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

被引：0
|
作者：
Chen W. [1 ]
Sun J. [2 ]
Tian D. [3 ]
Chen Y. [1 ]
机构：
[1] School of Aeronautics and Astronautics, Zhejiang University, Hangzhou
[2] Science and Technology on Space Physics Laboratory, China Academy of Launch Vehicle Technology, Beijing
[3] Hypervelocity Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang
来源：
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | 2023年 / 44卷 / 12期
基金：
中国国家自然科学基金;
关键词：
chemical reaction kinetics models; electromagnetic scattering; finite-difference time-domain method; plasma; radar cross-section; turbulence models;
D O I：
10.7527/S1000-6893.2022.27707
中图分类号：
学科分类号：
摘要：
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 de⁃ creases with the increase of altitude. © 2023 AAAS Press of Chinese Society of Aeronautics and Astronautics. All rights reserved.
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