物理化学模型对流场电磁散射特性的影响  

Influence of physical and chemical models on electromagnetic scattering characteristics of flow field

作　　者：陈伟芳[1] 孙精华 田得阳 陈烨斯 CHEN Weifang;SUN Jinghua;TIAN Deyang;CHEN Yesi(School of Aeronautics and Astronautics,Zhejiang University,Hangzhou 310027,China;Science and Technology on Space Physics Laboratory,China Academy of Launch Vehicle Technology,Beijing 100076,China;Hypervelocity Aerodynamics Institute,China Aerodynamics Research and Development Center,Mianyang 621000,China)

机构地区：[1]浙江大学航空航天学院,杭州310027 [2]中国运载火箭技术研究院空间物理重点实验室,北京100076 [3]中国空气动力研究与发展中心超高速空气动力研究所,绵阳621000

出　　处：《航空学报》2023年第12期58-67,共10页Acta Aeronautica et Astronautica Sinica

基　　金：国家自然科学基金(U20B2007,6162790014,12002306)。

摘　　要：基于由不同化学反应动力学模型和湍流模型计算得到的高超声速等离子体流场数据,采用三维时变等离子体分段线性电流密度递归卷积时域有限差分(PLJERC-FDTD)方法探索了电磁波与典型高超声速飞行器等离子体流场的相互作用规律,对比分析了不同化学反应动力学模型、不同湍流模型及不同电磁波频率等情况下高超声速飞行器等离子体流场电磁散射特性。对于不同的化学反应动力学模型,Park模型和Gupta模型计算得到的等离子体流场的后向雷达散射截面积(RCS)较为接近,且均小于D&K模型计算得到的,而考虑湍流效应的电磁散射特性比层流流场更为复杂,其后向RCS随频率变化更加剧烈,且随着高度增加,湍流效应对电磁散射特性的影响逐渐减弱。Based on the hypersonic plasma flow field data calculated by different chemical reaction kinetics models and turbulence models,a 3D time-varying Piecewise Linear JE Recursive Convolution Finite-Difference Time-Domain(PLJERC-FDTD)method is applied to explore the interaction between electromagnetic wave and plasma flow field of a typical hypersonic vehicle.The electromagnetic scattering characteristics of hypersonic vehicle plasma flow field under different chemical reaction dynamics models,different turbulence models and different electromagnetic wave frequencies were compared and analyzed.For different chemical reaction dynamic models,the backward Radar Cross-Section(RCS)of plasma flow field calculated by Park model and Gupta model are close to each other,and are both smaller than the backward RCS of plasma flow field calculated by D&K model.The electromagnetic scattering characteristics considering turbulence effects are more complex than those of laminar flow field.The backward RCS fluctuates more sharply along with frequency varying,and the influence of turbulence effect on electromagnetic scattering gradually decreases with the increase of altitude.

关 键 词：电磁散射 等离子体 时域有限差分方法 化学反应动力学模型 湍流模型 雷达散射截面 

分 类 号：V211[航空宇航科学与技术—航空宇航推进理论与工程]