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1、343Turbinebladecooling:thebladetemperaturedistribution12JHHorlockandLTorbidoni1WhittleLaboratory,CambridgeUniversity,Cambridge,UK2AnsaldoEnergia,Genoa,ItalyThemanuscriptwasreceivedon29March2005andwasacceptedafterrevisionforpublicationon6January2006.DOI:10.1243/09576509JPE177Abstract:Aircooling
2、ofhigh-temperaturegasturbinesisastandardpractice;theair?rstcoolsthebladingbyinternalconvectionandthenbyexternal?lmcooling,afterejectionthroughholesandslotsinthebladesurface.Insome‘conventional’analysesofturbinebladecooling,a‘standardblade’isinvoked,whichhasauniformbladetemperatureequaltotheaver
3、agetemp-eratureoftherealblade,andestimatesaremadeofthecooling?owrequiredtoholdthestan-dardbladetemperaturetoalimitsetbymaterialconsiderations.However,earlyanalyticalworkbyAinley(forconvectivecoolingofthin-walledblades)showedthatboththecoolantandbladetemperaturesshouldincreasealongthebladespan.T
4、hecurrentpaperdevelopsAinley’soriginalanalysistoallowfor?nitebladewallthicknessandthermalbarriercoatings,?lmcooling,andvariationinthemainstreamgastemperaturealongthespan.Thisnewanalysisshouldenablemoreaccurateestimatestobemadeofcoolingair?owrequirements.Keywords:turbinecooling,bladetemperature,
5、coolant?ow1INTRODUCTIONaprescribedlevel.Thismaybeonereasonforthehigh-safetyfactorsthatthenhavetobeusedinInsome‘conventional’analysesofturbinebladesuchanalyses.cooling,a‘standardblade’isinvoked,whichhasauniformbladetemperatureequaltotheaverage2AINLEY’SANALYSIStemperatureoftherealblade;itbeingimp
6、liedthatthebladefailsatthisuniform,andaverage,temp-erature[1].Here,theoriginalworkofAinley[2]isInhisseminalpaper,Ainleypresentedabasicre-examinedanalytically;hesuggestedthattheanalysisforconvectivelycooled,thin-walledbladesblademetaltemperatureTb(y)increaseswithspan-ofconstantsection,subjecttoa
7、uniforminletgaswisedistancefromtheroot,(y),notattainingatemperatureTg.maximumuntiltheendoftheblade(y?H).Hisworkleadstothedistributionsofbladetempe-ThecurrentworkmayberegardedasaninitialstepratureTb(y)andcoolanttemperatureTcl(y)alo
