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1、Researchreport2011:01BoundaryLayerTransitionalFlowinGasTurbinesMOHSENJAHANMIRIDivisionofFluidDynamicsDepartmentofAppliedMechanicsCHALMERSUNIVERSITYOFTECHNOLOGYGöteborg,Sweden,2011BoundaryLayerTransitionalFlowinGasTurbinesMOHSENJAHANMIRI©MOHSENJAHANMIRI,2011Researchreport2011:01ISSN
2、1652-8549DivisionofFluidDynamicsDepartmentofAppliedMechanicsCHALMERSUNIVERSITYOFTECHNOLOGYSE-41296GöteborgSverigeTelephone+46(0)3177210002BoundaryLayerTransitionalFlowinGasTurbinesMohsenjahanmiriDept.ofAppliedMechanics,ChalmersUniversityofTechnologyGöteborg,Sweden&Dept.ofMech.andAe
3、rospaceEngineering,ShirazUniversityofTechnologyShiraz,IranAbstractThedistinguishingfeaturesoftransitioninturbomachineryflowsarethattheyareunsteadyontimescaleslongerthantypicaleddyturnovertimes,occurinharshandhighlydisturbedenvironmentsatawkwardReynoldsnumbers,andaregenerallythree-d
4、imensional(eveninthemean).Asaconsequence,theflowisaveritable-fluid-dynamical‘zoo’,characterizedbyseparation,reattachment,transition,relaminarization,retransition,etc.,alloftenoccurringinthesameflow.Buthowimportantistransitionresearchfortheturbomachineryindustry?GEcompressortests(ma
5、debyHalstead)showingtransitionextendingover60%ofthebladechord,andestimatesofpotentialimprovementinefficiencybyseveralpercentagepoints;consideringhowwidelyturbomachinesareusedinenergyconversionandpropulsionsystems,significanteconomicandenvironmentalbenefitsarepossible.Itisfoundoutth
6、atthe‘lackofabilitytopredictthelocationofboundarylayertransitionforcomponentsingasturbineenginesisimpedingourabilitytogainmaximumbenefitfromourdesigneffort.Ifacompletecomputationalfluiddynamics(CFD)designtoolincorporatingtransitionweretobeavailable,itisforeseenairfoildesignswithhig
7、herbladeloadingthatwouldreducepartcountandimproveefficiency.Itisestimatedthata1%improvementintheefficiencyofalowpressureturbinewouldresultinasavingof$52,000peryearonatypicalairliner.Improvedtransitiontechnologywasthusveryrelevant.Sokeepinginmindsuchimportantissueliketransitionpheno
8、menaindesignandoperationof
