再入飞行器目标特性建模研究

再入目标的光辐射和电磁散射特性有重要应用,例如目标的探测、识别和指示技术.飞行器高超声速再入过程中,由于与周围大气强烈相互作用,不仅形成复杂结构再入流场,飞行器表面和流场中还伴随发生复杂化学物理过程,对目标特性产生严重影响.在对再入流场及伴随发生的化学物理过程研究分析的基础上, 建立再入目标特性理论模型框架,建立再入飞行器目标特性的基本计算方法,编制了相应计算程序,对典型再入飞行器的红外辐射和电磁散射特性进行了数值模拟.与相应实验结果的比较表明,流场电子数密度、高温气体辐射、等离子体尾迹的RCS等与实验结果一致.

Study on modeling of re-entry vehicle signatures

The radiation and electromagnetic wave scatter characteristics of reentry vehicle is important for a number of applications,i.e.detection,discrimination and designation of reentry targets.During hypersonic reentry the flowfield around the vehicle and its wake have very complicated flow structure accompanied by complicated chemic-physical processes,which significantly affect vehicle signatures.This paper describes the modeling of re-entry vehicle signatures upon the analysis of reentry flow-field accompanied by complicated chemical-physical phenomena.The basic computation method of re-entry vehicle signatures are presented,and the infrared radiation and electromagnetic wave scatter characteristics of a typical reentry body are simulated.The comparisons between theoretical calculation and experimental results also are presented.The calculation results of the electron number density,infrared radiation of high temperature gas of the flow-filed and RCS of plasma wake are qualitatively consistent with the experimental results.