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平壁气膜冷却的数值模拟.docx

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平壁气膜冷却的数值模拟 Abstract Airfilmcoolingisaneffectivemethodtoprotectthesurfaceofhigh-temperaturecomponentsingasturbineengines.Inthispaper,anumericalsimulationoftheflatwallairfilmcoolingwascarriedoutusingthecommercialsoftwarepackageANSYSFluent.Thestudyaimedtoinvestigatetheheattransfercharacteristicsandflowfieldofthecoolingairfilm.ThesimulationwasbasedontheReynolds-averagedNavier-Stokesequations,usingtheSSTk-ωturbulencemodel.Theresultsshowedthatthecoolingeffectivenessincreasedwiththeincreaseoftheblowingratio,whilethefilmcoolingefficiencydecreased.Thefilmcoolingperformancewasalsofoundtobeaffectedbytheinjectionholeconfiguration.Thestudyprovidedvaluableinsightsintothedesignandoptimizationofairfilmcoolingsystemsforgasturbineengines. Introduction Ingasturbineengines,high-temperaturecomponentssuchasturbinebladesandcombustorlinersaresubjectedtoharshthermalloads.ThesurfacetemperatureofthesecomponentscanreachseveralhundreddegreesCelsius,whichcanleadtoseverethermalstressanddamage.Efficientcoolingofthecomponentsisthereforenecessarytoprotectthemfromthermaldamageandincreasetheirservicelife. Airfilmcoolingisawidelyusedmethodtocoolthehotsurfacesofgasturbinecomponents.Inairfilmcooling,athinlayerofcoolairisinjectedoverthesurfacetoformaboundarylayerthatreducesthesurfacetemperature.Theinjectedairformsaninsulatinglayer,whichreducestheheattransferfromthesurfacetothesurroundingfluid.Thecoolingaircanbeinjectedthroughaseriesofsmallholes,whicharetypicallyarrangedinaspecificpatternoverthesurface. Theperformanceofairfilmcoolingdependsonseveralfactors,includingtheblowingratio,theinjectionholeconfiguration,andthesurfacegeometry.Theblowingratioisdefinedastheratioofthemassflowrateofthecoolingairtothemassflowrateoftheworkingfluid.Theinjectionholeconfigurationreferstothearrangement,size,andshapeoftheholesonthesurface.Thesurfacegeometryalsoplaysaroleindeterminingtheeffectivenessofthecooling,asitaffectstheflowfieldandthedistributionofthecoolingair. Inthisstudy,anumericalsimulationoftheflatwallairfilmcooling