given by present author in ref. 1]. The influence of plasma wake on radar wave frequency is analysed. The RCS in three cases with different altitudes are also estimated. Some important factors which effect on values and distributions of RCS have be shown. The present work results show that in a full development turbulent wake the rapid rise in RCS appears provided that environment Reynolds number, which is defined by the base diameter of the vehicle and environment parameters, exceeds a transitional Reynolds number.