The molecular and liquid droplet thruster-induced contamination is studied numerically for a 130 N ISS bipropellant thruster using Navier-Stokes and DSMC flow solvers and a Lagrangian particle tracking. The molecular sources contributing to the inorganic components of the plume backflow contaminant are estimated, and a qualitative characterization of the liquid droplet contribution to the organic part of contaminant is conducted. The total calculated mass flux of the molecular contaminant in the backflow region compares very well with the experimental measurement on-board of Mir space station. The computations show that approximately 20 to 30 per cent of the droplets formed at the break up of the unburned propellant film at the exit can contribute to the organic part of the backflow contaminant.
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机译:使用Navier-Stokes和DSMC流动求解器以及拉格朗日粒子跟踪技术,对130 N ISS双推进剂推进器的分子和液滴推进器引起的污染进行了数值研究。估计导致羽流回流污染物的无机成分的分子源,并对液滴对污染物的有机部分的贡献进行定性表征。回流区域中分子污染物的总计算质量通量与Mir空间站的机载实验测量结果相比非常好。计算表明,在出口处未燃烧的推进剂薄膜破裂时形成的液滴中约有20%至30%会造成回流污染物的有机部分。
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