高超声速流场中CO2的红外辐射研究

文中针对高超声速绕流场中驻点线上的CO2气体展开了辐射光谱的相关研究，分析了CO2 对 整个高超声速目标的红外辐射产生的影响。研究了以球体作为飞行本体，通过计算流体力学的方法，描述高超声速流场中驻点线的物理状态以及CO2的含量变化。以此为基础，通过逐线法计算了不同 飞行条件下绕流场中驻点线上CO2的辐射光谱。估算了发生烧蚀现象时，CO2的辐射光谱。通过理论 计算，发现在典型的高超声速飞行状态下，无烧蚀的纯空气高超声速流场中驻点线上CO2 的红外辐 射远小于飞行器本体的红外辐射。而在有烧蚀的情况下，激波层中的CO2的红外辐射将不可忽略。

IR radiation of CO2 in hypersonic flow fields

The IR spectrum from CO2 in hypersonic flow fields along stagnation line was studied; the influence on total IR radiation from hypersonic target by CO2 was analyzed. Using CFD method, the physical conditions of near-space hypersonic flow fields along stagnation line were calculated for sphere target. According to the flow fields' calculation, the spectrum of CO2 in hypersonic flow fields in different flying conditions was calculated using Line-By-Line method. And the radiation from CO2 was also estimated for ablating condition. According to the theoretical calculation, the IR radiation from CO2 in hypersonic flow fields along stagnation line without ablation is far less than the IR radiations from solid craft self, but in ablating condition, CO2 in shock can not be ignored.