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EGR中主要组分对正庚烷燃烧与排放影响的化学动力学研究.docx

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EGR中主要组分对正庚烷燃烧与排放影响的化学动力学研究 Title:ChemicalKineticStudyontheEffectsofMajorComponentsinEGRonn-HeptaneCombustionandEmissions Abstract: Withtheincreasingconcernsoverairpollutionandgreenhousegasemissions,theuseofexhaustgasrecirculation(EGR)hasbecomeaneffectivestrategytoreducenitrogenoxide(NOx)emissionsininternalcombustionengines.EGRinvolvesintroducingaportionoftheexhaustgasesbackintothecombustionchamber,alteringthecompositionoftheintakemixture.ThispaperfocusesonthechemicalkineticstudyoftheeffectsofmajorcomponentsinEGRonthecombustionandemissionsofn-heptane,animportantsurrogateforgasoline. Introduction: Thecombustionoffuelsintheinternalcombustionengineisacomplexprocessinvolvingaseriesofchemicalreactions.ThepresenceofEGRhasbeenfoundtohaveasignificantimpactonthecombustionprocessand,consequently,ontheformationofnitrogenoxides,carbonmonoxide,andunburnedhydrocarbons.Inthisstudy,weinvestigatethechemicalkineticmechanismsandrelativeimpactsofthemajorcomponentsinEGRonthecombustionandemissionsofn-heptane,contributingtoabetterunderstandingoftheEGRsystem'sroleinemissionreductionstrategies. Methodology: Thestudyisconductedthroughacombinationofexperimentalmeasurementsandcomputationalsimulations.Anexperimentalsetupisdesignedtosimulatetheconditionsinaninternalcombustionengine,includingtheuseofaconstant-volumecombustionchamber,intakeandexhaustsystems,andadvanceddiagnostictechniques.ThecompositionandconcentrationofEGRcomponentsarecarefullycontrolledtoinvestigatetheireffectsonthecombustionandemissionsofn-heptane.ComputationalsimulationsusingchemicalkineticmodelswillbeperformedtogaindeeperinsightsintotheunderlyingmechanismsandpredictthebehaviorofdifferentEGRfuelmixtures. ResultsandFindings: PreliminaryresultsindicatethatthepresenceofEGRmajorcomponents,suchasnitrogen,carbondioxide,andwatervapor,significantlyaffectstheignitiondelayandcombustioncharacteristicsofn-heptane.ThedilutioneffectofEGRleadstoadecreaseinthepeaktemperature,resultinginaslowerreactionrateandlongerignitiondelay.Additionally,ni