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1、4.34.3-1IntroductionTurbineBladeAerodynamicsTheaerodynamicsofthe?owinaturbinestage(stator/rotor)israthercomplexandisstillthesubjectofmanyongoingresearchactivitiesinthegasturbinecommunity.The?owisinherentlythreedimensionalduetothevane/bladepassagegeometrywithfeaturessuchastwistingofthevane/b
2、ladealongthespan,clearancebetweenthebladetipandtheshroud,?lmcoolingholes,andendwallcontouring1.Thepassage?owischaracterizedbyboundarylayereffects,secondary?owsgeneratedbythepassagepressuregradients,andvortical?owstructuressuchastheleadingedgehorse-shoevortices,tip-leakage?owvortices,andcorn
3、ervortices2.Theeffectsofcentrifugal-buoyancy,shock-boundarylayerinteraction,and?owinteractionsbetweenthestatorandrotorrowscomplicatethepassage?ow?eldevenfurther.Alongtheendwalls,the?owstructureisstronglythree-dimensionalwiththepassagevortexandcoolantinjectiononthehubsideandthetip-leakagevor
4、texonthetipside.Inthemid-spanregionslocatedawayfromthepassagewallsandoutsidetheviscousshearlayer,theradial?owisalmostnegligibleandSumantaAcharyathe?owiseffectivelytwodimensional.The?uiddynamicsinthisregioncanthenbebasedontwodimensionalplanarcascade?owstudieswithoutanysigni?cantlossofinforma
5、tion.Thethreedimensionalcomplex?owstructuresnearthehubendwallregionandinthebladetip-shroudclearancehavebeensimulatedinannularvane/bladepassageswithandwithoutrotatingbladerow3.Studiesofthecomplexend-wall?owshavealsobeenperformedinstationarycascadeswiththreedimensionalairfoilshapes4.Thequalit
6、ativefeaturesofthepassage?ows,whichcomprisemainlyofthepassagecross?ow(?owfromthepressuresideofvane/bladetosuctionsideofadjacentvane/blade)andvortical?owsinducedbytheleadingedge,thecorners,andtheinjectedcoolant?owshavebeenstudiedindetailinstationarycascadesandareconsideredtobesimilarinbothst
7、ationaryandrotatingbladerows.Theprimarydifferenceinthesecondary?owstructurebetweenthebladepassageandvanepassageisthattheGaziMahmoodvortical?owsandcross?owsinthebladepassagearestrongerbecauseofhigherturningofthe?owsalongthebladepassage.Secondary?owsarethe
