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1、ProceedingsofASMETurboExpo2011GT2011June6-10,2011,Vancouver,BritishColumbia,CanadaGT2011-45238BLADELOADINGANDITSAPPLICATIONINTHEMEAN-LINEDESIGNOFLOWPRESSURETURBINESJohnD.Coull,HowardP.HodsonWhittleLaboratoryUniversityofCambridge,UKABSTRACTdiagramsindicatin
2、gtheapproximateflowanglesandpossibleInordertominimizethenumberofiterationstoaturbinebladeshapeshavebeenadded.design,reasonablechoicesofthekeyparametersmustbemadeAstheflowcoefficientisincreased(movingfromtheattheearliestpossibleopportunity.Thechoiceofbladel
3、oadingbottomlefttothebottomrightofFig.1),thethrough-flowisofparticularconcerninthelowpressure(LP)turbineofcivilvelocitiesincreaserelativetothebladespeedastheflowaeroengines,wheretheuseofhigh-liftbladesiswidespread.becomesmoreaxial.Foragivenchangeintangenti
4、alvelocity,Thispaperpresentsananalyticalmean-linedesignstudythiscausesanincreaseinthedynamicpressureswhichtendstoforarepeating-stage,axial-flowLowPressure(LP)turbine.increasethelosses.Furthermore,lossesincreasebecausethereTheproblemofhowtomeasurebladeloadi
5、ngisfirstisasmalleroverallaccelerationthroughthebladerow.Suchaddressed.TheanalysisdemonstratesthattheZweifelaccelerationisbeneficialasittendstominimizethegrowthofcoefficient[1]isnotareasonablegaugeofbladeloadingtheboundarylayersandsecondaryflows.becauseiti
6、nherentlydependsontheflowangles.AmoreAsthestageloadingcoefficientisincreased(movingfromappropriatecoefficientbasedonbladecirculationisproposed.thebottomlefttothetopleftofFig.1),thechangeinwhirlWithoutalargesetofturbinetestdataitisnotpossibletovelocityacros
7、sthebladerowbecomeslarger.Toachievethisdirectlyevaluatetheaccuracyofaparticularlosscorrelation.additionalturningonemusteitheremploybladeswithhigherTheanalysisthereforefocusesontheefficiencytrendswithcirculation(loading),ordecreasethepitch(whilemaintainingr
8、especttoflowcoefficient,stageloading,liftcoefficientandcirculation).Bothtendtoincreaseloss,asdoesthehighexitReynoldsnumber.Ofthevariouslosscorrelationsexamined,flowanglefromthesedesigns(seeequation(14)below).
