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简介:Thecentralpostisoneofthecriticalcomponentsforthelowaspectratiotokamak,whichenduresnotonlyatremendousohmicheatingbecauseitcarriesaratherhighcurrent,butalsoalargeneutronheatingandirradiationowingtotheplasmaoperation.TheDScopperalloyGlidcopAL-25[8]waschosenastheconductormaterialforitsadequatemechanicalpropertiesandphysicsproperties.Thecentralposthasacylindricalstructurewithlotsofcoolingchannels.Thelengthofthecentralpostforthenextgenerationofnuclearfusionsphericaltokamakswillbemorethan10mor20m.Thestructuralstabilityisverycrucial.Whentheappliedloadislargerthanthestructurecriticalbucklingload,thedevicewillloseitsstabilityandcollapse.Inordertocal'culatethecriticalbucklingload,a1/6-segmentfiniteelementmodelwasusedandtheforceactingonthecentralpostwassimulated.Theresultsshowedthattheverticalcompressivestressesmainlyaffectthestabilityofthecentralpost.Thelinearbucklinganalysisresultswithfiniteelementmethodbasedonsmalldeformationtheoryweregiveninthispaper.Therelationcurvesandfunctionsforbucklingfactor,dependingonthedifferentlengthsandtheradiusofthecentralpost,thediameterofcoolingchannelandthemaximumallowablecurrentdensity,werealsoshown.
简介:Anexperimentandanalysisonremovalofgaseousbenzenebypulsecoronainducedplasmaispresentedinthisarticle.Importantparameterseffectingremovalefficiencyhavebeeninvestigated,suchaspulsepeakvoltage,pulsefrequency,gasinletconcentration,gasflowrateandreactortemperature.Theresultshowsthattheremovalefficiencyincreaseswiththeincreaseinpulsepeakvoltage,pulsefrequencyandreactortemperature,butdecreasesintheriseofgasinletconcentrationandgasflowrate.OntheconditionofVp=36kV,f=80Hz,C=1440mg/m^3andQ=640ml/min,thelargestremovalefficiencyis98%.Finally,thereactedproductsarequalitativelyanalysedandthereactionprocessesarededucedincombinationwithplasma-chemistrytheory.