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Full Length Article | Open Access

Difference analysis in terahertz wave propagation in thermochemical nonequilibrium plasma sheath under different hypersonic vehicle shapes

Wenchong OUYANGa,b, Qi LIUa,b, Zhengwei WUa,b,c( )
School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, China
Joint Laboratory of Plasma Application Technology, Institute of Advanced Technology, University of Science and Technology of China, Hefei 230031, China
CAS Key Laboratory of Geospace Environment, University of Science and Technology of China, Hefei 230026, China
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Abstract

Research on terahertz communication under different vehicles has important guiding significance for the design of future hypersonic vehicle and Radio Frequency (RF) blackout. In this paper, a joint simulation model of plasma flow under thermochemical nonequilibrium state and terahertz transmission is developed to investigate the differences in terahertz wave transmission characteristics under different vehicle shapes and the related mechanisms. By comparing the plasma sheath characteristics and terahertz transmission among HIFIRE-5b (Hypersonic International Flight Research Experimentation-5b), RAM C(Radio Attenuation Measurement C) and ARD (Atmospheric Reentry Demonstrator) vehicles, it is found that the sheath thickness and electron density of ARD vehicles is significantly larger than that of HIFIRE-5b and RAM C vehicles, resulting in greater terahertz wave attenuation. Collision absorption plays a major role in the terahertz attenuation of vehicles, and the contribution of reflection effects is only observed in the ARD vehicle due to its larger plasma sheath thickness and spatial structure variation. Based on the above comparison results, a shape design scheme of reducing the vehicle head and tail for mitigating RF blackout is proposed, and the scheme is proved by further analyzing the effects of different vehicle heads and tails on the terahertz communication. With the decrease of the head radius and tail width of hypersonic vehicle, the wave attenuation at the same terahertz frequency decreases, and the contribution of reflection effect to wave attenuation gradually disappears. Therefore, the shape design scheme of reducing the vehicle head and tail can effectively alleviate the RF blackout problem, which provides an important reference value for future hypersonic vehicle design.

Keywords

Hypersonic vehiclesWave propagationPlasma flowPlasma sheathsShape optimizationTerahertz waves

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Chinese Journal of Aeronautics
Volume 36 Issue 10,
October 2023
Pages 137-151
DOI: 10.1016/j.cja.2023.07.001
Cite this article:
OUYANG W, LIU Q, WU Z. Difference analysis in terahertz wave propagation in thermochemical nonequilibrium plasma sheath under different hypersonic vehicle shapes. Chinese Journal of Aeronautics, 2023, 36(10): 137-151. https://doi.org/10.1016/j.cja.2023.07.001

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Received: 28 September 2022
Revised: 20 October 2022
Accepted: 02 November 2022
Published: 10 July 2023
© 2023 Chinese Society of Aeronautics and Astronautics.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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