On the limitations of hybrid particle-in-cell for ion thruster plume simulations

doi:10.1063/1.5111791

CORC > 力学研究所 > 中国科学院力学研究所 > 高温气体动力学国家重点实验室

	On the limitations of hybrid particle-in-cell for ion thruster plume simulations
	Wang J 2; Hu Y(胡远)1,2
刊名	PHYSICS OF PLASMAS
	2019-10-01
卷号	26 期号:10 页码:8
ISSN号	1070-664X
DOI	10.1063/1.5111791
通讯作者	Wang, Joseph(josephjw@usc.edu)
英文摘要	A commonly used approach to simulate ion thruster plumes is a hybrid particle-in-cell (PIC) with the Boltzmann relation to model electrons. The limitations of such an approach are investigated by benchmarking hybrid PIC against fully kinetic PIC simulations using the real Xethorn to electron mass ratio (m(i)/m(e) = 241073). The results show that both full PIC and hybrid PIC lead to similar plume density structures but very different plume potentials. If one could ignore the ion beam neutralization region near the thruster exit, the main physics missing from a hybrid PIC plume model is that from the anisotropic electron characteristics. Including the beam neutralization region leads to further changes in electron temperature and plume potential. Compared to full PIC simulations, the hybrid PIC model results in an overestimation of the plume potential by about 30%-40% in the transverse direction for the simulations considered. Since the electrons in the plume are nonequilibrium and anisotropic, simply replacing the Boltzmann relation with the more general polytropic thermodynamic relation for electrons in a hybrid PIC plume model will not lead to a significant improvement in accuracy. Published under license by AIP Publishing.
分类号	一类/力学重要期刊
WOS关键词	VOLTAGE SPACE PLATFORMS ; IONOSPHERIC PLASMA-FLOW ; ELECTRON
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000505980600057
其他责任者	Wang, Joseph
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/81320]
专题	力学研究所_高温气体动力学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China 2.Univ So Calif, Dept Aeronaut Engn, Los Angeles, CA 90089 USA;
推荐引用方式 GB/T 7714	Wang J,Hu Y. On the limitations of hybrid particle-in-cell for ion thruster plume simulations[J]. PHYSICS OF PLASMAS,2019,26(10):8.
APA	Wang J,&胡远.(2019).On the limitations of hybrid particle-in-cell for ion thruster plume simulations.PHYSICS OF PLASMAS,26(10),8.
MLA	Wang J,et al."On the limitations of hybrid particle-in-cell for ion thruster plume simulations".PHYSICS OF PLASMAS 26.10(2019):8.