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1、CombustionandFlame133(2003)467–481AreducedchemicalkineticmodelforHCCIcombustionofprimaryreferencefuelsinarapidcompressionmachineShigeyukiTanaka*,FerranAyala,JamesC.KeckSloanAutomotiveLaboratory,MassachusettsInstituteofTechnology,Cambridge,MA02139Received
2、2August2002;receivedinrevisedform13February2003;accepted20February2003AbstractAmodelfortheHomogeneousChargeCompressionIgnition(HCCI)ofPrimaryReferenceFuels(PRFs)inaRapidCompressionMachine(RCM)hasbeendeveloped.Areducedchemicalkineticmodelthatincluded32spe
3、ciesand55reactionswasusedandtheaffectofwallheattransferonthetemperatureoftheadiabaticcoregaswastakenintoaccountbyaddingthedisplacementvolumeofthelaminarboundarylayertothecylindervolume.Asimpleinteractionbetweenn-heptaneandiso-octanewasalsoincluded.Theres
4、ultsshowedthewell-knowntwo-stageignitioncharacteristicsofheavyhydrocarbons,whichinvolvelowandhightemperaturecyclesfollowedbyabranchedchainexplosion.The?rststageenergyreleasedecreasesandtheignitiondelayincreasesnonlinearlywithincreasingoctanenumberanddecr
5、easingtheinitialpressure.TheenergyreleaserateandtotalenergyreleasedweredeterminedprimarilybytherateofCOoxidationduringtheexplosivephasefollowingtheignitiondelay.ThemodelreproducedthepressurecurvesobtainedintheRCMexperimentsoverawiderangeofconditionsremar
6、kablywellandwasverysensitivetothefuelstructure,themixturecompositionandtheinitialtemperatureandpressure.Thus,themodelcanbeeasilyadaptedforpredicting“knock”inspark-ignitionenginesandignition-delaysandburningratesinHCCIengines.?2003TheCombustionInstitute.A
7、llrightsreserved.Keywords:HCCI;Reducedchemistry;Rapidcompressionmachine;PRF;n-heptane;iso-octane1.Introductionbeenremarkablysuccessfulinpredicting“knock”thresholdsinspark-ignitionengines.However,theThehomogeneouschargecompressionignition(HCCI)ofhydrocarb
8、on-airmixtureshasbeenthereducedchemistryusedincludesonlythelowtem-subjectofnumerouspriorexperimentalandtheoret-peraturereactionsrequiredtodescribetheignitionicalinvestigations[1–8].Theseinvestigationsshowprocessandcannotde
