低流量系数离心式压气机级间流动的数值模拟PPT课件下载推荐.pptx

低流量系数离心式压气机级间流动的数值模拟PPT课件下载推荐.pptx

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=0.020.08（usually2Dimpellers）High-flowcentrifugalstages:

=0.080.15（usually3Dimpellers）TheLoawim-floowfscteundtyrifiusgatolsitdaegnetsi:

fym=a0i.n00p3ecu0l.i0a2ritiesoflowflowratestagessimulatingandtodevelopsomerecommendationsforcalculations,4,5,Theobjectofstudy,0.010.010.005,ConditionalflowratecoefficientDiskfrictioncoefficientLeakagescoefficient,Totalworkcoefficient,Stage3impeller,Stage1,Stage4,Stage8,Stage2impellerblades,SelectedstageswereexperimentallytestedandareownedbyDepartmentofCompressor,VacuumandRefrigerationEngineeringofPetertheGreatSaint-PetersburgPolytechnicUniversity,Stage1calculation,Stage1meridionalsection,6,Stage1computationalmodel,Stagepdaesriganm=0e.t0er0s8:

3theor=0.48b2/D2=0.013,Stage1calculation,Labyrinthsealmeshvariations,7,Gridindependencestudy,Y+,1inwhole,computationaldomain,Flowpathmesh,Stage1calculation,Inletpressure1bar;

smoothwalls,8,Stage1calculation,Inletpressure1bar;

surfaceroughness,9,Stage1calculation,Inletpressure5bar;

smoothwalls,10,Stage1calculation,Inletpressure5bar;

surfaceroughness,11,Stage1calculation,Inletpressure11bar;

surfaceroughness,12,13,Stage1calculation,Influenceofsecondaryfrictionsurfaces,Computationaldomainwiththediskbase,Resultsofcalculations,Stage2calculation,Stageparameters:

design=0.008theor=0.52b2/D2=0.013Numberofchannels:

8Theinletpartofbladechannelswasdesignedalongwithlogarithmicspiral,sincethemainpartofthebladechannelisastraight-axisdiffuser,14,Stage2calculation,Inletpressure5bar;

smoothwalls,15,Stage2calculation,Inletpressure5bar;

surfaceroughness,16,Stage2calculation,Influenceoftheimpellerandstatorelementsroughness,17,18,Stage3calculation,Stageparameters:

design=0.015theor=0.55b2/D2=0.019Radiallabyrinthsealing,Flowsthroughlabyrinthseals,Stage3impellermeridionalsection,Stage3calculation,Inletpressure1bar;

surfaceroughness,19,Stage3calculation,Inletpressure5bar;

surfaceroughness,20,21,Stage8calculation,Stageparameters:

design=0.0034theor=0.62b2/D2=0.005,Stage8impeller,Stage8meridionalsection,Stage8calculation,Inletpressure11bar,22,Stage8calculation,Totalandpolytropicworkcoefficients,23,Stage8calculation,Theflowthroughlabyrinthsealsandeffectiveimpellerflowat=0.002,24,Stage8calculation,Thetotalpressuremeridionalcontourattheoperatingpoint=0.0037,25,26,Conclusion,experimentalstagescharacteristicswasobtained.Thegeneralsimulatingtendencyoflow-flowratestagesisoverestimatingthetotalworkcharacteristicatlowReynoldsnumbersandthecharacteristicsdisplacementinmostcasestotherightzoneoftheflowcoefficient.allowancefortheroughnessofrotorelements.Theroughnessofstatorelementshasmuchlessinfluence.featuresoflow-flowratestagesandchangethecalculatedcharacteristicssignificantly.Itisimportanttoobservegridconvergenceinregionsofcavitiesandlabyrinthseals.,Thankyouforattention!

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