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arXiv 2203.04742physics.plasm-ph
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增强一维粒子模拟以自洽地求解霍尔推力器中不稳定性引起的电子输运

Enhancing one-dimensional particle-in-cell simulations to self-consistently resolve instability-induced electron transport in Hall thrusters

Farbod Faraji, Maryam Reza, Aaron Knoll

摘要:

高功率霍尔推进器的出现和对它们作为各种任务的主要推进系统的使用的日益增加的兴趣,为旨在对这种推进器技术进行自洽预测建模的努力提供了新的推动力。在这篇文章中,我们提出了一种新的方法,它允许提高预测能力的一维粒子在细胞(PIC)模拟自洽捕获波诱导电子输运由于霍尔推力器的方位角不稳定性。从这种方法产生的所谓的“伪2D”PIC方案在几种操作条件下进行了广泛的测试。结果进行了比较,对一个行之有效的2D3V轴向方位角参考情况下的轴向剖面的时间平均等离子体的属性,方位角电场波动和它们的色散特性,和在电子的方位角动量方程中的力项的贡献的交叉场迁移率。我们已经证明,伪二维PIC提供了上述方面的预测,几乎在所有条件下与全二维模拟的预测非常接近。此外,与我们的方法相关联的数值参数的伪二维模拟结果的敏感性进行了详细评估。这些分析的结果为进一步改进这一方法的下一步行动提供了线索。

英文摘要:

The advent of high-power Hall thrusters and the increasing interest towards their use as a primary propulsion system for various missions have given a new boost to the efforts aiming at self-consistent predictive modeling of this thruster technology. In this article, we present a novel approach, which allows enhancing the predictive capability of one-dimensional Particle-in-Cell (PIC) simulations to self-consistently capture the wave-induced electron transport due to the azimuthal instabilities in Hall thrusters. The so-called "pseudo-2D" PIC scheme resulting from this approach is extensively tested in several operating conditions. The results are compared against a well-established 2D3V axial-azimuthal reference case in terms of the axial profiles of the time-averaged plasma properties, the azimuthal electric field fluctuations and their dispersion features, and the contributions of the force terms in the electron azimuthal momentum equation to the cross-field mobility. We have demonstrated that the pseudo-2D PIC provides a prediction of the above aspects that compares very closely in almost all conditions with those from the full-2D simulation. In addition, the sensitivity of the pseudo-2D simulation results to the numerical parameters associated with our approach is assessed in detail. The outcomes of these analyses have casted light on the next steps to further improve the approach.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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