第23卷第2期2023年2月过程工程学报TheChineseJournalofProcessEngineeringVol.23No.2Feb.2023Cavitationanalysisandstructureimprovementofcage-typedcontrolvalveincoalliquefactionindustryChangQIU1,RuibinGAN2,YunfeiLONG2,QiangRU2,JinyuanQIAN1,3,ZhijiangJIN1*1.InstituteofProcessEquipment,CollegeofEnergyEngineering,ZhejiangUniversity,Hangzhou,Zhejiang310027,China2.SUFATechnologyIndustryCo.,Ltd.,CNNC,Suzhou,Jiangsu215129,China3.StateKeyLaboratoryofFluidPowerandMechatronicSystems,ZhejiangUniversity,Hangzhou,Zhejiang310027,ChinaAbstract:Aimingatthecommoncavitationproblemofthecage-typedcontrolvalveinthecoalliquefactionindustry,basedontheRANSequation,themixturemultiphaseflowmodelandtheZwartcavitationmodel,anumericalsimulationstudyofthecavitationflowinsidethevalvewascarriedout,andthemainreasonofthecage'sfailurewasdetermined.Basedonthepressuredropanalysisandpredictionofthecavitationposition,astructuralimprovementschemeofthecontrolvalve'scagewasproposedandverified.Theresultsshowedthatthecavitationvaporinthecontrolvalvewasconcentratedintheinnerorificeofthecage,whichwasthemainreasonfortheobviousfailuredefectsintheinnerwalloftheinnerorificeandthecage.Basedonthecomparisionsbetweenpressuredropandcavitationvapordistributionsonthehorizontalcrosssectionofthevalvecage,thetworeasonsfortheseriouscavitationintheinnerorificeofthecagewereconcluded.Firstly,thenumberofdepressurizationstageswasnotenough,whichledtoexcessivepressuredropinthesecondstage,resultinginalocallowpressurearea,andcavitationoccursviolently.Secondly,thedepthoftheinnerorificewastoolarge,resultinginfullydevelopedcavitationintheinnerlayerorificeofthecage.Thus,thestructureimprovementschemewasproposedtocontrolthedepressurizationintensityandtheoccurrenceareaforcavitationdevelopmentinthecage.Byadjustingthestraightorificeintheinnerlayerofthevalvecagetosteppedorifice,theadjustmentfromtwo-stagetothree-stagedepressurizationwasrealized,whichsolvedtheproblemoflocallowpressureareacausedbyexcessivepressuredrop,andeffectivelyreducedthestrengtho...
