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1、PROCEEDINGSOFECOS2012-THE25THINTERNATIONALCONFERENCEONEEEFFICIENCY,CECCCOST,OOOOPTIMIZATION,SSSSIMULATIONANDENVIRONMENTALIMPACTOFENERGYSYSTEMSJUNE26-29,2012,PERUGIA,ITALYAflexibleandsimpledeviceforin-cylinderflowmeasurements:experimentalandnumericalvalidationabcAndre
2、aDaiZotti,MassimoMasi,MarcoAntonelloaEbaraPumpsEuropeS.p.A.,R&DDept.,Brendola-Vicenza,Italy,Andrea_DaiZotti@ebaraeurope.combUniversityofPadova,Dept.ofManagementandEngineering,Vicenza,Italy,massimo.masi@unipd.itcUniversityofPadova,Padova,Italy,marco.antonello@unipd.it
3、Abstract:Deepknowledgeofintakeprocessaerodynamicsisfundamentaltodevelopmentandoptimisationofmoderninternalcombustionengines.Inparticular,theintakeportflowstronglyaffectsbothvolumetricefficiency,i.e.poweroutput,andin-cylinderchargemotionwhichinfluencescombustionbehavi
4、ourandpollutantsformation.Thepaperpresentsanexperimentalandnumericalstudyofintakeairflowthroughportsandcylinderinafour-valvespent-roofmotorbikehigh-speedengine.Averysimplemechanicaldevicespecificallydesignedforquickandlow-costmeasuresofswirlandtumblemotionsinsteady-s
5、tatedischargeflowcoefficienttestrigswasdevelopedandcheckedontwotwin-cylinderstockproductionheadsfeaturingintakeportsdesigntypicalofmodernmotorbikehighspeedSIengines.Simultaneousmeasuresofdischargeflowandtumblecoefficientsprovedthelimitederrorduetodeviceinsertion.Adet
6、ailedCFDmodelofcylinder,intakeports,andmanifoldswithintheengineheadwasbuildandexperimentallyvalidatedbydischarge-flowcoefficientmeasurementsperformedatdifferentvalvelift.Thesensitivitytogridrefinementandtheperformanceofarealizablek-εandamodifiedk-ωturbulencemodelsisi
7、nvestigated.Thenumericalmodelisusedtoevaluatethereliabilityoftumblemeasurements.ThecorrelationbetweenexperimentaldataandthewholeCFDvelocityfieldwithincylindervolumeisverygoodprovingthatthedeviceappearswell-suitedforrapidandreliableanalysisofaerodynamicbulkperformance
8、ofengineheads.Keywords:Tumblemeasure,Tumbleanddischargeflowcoefficients,in-cylinderflowCFDcalculation,gridandturbulencemodelforinta
