›› 2016, Vol. 36 ›› Issue (3): 15-23.doi: 10.16708/j.cnki.1000-758X.2016.0035

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Non-equilibriumnumericalsimulationofalowpowernitrogen/hydrogenarcjet

 WEI  Yan-Ming1,3, HE  Qing-Song2, WANG  Hai-Xing2,*   

  1. 1BeijingInstituteofControlEngineering,Beijing100190,China
    2SchoolofAstronautics,BeihangUniversity,Beijing100191,China
    3HarbinInstituteofTechnology,Harbin150001,China
  • Received:2015-12-06 Revised:2016-04-02 Online:2016-06-25 Published:2016-05-11

Abstract: Thermalandchemicalnonequilibriummodelingsstudywereperformedonalowpowernitrogen/hydrogenarcjet.Separateenergyequationswereformulatedfortheelectronsandtotalspecies,andsevenspeciesnitrogen/hydrogenplasmacompositionofmolecules,atoms,ionsandelectronswasassumed.Someimportantchemicalkineticprocessesofdissociationandionizationwereconsideredinthechemicalnonequilibriummodel.Theplasmapropertieswerecalculatedaccordingtothelocalspeciesnumberdensityandtemperature.Thedistributionoftemperatureandthenumberdensityofeachspeciesinthearcjetwereobtained.Theresultsshowthattheaxisofarcjetisclosetothermalequilibriumandsignificantdeviationfromthermalequilibriumisfoundinthearcattachmentregion.Itisshownthatthespeciesdistributionsofnitrogenandhydrogenaresignificantlydifferentfromthoseattheinletofthruster,whichindicatesthatthereexistthedemixingprocessesinsidethruster.Itisfoundthatthehydrogenspeciesdecreaseatfirstandthenincreasealongtheradialdirectionfromthecentertotheinnerwallofthruster,whilethenitrogencomponentsshowtheoppositetrend.Furtheranalysisshowsthatthespeciesdiffusionsinsidearcjetaredrivenbymolefractiongradientswhichareduetothedissociationandionizationofnitrogenandhydrogenspecies.

Key words: nitrogen/hydrogenarcjet, nonequilibrium, numericalsimulation, chemicalkinetics, electricpropulsion