Ultraviolet radiation characteristics of NO in shock layer of hypersonic vehicle

Jie Wang, L. Bai, Tianjiao Zhang, Q. Lv, Chaofan Xue
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Abstract

The ultraviolet radiation generated by NO transition in the shock layer of hypersonic vehicle provides an important basis for target detection and recognition. In this paper, direct simulation Monte Carlo (DSMC) method is used to simulate the high temperature flow field of the Apollo aircraft. Based on the temperature, pressure, and mass fraction, SPECAIR software is used to calculate the NO(γ) spectral absorption coefficient, and combined with the line of sight (LOS) method, the ultraviolet radiation produced by the NO(γ) transition along the stagnation line at different heights is calculated. Based on the wall heat flux, the wall energy conservation equation is used to calculate the wall temperature, combined with the Planck's law to calculate the wall radiation, and the influence of the wall catalytic effect on the ultraviolet radiation is studied. The results show that with the increase of the height, the gas pressure and temperature decrease obviously, and the ultraviolet radiation from NO(γ) transition decreases. The wall heat flux calculated by the wall catalytic model is very different. The choice of the wall catalytic model is particularly important when studying the influence of the wall radiation on the ultraviolet radiation.
高超声速飞行器激波层NO的紫外辐射特性
高超声速飞行器激波层中NO跃迁产生的紫外线辐射为目标探测和识别提供了重要依据。本文采用直接模拟蒙特卡罗(DSMC)方法对阿波罗飞行器的高温流场进行了模拟。基于温度、压力和质量分数,利用SPECAIR软件计算NO(γ)光谱吸收系数,并结合视线(LOS)法,计算不同高度NO(γ)沿滞止线跃迁产生的紫外辐射。基于壁面热流密度,利用壁面能量守恒方程计算壁面温度,结合普朗克定律计算壁面辐射,研究了壁面催化效应对紫外辐射的影响。结果表明:随着高度的增加,气体压力和温度明显降低,NO(γ)跃迁产生的紫外辐射减弱;用壁面催化模型计算的壁面热流密度有很大差异。在研究壁面辐射对紫外辐射的影响时,壁面催化模型的选择尤为重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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