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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2023, Vol. 44 ›› Issue (12): 127707-127707.doi: 10.7527/S1000-6893.2022.27707

• Fluid Mechanics and Flight Mechanics • Previous Articles    

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

Weifang CHEN1, Jinghua SUN2(), Deyang TIAN3, Yesi CHEN1   

  1. 1.School of Aeronautics and Astronautics,Zhejiang University,Hangzhou 310027,China
    2.Science and Technology on Space Physics Laboratory,China Academy of Launch Vehicle Technology,Beijing 100076,China
    3.Hypervelocity Aerodynamics Institute,China Aerodynamics Research and Development Center,Mianyang 621000,China
  • Received:2022-06-30 Revised:2022-07-27 Accepted:2022-08-22 Online:2022-09-14 Published:2022-09-13
  • Contact: Jinghua SUN E-mail:562778845@qq.com
  • Supported by:
    National Natural Science Foundation of China(U20B2007)

Abstract:

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.

Key words: electromagnetic scattering, plasma, finite-difference time-domain method, chemical reaction kinetics models, turbulence models, radar cross-section

CLC Number: