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首页> 外文会议>International Conference on Automation, Mechanical Control and Computational Engineering >Study on Chemical Reactions of Ions and Neutral Particles on the Wall with DSMC Method
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Study on Chemical Reactions of Ions and Neutral Particles on the Wall with DSMC Method

机译：具有DSMC方法壁离子和中性粒子的化学反应研究

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Plasma plumes exist widely in the electric propulsion systems. Neutral particles, ions, and metal particles are included in the flow field. Complex collisions occur between the particles. Particles will collide with the wall surface when they move towards the wall, then some particles will reflect back, the others will react on the wall with a certain probability. Chemical reactions on the wall have a significant effect on the distribution of the particles and lead to the change of density in the flow field. The chemical reaction models on the wall are studied based on the direct simulation of Monte Carlo method (DSMC). Five types of particles including molecular hydrogen H_2, atomic hydrogen H, atomic Titanium Ti, ion H_2~+, and ion H~+ are studied in the flow field, there are chemical reactions for these particles with a certain probability on the wall. The numerical simulation results show that the number density of molecular hydrogen H_2 increases obviously, the number density of atomic hydrogen H increases slightly, and the number density of ion H~+ decreases significantly after adding the chemical reaction models on the wall, indicating that the chemical reactions on the wall have a significant influence on the distribution of the particles in the flow field. The study in this paper provides basic data for further research on plasma plumes by the numerical simulation.
机译：等离子体羽毛在电动推进系统中广泛存在。中性颗粒，离子和金属颗粒包括在流场中。在粒子之间发生复杂的碰撞。当它们向壁移动时，颗粒将与壁表面碰撞，然后一些颗粒将反射回，其他颗粒将在墙壁上具有一定概率。墙壁上的化学反应对颗粒的分布产生显着影响，并导致流场中的密度变化。基于蒙特卡罗方法（DSMC）的直接仿真研究了壁上的化学反应模型。在流场中研究了五种类型的颗粒，包括分子氢H_2，原子氢H，原子钛Ti，离子H_2〜+和离子H〜+，这些颗粒在壁上具有一定概率的化学反应。数值模拟结果表明，分子氢气H_2的数量密度显而易见，原子氢H的数量密度略微增加，并且在墙壁上加入化学反应模型后，离子H〜+的数量密度显着降低，表明墙壁上的化学反应对流场中颗粒的分布产生了显着影响。本文的研究提供了基本数据，用于通过数值模拟进一步研究等离子体羽毛。

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