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首页> 外文期刊>Physics of plasmas >Numerical studies of wall-plasma interactions and ionization phenomena in an ablative pulsed plasma thruster
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Numerical studies of wall-plasma interactions and ionization phenomena in an ablative pulsed plasma thruster

机译：烧蚀脉冲等离子体推进器中壁-等离子体相互作用和电离现象的数值研究

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摘要

Wall-plasma interactions excited by ablation controlled arcs are very critical physical processes in pulsed plasma thrusters (PPTs). Their effects on the ionization processes of ablated vapor into discharge plasma directly determine PPT performances. To reveal the physics governing the ionization phenomena in PPT discharge, a modified model taking into account the pyrolysis effect of heated polytetrafluoroethylene propellant on the wall-plasma interactions was developed. The feasibility of the modified model was analyzed by creating a one-dimensional simulation of a rectangular ablative PPT. The wall-plasma interaction results based on this modified model were found to be more realistic than for the unmodified model; this reflects the dynamic changes of the inflow parameters during discharge in our model. Furthermore, the temporal and spatial variations of the different plasma species in the discharge chamber were numerically studied. The numerical studies showed that polytetrafluoroethylene plasma was mainly composed of monovalent ions; carbon and fluorine ions were concentrated in the upstream and downstream discharge chamber, respectively. The results based on this modified model were in good agreement with the experimental formation times of the various plasma species. A large number of short-lived and highly ionized carbon and fluorine species (divalent and trivalent ions) were created during initial discharge. These highly ionized species reached their peak density earlier than the singly ionized species. Published by AIP Publishing.
机译：烧蚀控制电弧激发的壁-等离子体相互作用是脉冲等离子体推进器（PPT）中非常关键的物理过程。它们对被烧蚀的蒸气离子化成放电等离子体的过程的影响直接决定了PPT的性能。为了揭示控制PPT放电中电离现象的物理学原理，开发了一种修正模型，该模型考虑了加热的聚四氟乙烯推进剂对壁-等离子体相互作用的热解作用。通过创建矩形烧蚀PPT的一维模拟来分析修改后的模型的可行性。发现基于这种改进模型的壁-血浆相互作用结果比未改进模型更现实。这反映了我们模型中排放期间流入参数的动态变化。此外，对放电室内不同等离子体种类的时间和空间变化进行了数值研究。数值研究表明，聚四氟乙烯等离子体主要由单价离子组成。碳和氟离子分别集中在上游和下游放电室中。基于该修改模型的结果与各种血浆物种的实验形成时间非常吻合。在初始放电过程中，产生了大量短寿命且高度离子化的碳和氟（二价和三价离子）。这些高度离子化的物质比单个离子化的物质更早达到其峰值密度。由AIP Publishing发布。

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