turbulent decay of after spark channels

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1、PHYSICSOFPLASMAS13,073501
2006Turbulentdecayofafter-sparkchannelsM.N.ShneiderDepartmentofMechanicalandAerospaceEngineering,PrincetonUniversity,Princeton,NewJersey08544
Received17April2006;accepted17May2006;publishedonline6July2006Atheoreticalmodelisproposedforperformingself-consistentcalcula

2、tionsoftheentireevolutionofasparkdischargeandthesubsequentcoolingofthepostdischargechannelanddielectricrecovery,takingintoaccountthegenerationanddissipationofanintenseturbulentßowinanafter-sparkchannel.Classicalcascadeandnoncascademechanismsofaturbulencedissipationarediscussed.Thestabilizingef

3、fectofthecontinuousresidualelectriccurrentontheplasmacoolinginthechannelisanalyzed.Theresultsforcomputedrateofrestorationofdielectricstrengtharecomparedwithknownexperiments©2006AmericanInstituteofPhysics.DOI:10.1063/1.2218492I.INTRODUCTIONonlyMcomponentscandevelopinthechannelratherthan9theda

4、rtleaderofthesubsequentstroke.Probably,asimilarThepulsedarcshavebeentraditionallyusedinhigh-plasmachannelstabilizationwiththeresidualcurrentoran-1currentandhigh-voltagecommutatorsandthepossibilityofotherkindofpostdischargeheatsourcecanbeusedforcre-afastcurrentdiscontinuinganddielectricstrength

5、recoveryationoflong-livedhigh-conductivityextendedplasmaisveryimportantforincreasingrepetitivefrequenciesoftheantennas.10,11commutators.Theissueofthecoolingspeedofahotafter-Itisofgreatinteresttoinvestigatetherelationshipbe-sparkchannelisofasigniÞcantpracticalimportance:thetweentheinnerandexter

6、nalparametersofthechannelpriortimeittakesforthegastocooldownafterhavingconductedtotheformationofafullydevelopedturbulentßowaswellacurrentpulsedeÞnedoneofthemostimportantcharacter-astheoriginofturbulenceandthedynamicsofitscharacter.isticsofgasdischargersÐtherateofrestorationofdielectricThiswork

7、studiestheformationofanintenseturbulentstrength
RDS.ßowinanafter-sparkchannel.AbasictheoreticalmodelItisknownthataturbulentgasßowformsinacoolingbasedonaclosedsystemofthe1Dnonstationarygasdy-downafter-sparkchannel.ThiscausesamoreefÞcien