高氣壓超短納秒脈沖氣體放電數(shù)值模擬.pdf

1、大連理工大學(xué)碩士學(xué)位論文高氣壓超短納秒脈沖氣體放電數(shù)值模擬姓名：石鋒申請學(xué)位級別：碩士專業(yè)：等離子體物理指導(dǎo)教師：王德真20080601高氣壓超短納秒脈沖氣體放電數(shù)值模擬NumericalSimulationsofSuper—ShortNanosecondPulseGasDischargeatHighPressuresAbstractInrecentyears，theplasmaphysicsscientificcommunityhas

2、paidmuchattentiontothedeve1opmentofhighpressure，particularlyatmosphericpressure，non—equilibriumplasmasourcesHighvoltagenanosecondpulsedischargemodeisoneofthemostpromisingwaystogeneratelargevolumenonequilibriumplasmas，and

3、thushasbeenmotivatedbynumerouspotentialdischargeapplicationsThebetterunderstandingsofthespatial—temporaldynamicbehaviorsofatmosphericpressurenanosecondpulsedischargeareveryusefultoproduce，stabilizeandcontroltheatmospheri

4、cnonequilibriumplasmasThegenerationoflargevolumelowpressurenon—equilibriumplasmasiSfirstintroducedinthisdissertation，andthenthegenerationoflargevolumeatmosphericpressurenon—equilibriumplasmas，aswellastheirapplications，is

5、presentedTIletheoreticalstudiesandnumericaltechniquesofhigllpressuregasglowdischargearealsogivenHigh—voltagenanosecondpulsegasdischargetoobtainthelarge—volumeuniformnonequilibriumplasmasisintroducedandsimulatedwithld3vPI

6、CMCCinconjunctiontotherenormalizationandweightingprocedureinthisdissertationThenumericalresultsshowUSthequitesimilarspatialtemporalbehaviorsofatmosphericpressurenanosecondpulsegasdischargeinnoblegasesTheplasmadensityincr

7、easesdramaticallyduringthepulsedischargeduetotheavalancheionizationThereexisttheeffectsoflocalreversefieldanddoublepeakdistributionsofchargedparticles’densityinhi曲pressurenanosecondpulsedischargeTheevolutionsofelectron，i

8、onanddisplacementcurrentdensitiesalongthedischargegapareallillustratedaswell，andwecanseethattheindependenceoftotalcurrentdensityisfunctionoftime，butnotofpositionTheelectronandionenergydistributionfunctionsarealsoobserved

9、fromwhichitiSconcludedthatlargevolumenonequilibriumplasmacanbeachievedwithhighvoltagenanosecondpulsedischargeInaddition，theeffectsonthedischargeevolutionhavebeenpresentedanddiscussedwhentheappliedpulsevoltageamplitudeort