NLH方法在离心式压气机级上的应用优质PPT.pptx

NLH方法在离心式压气机级上的应用优质PPT.pptx

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DRadialMachinery,ApplyingNLHonacentrifugalcompressorstage,MANDiesel&

Turbo,25.11.2019,Overview,ApplyingNLHonacentrifugalcompressorstage,MANDiesel&

Turbo,25.11.2019,IntroductionInfluenceofamixingplaneonavanelesscentrifugaldiffuserNLH-CalculationofastageincludingtwostatorrowsSummary&

Conclusions,Background,ReducingthediffuserratioofavanelessdiffuserinordertodecreasetheframesizeandcostsofacentrifugalcompressorhigherlossesIncreasingorretainingtheefficiencyoftheoriginalstagebyapplyingdiffuservanesuptotheU-TurninletEnlargingdiffuservanesintotheU-Turntoincreasetheflowanglefurther,diffuserratio,ApplyingNLHonacentrifugalcompressorstage,MANDiesel&

Turbo,25.11.2019,Methodology,ApplyingNLHonacentrifugalcompressorstage,MANDiesel&

Turbo,25.11.2019,StageperformancepredictionbyutilisingCFDCreatingmeshesforstagewithvanelessandvaneddiffuserinAutogridSteadystatesimulationsGeneratingmeshesforstageincludingrotorandtwostatorvanesinAutogridbytandemfunctionalityandsecondrotor-stator-interfaceSteadystateandNLHsimulation,MotivationofusingNLH,ApplyingNLHonacentrifugalcompressorstage,MANDiesel&

Turbo,25.11.2019,Steadystatesimulations:

DiffuservanesclosetotherotorareexpectedtocausehighinteractionscriticalformixingplaneapproachMixingprocessofthevanewakedisturbedUnsteadysimulations:

UsingtransientcalculationsovercomethementionedissuesBut:

Muchhighercomputationaleffortnecessary,NLHoffersthepossibilitytoovercomethemixingplaneproblemswhilestillhavingreasonablecomputationalefforts,Objectives,ApplyingNLHonacentrifugalcompressorstage,MANDiesel&

Turbo,25.11.2019,InvestigationoftheeffectonstageperformancebyapplyingmixingplanesConsideringthechangeincomputationaleffortduetotheapplicationofNLHcomparedtostationarysimulationsInvestigationofthestabilityandconvergenceofNLHinacentrifugalcompressorstagecontainingrotor,diffuserandreturnchannelvanes,Influenceofamixingplaneonvanelessstageperformance,r/r2=1.06IncreaseinstaticefficiencyduetothemixingplaneIncreaseintotalefficiencytowardssurge,0.1,ApplyingNLHonacentrifugalcompressorstage,MANDiesel&

Turbo,25.11.2019,Influenceofamixingplaneonvanelessstageperformance,OnlysmalldifferencesintotalpressurelosscoefficientalmostconstantLargevariationonstaticpressurepressurerecoverycoefficientsignificantlychangedHigherstaticpressureresultsinsmalleroveralllossesandhigherstageefficiencyapproximately1%highertotalstageefficiency,staticefficiencydecreasedby1%Reasonablecomparisonbetweenvanelessandvaneddiffuserstagesonlywithmixingplaneinbothstagespossible,ApplyingNLHonacentrifugalcompressorstage,MANDiesel&

Turbo,25.11.2019,Considerationoftwostatorrows,InvestigationrequiressamenumberofdiffuserandreturnchannelvanesClockingcannotbeneglected（incontrasttomixingplane-approach）additionaldegreeoffreedominthedesignprocessTandemconfigurationdeterioratethemeshqualityduetodependencybetweenvanemeshesMostproblemssolvedbyNLHAutogridtandemconfiguration,ApplyingNLHonacentrifugalcompressorstage,MANDiesel&

Turbo,25.11.2019,InfluenceofNLHonflowfield,Considerationwithoutreturnchannel10NLHresultshowsbackflowatthecasingbetweenthediffuservanesSimilaritiestotheresultsofthemixingplaneeffectinvestigationFlowangleprofilesacrosstheentirestagechangeIncidenceofstatorandreturnchannelvanesdifferentplane510plane4,ApplyingNLHonacentrifugalcompressorstage,MANDiesel&

Turbo,25.11.2019,InfluenceofNLHonflowfield,Steadystate50%,NLH,10%span,ApplyingNLHonacentrifugalcompressorstage,MANDiesel&

Turbo,25.11.2019,90%span,Flowseparatesearlier,ReturnchannelvaneschangetheirperformanceduetodeviatedflowVelocityattheinnerU-Turnradiusishigherthaninsteadystate,InfluenceofNLHonflowfield,plane4,ApplyingNLHonacentrifugalcompressorstage,MANDiesel&

Turbo,25.11.2019,NLHconvergence&

computationtime,ConvergencehighlydependantontheoperatingconditionsIssuesarisingfromseparatedflowSimilarnumberofiterationsnecessarytogaindesiredconvergenceatDPConvergenceratedependantonnumberofbladerowsbutnotontheconfiguration（tandem,interface）TimeperiterationsignificantlyincreasedwithNLHExample:

Stagewithrotor,vaneddiffuserandreturnchannelvanesStagecontainstwointerfaces（3.3Mionodes,5processes）,ApplyingNLHonacentrifugalcompressorstage,MANDiesel&

Turbo,25.11.2019,Summary&

Conclusion,ApplyingNLHonacentrifugalcompressorstage,MANDiesel&

Turbo,25.11.2019,MixingplanesclosetotherotorreducethelossesduetomixingNLHofferstoimprovetheperformancepredictionwhilestillusingthesamemeshesthaninthe