›› 2017, Vol. 37 ›› Issue (5): 81-.doi: 10.16708/j.cnki.1000-758X.2017.0081

• 研究探讨 • 上一篇    

同轴微阴极电弧推力器的粒子网格法数值模拟

 熊子昌, 耿金越, 陈轩, 王海兴   

  1. 1北京航空航天大学宇航学院,北京100191
    2北京控制工程研究所,北京100094
    3空间物理重点实验室,北京100076
  • 收稿日期:2017-05-04 修回日期:2017-07-24 出版日期:2017-10-25 发布日期:2017-09-12

Particleincellsimulationofacoaxialmicrocathodearcthruster

 XIONG  Zi-Chang, GENG  Jin-Yue, CHEN  Xuan, WANG  Hai-Xing   

  1. 1SchoolofAstronautics,BeihangUniversity,Beijing100191,China
    2BeijingInstituteofControlEngineering,Beijing100094,China
    3ScienceandTechnologyonSpacePhysicsLaboratory,Beijing100076,China
  • Received:2017-05-04 Revised:2017-07-24 Online:2017-10-25 Published:2017-09-12

摘要: 采用粒子网格方法对同轴微阴极电弧推力器μCAT工作过程进行了模拟研究, 并应用自相似方法对模型进行简化,获得了推力器羽流区的电子数密度分布、离子数密度分布、电势分布及离子轴向平均速度,通过改变磁感应强度和位形分析磁场对推力器内等离子体运动特性及推力器性能的影响。计算结果表明,电子被外加磁场捕获约束在磁力线附近,低速离子与高速电子形成的双极扩散电场加速离子喷出;在相同流量情况下,磁感应强度002T时,离子返流严重,磁感应强度005~030T时,磁感应强度变化对速度影响较小;磁场位形对离子运动和推力器性能有较大影响,磁力线与轴线夹角较小时离子速度下降明显,夹角较大时离子返流严重。

关键词: 同轴微阴极电弧推力器, 粒子网格法, 自相似法, 磁感应强度, 磁场位形

Abstract: Amodelingstudywasperformedtoinvestigatetheworkingprocessofacoaxialmicrocathodearcthrusterwithparticleincell(PIC)method,andtheselfsimilarmethodwasappliedtosimplifythesimulationmodel.Thedistributionofelectronnumberdensity,ionnumberdensity,electricpotentialandaxialaverageionvelocityinthethrusterplumeregionwasobtained.Theinfluencesofmagneticfieldonplasmamotioncharacteristicsandthrusterperformancewerestudiedbychangingmagneticfluxdensityandmagneticfieldtopology.Theresultsshowthatelectronsareconstrainedbytheappliedmagneticfield,cyclingaroundmagneticfieldlines,andthationsareacceleratedbytheambipolardiffusionelectricfieldproducedbyslowerionsandfasterelectrons.Withthesamemassflowrate,theionrefluxisseverewhenthemagneticfluxdensityis002T,whiletheionvelocityislessaffectedbythemagneticfluxdensitywhenthemagneticfluxdensityis005~030T.Magneticfieldtopologyhasgreatinfluenceontheionmotionandthrusterperformance.Theionvelocitydecreasesobviouslywhentheanglebetweentheaxisandmagneticfieldlinesissmall,whiletheionrefluxisseverewhentheangleislarge.

Key words: coaxialmicrocathodearcthruster, particleincell, selfsimilarity, magneticfluxdensity, magneticfieldtopology