一项关于氩气作为静电网格离子推力器推进剂的全球模型的等离子体化学研究

English | 2024 | ISBN: B0DBPZXXK1 | Pages: 147 | EPUB | 4.85 MB

Electric propulsion optimizes propellant mass and meets new propulsion device demands. These devices adjust satellite orbits and enable long missions. Among various thrusters, electrostatic ones have well-defined physics, simplifying operational parameter optimization. This study developed a global model for an Inductively Coupled Plasma (ICP) cylindrical ion thruster with an output polarized grid system. Argon propellant is injected into the chamber, and ICP plasma is generated by a radiofrequency current. Neutral and excited species are accelerated out by diffusion, while ionized species are accelerated via the polarized grids' electric field. The polarized grid system was optimized for better plasma sheath use. The model considers single and multi-step ionization, the Electron Energy Distribution Function (EEDF), neutral gas, and electron power balance equations. Excited species influence ionization energy, but not ionic density. However, the ion substitution rate increases, essential for thrust and specific impulse. The model determines the neutral gas temperature by considering the power balance and interactions with other species.

电推进优化了推进剂质量，满足了新的推进装置需求。这些装置调整卫星轨道，并支持长时间任务。在各种喷气发动机中，静电式喷气发动机的物理特性明确，简化了操作参数的优化过程。本研究开发了一个用于固态感应耦合等离子体（ICP）圆柱型离子喷气发动机的全球模型，该发动机具有输出极化网格系统。氩作为推进剂被注入腔室中，并通过射频电流产生ICP等离子体。中性及激发态物种是通过扩散加速出来的，而离子化物种则是通过极化电场加速出来的。优化了极化电场系统以更好地利用等离子鞘层。该模型考虑了单步和多步的离子化过程、电子能量分布函数（EEDF）、中性气体以及电子功率平衡方程。激发态物种影响离子化的能量，但不影响离子密度。然而，离子替代率增加是必要的，这对于推力和特定冲量来说都是关键的。该模型通过考虑功率平衡与与其他物种的相互作用来确定中性气体的温度。

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