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1、AnalysisonCommonRaildieselenginecombustionprocessbyopticaldiagnosticsS.S.MerolaandB.M.VagliecoIstitutoMotori-CNR,Napoli-ItalyABSTRACTThispaperreviewsanumberofrecentinvestigationsinCommonRaildieselpassengercarenginesusingexamplesfromrelevantresearchinvestigationsalread
2、yperformedorpresentlyinprogressattheFluid-dynamic,CombustionandFuelCellforPropulsionDivisionofIstitutoMotoriusingopticaldiagnostictechniques.Thepaperdiscussesdieselcombustionfundamentalprocessesintermsofthein-cylinderflow,sprays,combustionandemissions.Emphasisisplaced
3、oncombustionsystemsandspectroscopytechniquesabletoanalysetheprocessesthatcontrolengine-outemissionsandfuelconsumption.Keywords:dieselengine,commonrail,opticaldiagnostics,combustionprocess.INTRODUCTIONdifficultyinstudyofphysicalandchemicalprocessesinvolvedopticaldiagno
4、stictechniquesareparticularlyAspredictedinthepast,thedieselengineuseful.Intheselastyears,theavailabilityofpenetrationhaslargelypassedthe40%shareofthetransparentengines,comparablewithproductionEuropeanmarketofpassengercarsanditiseasytoengines,haveallowedvaluableinforma
5、tionuntilnowpredictafurthergrowthinthenextyearsuptoaroundaboutfuelspraydistributionandevaporation,mixture50%.preparation,auto-ignition,spatialdistributionofkeyThisgreatsuccessiscertainlyduetothelate90s’transientspecies,and,finally,pollutantformation.[8,availabilityoft
6、echnologybreakthroughforthefuel9]deliverysystem,asCommonRail(CR)andunitInthispaper,CRdieselprocessesfromfuelinjector,whichhaveledtoenhancethedirectdieselinjectiontoexhaustphasewereanalysedbycombinedenginepotentialintermoffueleconomyandfuntoopticalmeasurements.Theywere
7、basedon2Ddigitaldrivegrantingasuperiorcontrolofemission,noiseimagingandspectroscopictechniquesuchasvibrationandhardness,thetraditionalweakpointsofUltraviolet(UV)tovisiblescatteringextinctionandthesolution.[1,2,3]absorptionandflameemissionmeasurements.However,thediesel
8、enginechallengecontinuesinTheseinvestigationswerecarriedoutonthreethenextfuturewiththemandatorystepofthegasolinedieselresear