GasTurb13UseOfMaps

COMPONENTMAPSGasTurb13Copyright©GasTurbGmbHGasTurb12MainWindowForthistutorialwewilluseasimpleTurbojetCopyright©GasTurbGmbHWeNeedSomeDataCopyright©GasTurbGmbHSelecttheenginemodelOpentheenginemodelOff-DesignInputDataPageCopyright©GasTurbGmbHRunanOff-DesignsimulationwithoutchangesOff-DesignPointSummaryCopyright©GasTurbGmbHHavealockatthecompressormapThisisthecycledesignpoint,calculatedinoff-designmode.StandardCompressorMapInthisspecialcase–becausewehavecalculatedthecycledesignpointinoff-designmode–theyellowsquareisinsidethecircle.Copyright©GasTurbGmbHClosetheresultwindowThecirclemarksthecycledesignpoint,theyellowsquaremarkstheoff-designoperatingpoint.ThecycledesignpointisMassFlowW2RStd=32kg/sPressureRatio=12Efficiency=0.85W2RStd=MassFlowCorrectedtoStandardDayConditionsOff-DesignInputDataPageCopyright©GasTurbGmbHClickonSpecialtoconfigureSpecialMapsTheStandardMapsyieldinmanycasesreasonabletrends.However,foraccuratesimulationstheStandardMapsmustbereplacedbySpecialMaps.HPCompressorMapCopyright©GasTurbGmbHInthiswindowyoucanreadtheappropriatecompressormapfromfile.Toshortenthetutorialwedonotreadaspecialmap,westaywiththedefaultmap.Attheyellowsquarethepressureratiointhemapis8.3138.Toscalethemapinsuchawaythatitfitstothecycledesignpoint(P/P=12)thefactorfP/P-1=1.504isapplied:1/*1/1/mapPPscaledPPfPPAttheyellowsquaretheefficiencyinthemapis0.86015.Toscalethemapinsuchawaythatitfitstothecycledesignpoint(=0.85)thefactorsf=0.9884andfReynolds=0.9998areapplied:mapynoldsscaledff**RePeakEfficiencyisthehighestefficiencyfoundinthescaledmap.Thecoordinatesofthedesignpointinthemap(theyellowsquare)areBeta,ds=0.5andN/sqrt(T),ds=1Theyellowsquaremarksthecycledesignpoint.Youcaneithereditthecoordinatesofthedesignpointormovethedesignpointwiththemouse:clickit,keepthebuttonpressed,moveit.WewillsetthecycledesignpointnowtoBeta,ds=0.4N/sqrt(T),ds=1.05MapScalingCopyright©GasTurbGmbHAttheyellowsquaretheefficiencyinthemapisnow0.8246.Toscalethemapinsuchawaythatitfitstothecycledesignpoint(=0.85)thefactorsf=1.03andfReynolds=0.9998areapplied:mapynoldsscaledff**RePeakEfficiencyisthehighestefficiencyfoundinthescaledmap.Previouslyitwas0.8568,nowitis0.8929.Thereasonforthatis:thecycledesignpointefficiencyremainsalways0.85ClosethemapwindowSavethedataasEngineModelCopyright©GasTurbGmbHClickonOperatingLineThedatacanonlybestoredasEngineModelFileifalldataontheSteadyStatepageareidenticaltothosefromthecycledesignpointandifalltheModifiersarezero.AnEngineModelFilecontainsinadditiontoanormaldatafileinformationaboutthecomponentmapsandhowtheyarescaled.Nextwerunasingleoperatinglinewiththedefaultsettings.Off-DesignInputDataPageCopyright©GasTurbGmbHRuntheOperatingLineSelectNoSelectComprCompressorMapNewCopyright©GasTurbGmbHThespeedlinepassingthroughthecycledesignpointhastherelativecorrectedspeedvalueof1.Thenumbersattheotherspeedlinesarethosefromtheun-scaledmap,dividedbyN/sqrt(T),ds=1.05PeakEfficiencyisthehighestefficiencyfoundinthemap,itis0.8929.IfwewouldusetheStandardMapwiththedefaultsettingofthecycledesignpoint(i.e.Beta,ds=0.5andN/sqrt(T),ds=1),thentheoperatinglineinthecompressormapwouldlookasinthenextslide.CompressorMapOldCopyright©GasTurbGmbHThespeedlinepassingthroughthecycledesignpointhastherelativecorrectedspeedvalueof1.PeakEfficiencyisthehighestefficiencyfoundinthemap,hereitis0.8568.EffectofMapScalingonSFCCopyright©GasTurbGmbHStandardMapScaledWiththeDefaultDesignPointCoordinatesBeta,ds=0.5andN/sqrt(T),ds=1StandardMapScaledWiththeSpecialDesignPointCoordinatesBeta,ds=0.4andN/sqrt(T),ds=1.05Thisisthecycledesignpointwherebothoperatinglinesagree.Hint:ThisslideismadeoftwopictureswhichwerecopiedtotheclipboardfromGasTurbandthenpastedintoPowerPoint.ComparingMeasuredDataWithGasTurbCopyright©GasTurbGmbHAndrunanotherOperatinglineSwitchbacktoStandardmapsReadTestDataCopyright©GasTurbGmbHReadthefiledemo_jet.tstReadafilewithmeasureddataClickOpenRuntheOperatingLineSelectNoMakingtheComparativeDataVisibleCopyright©GasTurbGmbHCheckShowTestDataClickPlotComparingSFCCopyright©GasTurbGmbHSimulationMeasureddataClickonNewPictureandplottheisentropiccompressorefficiencyoverthecorrectedcompressorflowComparingCompressorEfficiencyCopyright©GasTurbGmbHClickonEditComprMapMeasuredcompressorefficiencyishigherthaninthesimulation.ForimprovingtheagreementwegoforeditingtheHPCMap.TheCompressorMapEditorCopyright©GasTurbGmbHWewillnowusetheslidertomakethelinespassthroughthemiddleofthedatapoints.ThislineshowsthepeakefficiencyoneachspeedlineThislineshowstheefficiencyforbeta=0.5ThesearethemeasuredefficiencydatapointsAlternativelytousingtheslideryoucouldeditthepeakefficiencyvaluesinthiscolumnClickonSpeedtomodifythespeed-massflowcorrelationTheCompressorMapEditorCopyright©GasTurbGmbHSimilarlywecanaffecttheSpeed-MassFlowcorrelationbyre-labelingthespeedlinesinthemap.ThenewcompressormapshouldbesavedafterclosingthemapeditorTheSimulationAgreeswiththeMeasurementsCopyright©GasTurbGmbHAftersomeexperimentswitheditingthemapwegetareasonableline-upbetweenthemeasureddataandthesimulation.ThisslideendstheComponentMap