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1、PlasmaChemistryandPlasmaProcessing,Vol.17,No.4,1997ModelingofaDCPlasmaTorchinLaminarandTurbulentFlowJ.M.Bauchire,1J.J.Gonzalez,1andA.Gleizes1ReceivedDecember2,1996;revisedMarch11,1997Amathematical2Drepresentationisdevelopeddescribingthetemperatureandthevelocityp
2、rofilesinaDCplasmatorchandintheresultingplume.ItisbasedontheresolutionofconservationequationsusingtheSimplemethodafterPatankar.Inthefirstpart,weillustratetheeffectsoftheturbulence,using,ontheonehand,twoPrandtl'smixinglengthmodelsand,ontheotherhand,astandardk-emo
3、del.Wealsoshowtheinfluenceofphysicalparametersliketheinletmassflowrate,thecurrentintensity,andthekindofgas(argonorair)onthecharacteristicsoftheplasma.Thesecondpartofthisstudypresentsacomparisonofthemodelwithexperimentalresultsencounteredintheliterature.Theprofil
4、esobtainedattheexitofthetorcharecomparedtothemathematicalformulationusedasboundarycondi-tionbythemodelstakingintoaccountonlytheplasmajet.KEYWORDS:Plasmatorch;modeling;laminarandturbulentflow.1.INTRODUCTIONInordertoprovidehighqualityforspecializedapplicationsandt
5、oaidinthedevelopmentofthetechnology,manystudiesofelectricarcs,especiallynontransferredarcs,havebeenmade.Comparisonbetweenexperimentalresultsandthemodelsleadstorefinementofthecalculationbytakingincreasinglysophisticatedphenomenaintoaccount.Manyofthesestudieswereo
6、nlymadeontheplasmajet.Wecanmen-tionforexamplethemeasurementsofCapettiandPfender(1)andDilawarietal.(2)OtherworksbyMcKelligetetal.(3)andChangandRamshaw(4)havetreatednumericalsimulationsofargonplasmajetsflowingintocoldairandnitrogenrespectively.Foralltheseapplicati
7、onsthebehavioroftheplasmaisessentiallystudiedthroughturbulencelikeinthepaperofHuangetal.(5)concerningatwo-fluidmodelofturbulencewhichcanpredictphenomenathatescapemoreconventionalmodels,e.g.,unmixingcalculations.Thesemodelsofthefreeplasmajetrequireadjustabledataf
8、orthetemperature1CentredePhysiquedesPlasmasetdeleursApplicationsdeToulouse,E.S.A.No.5002,UniversitePaulSabatier,118routedeNarbonne,31062ToulouseCedex4,France.4090272-
