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ID:8000042
大小:4.89 MB
页数:28页
时间:2018-03-03
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1、4.34.3-1IntroductionTurbineBladeAerodynamicsTheaerodynamicsoftheflowinaturbinestage(stator/rotor)israthercomplexandisstillthesubjectofmanyongoingresearchactivitiesinthegasturbinecommunity.Theflowisinherentlythreedimensionalduetothevane/bladepassagegeometrywithfeaturessuchastwistingofthevane/b
2、ladealongthespan,clearancebetweenthebladetipandtheshroud,filmcoolingholes,andendwallcontouring1.Thepassageflowischaracterizedbyboundarylayereffects,secondaryflowsgeneratedbythepassagepressuregradients,andvorticalflowstructuressuchastheleadingedgehorse-shoevortices,tip-leakageflowvortices,andcorn
3、ervortices2.Theeffectsofcentrifugal-buoyancy,shock-boundarylayerinteraction,andflowinteractionsbetweenthestatorandrotorrowscomplicatethepassageflowfieldevenfurther.Alongtheendwalls,theflowstructureisstronglythree-dimensionalwiththepassagevortexandcoolantinjectiononthehubsideandthetip-leakagevor
4、texonthetipside.Inthemid-spanregionslocatedawayfromthepassagewallsandoutsidetheviscousshearlayer,theradialflowisalmostnegligibleandSumantaAcharyatheflowiseffectivelytwodimensional.Thefluiddynamicsinthisregioncanthenbebasedontwodimensionalplanarcascadeflowstudieswithoutanysignificantlossofinforma
5、tion.Thethreedimensionalcomplexflowstructuresnearthehubendwallregionandinthebladetip-shroudclearancehavebeensimulatedinannularvane/bladepassageswithandwithoutrotatingbladerow3.Studiesofthecomplexend-wallflowshavealsobeenperformedinstationarycascadeswiththreedimensionalairfoilshapes4.Thequalit
6、ativefeaturesofthepassageflows,whichcomprisemainlyofthepassagecrossflow(flowfromthepressuresideofvane/bladetosuctionsideofadjacentvane/blade)andvorticalflowsinducedbytheleadingedge,thecorners,andtheinjectedcoolantflowshavebeenstudiedindetailinstationarycascadesandareconsideredtobesimilarinbothst
7、ationaryandrotatingbladerows.TheprimarydifferenceinthesecondaryflowstructurebetweenthebladepassageandvanepassageisthattheGaziMahmoodvorticalflowsandcrossflowsinthebladepassagearestrongerbecauseofhigherturningoftheflowsalongthebladepassage.Secondaryflowsarethe
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