物理化学模型对流场电磁散射特性的影响

doi:10.7527/S1000-6893.2022.27707

Abstract

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:

V211

Weifang CHEN, Jinghua SUN, Deyang TIAN, Yesi CHEN. Influence of physical and chemical models on electromagnetic scattering characteristics of flow field[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023, 44(12): 127707.

Figures/Tables 13

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高度H/km	马赫数Ma	攻角α/（°）	化学反应动力学模型	空气多组元模型
30	15	0	D&K/Gupta/Park	7
40	15	0	D&K/Gupta/Park	7
50	20	0/10	Gupta	7/11

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

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