We propose a radiation model for a coupled gas-solid two-phase flow that includes ablation particles. This model is designed to compute the UV radiation characteristics of a plume containing ablation particles, employing the SHDOM method. The model considers the distribution characteristics of the ablation particles. Subsequently, we calculates the scattering phase function of these particles, along with a cumulative probability distribution, using the principles of Mie theory. The impact of ablation particle presence or absence on plume radiation characteristics is assessed, and the influence of ablation particle phase transition on plume radiation characteristics is also examined. The results suggest that adding ablation particles significantly boosts the UV radiation emitted by the plume, resulting in an average increase in radiance of approximately 65 % after the ablation process. In addition, the effects of changes in the phase state of the particles were studied in detail, with changes in particle phase increasing the average radiance within the plume by about 43 %. The results of this research have potential to advance aircraft stealth capabilities, characterize operating conditions of combustion chambers and aid in studying thermal protection materials.

中文翻译：

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烧蚀颗粒对废气羽流紫外辐射特性的影响

我们提出了一种包含烧蚀粒子的耦合气固两相流的辐射模型。该模型旨在采用 SHDOM 方法计算包含烧蚀粒子的羽流的紫外线辐射特性。该模型考虑了烧蚀粒子的分布特征。随后，我们使用米氏理论的原理计算这些粒子的散射相函数以及累积概率分布。评估了烧蚀粒子存在或不存在对羽流辐射特性的影响，并且还检查了烧蚀粒子相变对羽流辐射特性的影响。结果表明，添加烧蚀颗粒可显着增强羽流发出的紫外线辐射，导致烧蚀过程后辐射亮度平均增加约 65%。此外，还详细研究了颗粒相态变化的影响，颗粒相态的变化使羽流内的平均辐射率增加了约 43%。这项研究的结果有可能提高飞机的隐身能力、表征燃烧室的工作条件并有助于研究热防护材料。