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首页> 外文期刊>Journal of Thermophysics and Heat Transfer >Modeling of Ultraviolet Radiation in Steady and Transient High-Altitude Plume Flows
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Modeling of Ultraviolet Radiation in Steady and Transient High-Altitude Plume Flows

机译：稳态和瞬态高空羽流中的紫外线辐射建模

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摘要

Ultraviolet radiation from hydrazine spacecraft thruster plumes interacting with ambient atomic oxygen is modeled for low-Earth-orbit conditions. Two numerical techniques that employ the direct simulation Monte Carlo method are applied for the first time to the modeling of space plume radiation transient and three-dimensional flows. These efficient procedures allow one to analyze the effect of atomic oxygen penetration of the thruster plume, which is a key factor in modeling rarefied space plume radiation. The overlay technique is used to model the transient flow evolution during the first several seconds after motor ignition. Good agreement between modeling and experiment are obtained before 1-s motor burn time. The sensitivity of the plume radiation to the molecular total collision model is analyzed using the overlay technique, and the radiation spatial distribution was found to be strongly dependent on the temperature exponent of the coefficient of viscosity. Three-dimensional computations are conducted for different angles between the plume axis and the freestream directions, and the radiation maps for OH(A) and NH(A) are presented. Significant difference between OH(A) and NH(A) radiation fields as a function of the angle of attack is shown.
机译：在低地球轨道条件下，模拟了来自肼航天器推进器羽流与周围原子氧相互作用的紫外线辐射。首次将采用直接模拟蒙特卡洛方法的两种数值技术应用于空间羽流辐射瞬态和三维流的建模。这些有效的过程使人们能够分析推进器羽流中原子氧的渗透效果，这是对稀疏空间羽流辐射进行建模的关键因素。覆盖技术用于在电机点火后的最初几秒钟内对瞬态流动的演变进行建模。在1-s电动机燃烧时间之前获得了建模与实验之间的良好一致性。使用覆盖技术分析了羽状辐射对分子总碰撞模型的敏感性，发现辐射的空间分布强烈依赖于粘度系数的温度指数。针对羽流轴与自由流方向之间的不同角度进行了三维计算，并给出了OH（A）和NH（A）的辐射图。显示了OH（A）和NH（A）辐射场之间的显着差异作为迎角的函数。

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