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1、SomeAspectsofModelingCompressorBehaviorinGasTurbinePerformanceCalculationsClausRieglerPerformancecalculationproceduresforgasturbineenginesareusuallybasedontheperformancecharacteristicsoftheenginecomponents,andespeciallytheturbocompo-MichaelBauernents
2、areofmajorinterest.Inthispapermethodsofmodellingcompressorsingasturbineperformancecalculationsarediscussed.ThebasicmethodologiesbasedonMachnumberJoachimKurzkesimilarityaresummarizedbrieˉyincludingsomesecondordereffects.Underextremeenginepartloadcondi
3、tions,asforexamplesubidleorwindmilling,theoperatingpointsinEnginePerformanceDepartment,thecompressormaparelocatedinaregionwhichisusuallynotcoveredbyrigtests.InMTUMuènchenGmbH,additiontheparametersusuallyusedincompressormapsarenolongerappropriate.ForD
4、aimlerChryslerAerospace,theseoperatingconditionsamethodispresentedtoextrapolatecompressormapstowards80995Muènchen,Germanyverylowspoolspeeddowntothelockedrotor.Insteadoftheef?ciencymoreappropriateparametersasforexamplespeci?cworkorspeci?ctorquearesugg
5、ested.Acompressormappreparedwiththeproposedmethodsispresentedanddiscussed.Asanotherrelevanttopictheperformancemodellingoffansforlowbypassratioturbofansiscovered.Duetotheˉowsplitterdownstreamofsuchafanthecoreandbypassstreammaybethrottledindependentlyd
6、uringengineoperationandbypassratiobecomesathirdindependentparameterinthemap.Becausetestingafanontherigforvariousbypassratiosisaverycostlytask,asimpli?edmethodhasbeendevelopedwhichaccountsfortheeffectsofbypassratio.@DOI:10.1115/1.1368123#1Introduction
7、inacompressormapDandalsotosetunambiguouslyanoperatingpointonatestrigDtwoindependentparametersarenecessarytoInmostperformancecalculationprogramstheoff-designbe-de?netherotationalMachnumberofthebladesandtheˉowhaviorofcompressorsismodelledwiththehelpofs
8、o-calledmapsMachnumber.orcharacteristics,whichpresentthecorrelationsbetweenthemainTheconventionalmapresultingfromthisisusuallyaplotofcompressorperformanceparameters.Themapshavetocovertotalpressureratioversuscorrectedˉow~representingˉowMachphysicalasp
