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<p>Given the increasing use of stealth technologies by aircraft, the defensive capabilities of most current radars are significantly limited. This paper focuses on modeling the gas radiation phenomena surrounding near-space vehicles to address this issue and provide an optimal detection wavelength range for aircraft. The primary concern is the gas radiation characteristics at altitudes of 20&#xa0;km or higher and Mach numbers of 10 or greater. Accordingly, this study establishes an integrated framework for analyzing gas radiation characteristics under near-space operating conditions (altitude ≥ 20&#xa0;km, Mach number ≥ 10), combining computational fluid dynamics with quantum radiation physics to elucidate ultraviolet spectral signatures of hypersonic vehicles. The radiation field was computed using a three-temperature model with hybrid line-broadening and line-by-line calculation methods. Furthermore, a multiscale simulation approach integrating the direct simulation Monte Carlo (DSMC) particle method with quantum kinetic modeling was employed to investigate single-point radiation characteristics in a hypersonic flow field at <i>H</i> = 70&#xa0;km and Ma = 20. Based on these simulations, the following conclusions are drawn: In equilibrium, the spectral radiation intensity in the ultraviolet band increases with temperature. In non-equilibrium, the ultraviolet spectral radiation intensity gradually decreases as <i>T</i><sub>v</sub> and <i>T</i><sub>e</sub> decrease. Besides temperature, the ultraviolet radiation intensity is also closely related to molecular number density, particularly that of NO and O<sub>2</sub>.</p>

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Modeling and Study of UV Radiation Characteristics in the Surrounding Environment of Hypersonic Vehicles

  • 期刊论文

  • 发表日期：

    2025年12月6日

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  • Xiaoyi Sun,
  • Yu Wang,
  • Senyun Liu

摘要

Given the increasing use of stealth technologies by aircraft, the defensive capabilities of most current radars are significantly limited. This paper focuses on modeling the gas radiation phenomena surrounding near-space vehicles to address this issue and provide an optimal detection wavelength range for aircraft. The primary concern is the gas radiation characteristics at altitudes of 20 km or higher and Mach numbers of 10 or greater. Accordingly, this study establishes an integrated framework for analyzing gas radiation characteristics under near-space operating conditions (altitude ≥ 20 km, Mach number ≥ 10), combining computational fluid dynamics with quantum radiation physics to elucidate ultraviolet spectral signatures of hypersonic vehicles. The radiation field was computed using a three-temperature model with hybrid line-broadening and line-by-line calculation methods. Furthermore, a multiscale simulation approach integrating the direct simulation Monte Carlo (DSMC) particle method with quantum kinetic modeling was employed to investigate single-point radiation characteristics in a hypersonic flow field at H = 70 km and Ma = 20. Based on these simulations, the following conclusions are drawn: In equilibrium, the spectral radiation intensity in the ultraviolet band increases with temperature. In non-equilibrium, the ultraviolet spectral radiation intensity gradually decreases as Tv and Te decrease. Besides temperature, the ultraviolet radiation intensity is also closely related to molecular number density, particularly that of NO and O2.