2000 some aspects of modeling compressor behavior in gas turbine performance calculations

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1、SomeAspectsofModelingCompressorBehaviorinGasTurbinePerformanceCalculationsClausRieglerPerformancecalculationproceduresforgasturbineenginesareusuallybasedontheperformancecharacteristicsoftheenginecomponents,andespeciallytheturbocompo-MichaelBauernents

2、areofmajorinterest.Inthispapermethodsofmodellingcompressorsingasturbineperformancecalculationsarediscussed.ThebasicmethodologiesbasedonMachnumberJoachimKurzkesimilarityaresummarizedbrie¯yincludingsomesecondordereffects.Underextremeenginepartloadcondi

3、tions,asforexamplesubidleorwindmilling,theoperatingpointsinEnginePerformanceDepartment,thecompressormaparelocatedinaregionwhichisusuallynotcoveredbyrigtests.InMTUMuÈnchenGmbH,additiontheparametersusuallyusedincompressormapsarenolongerappropriate.ForD

4、aimlerChryslerAerospace,theseoperatingconditionsamethodispresentedtoextrapolatecompressormapstowards80995MuÈnchen,Germanyverylowspoolspeeddowntothelockedrotor.Insteadoftheef®ciencymoreappropriateparametersasforexamplespeci®cworkorspeci®ctorquearesugg

5、ested.Acompressormappreparedwiththeproposedmethodsispresentedanddiscussed.Asanotherrelevanttopictheperformancemodellingoffansforlowbypassratioturbofansiscovered.Duetothe¯owsplitterdownstreamofsuchafanthecoreandbypassstreammaybethrottledindependentlyd

6、uringengineoperationandbypassratiobecomesathirdindependentparameterinthemap.Becausetestingafanontherigforvariousbypassratiosisaverycostlytask,asimpli®edmethodhasbeendevelopedwhichaccountsfortheeffectsofbypassratio.@DOI:10.1115/1.1368123#1Introduction

7、inacompressormapÐandalsotosetunambiguouslyanoperatingpointonatestrigÐtwoindependentparametersarenecessarytoInmostperformancecalculationprogramstheoff-designbe-de®netherotationalMachnumberofthebladesandthe¯owhaviorofcompressorsismodelledwiththehelpofs

8、o-calledmapsMachnumber.orcharacteristics,whichpresentthecorrelationsbetweenthemainTheconventionalmapresultingfromthisisusuallyaplotofcompressorperformanceparameters.Themapshavetocovertotalpressureratioversuscorrected¯ow~representing¯owMachphysicalasp