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On the limitations of hybrid particle-in-cell for ion thruster plume simulations
Wang J1; Hu Y(胡远)1,2
Corresponding AuthorWang, Joseph(
Source PublicationPHYSICS OF PLASMAS
AbstractA 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.
Indexed BySCI
WOS IDWOS:000505980600057
WOS Research AreaPhysics
WOS SubjectPhysics, Fluids & Plasmas
ContributorWang, Joseph
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Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Univ So Calif, Dept Aeronaut Engn, Los Angeles, CA 90089 USA;
2.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China
Recommended Citation
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.
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