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增压直喷汽油机超级爆震发生机理以及爆震抑制的试验研究.docx

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增压直喷汽油机超级爆震发生机理以及爆震抑制的试验研究 Title:MechanismofKnockinTurbochargedDirectInjectionGasolineEnginesandExperimentalResearchonKnockSuppression Abstract: Thispaperinvestigatesthephenomenonofknock,alsoknownassuper-knockormega-knock,inturbochargeddirectinjection(TDI)gasolineengines.Knockreferstoanabnormalcombustionprocessthatcausesasharpincreaseinpressureandtemperaturewithinthecombustionchamber,leadingtodetrimentaleffectsonengineperformanceanddurability.TheprimaryobjectiveofthisstudyistoelucidatethemechanismofknockoccurrenceandprovideinsightsintotheexperimentalresearchconductedtosuppressknockinTDIgasolineengines. Keywords:knock,super-knock,mega-knock,turbochargeddirectinjection,gasolineengine 1.Introduction Knockingasolineengineshasremainedapersistentchallengeforengineresearchersduetoitsdetrimentaleffectsonengineperformance,fueleconomy,andemissions.Theemergenceofturbochargeddirectinjection(TDI)gasolineengineshasfurtherintensifiedtheoccurrenceofknock.ThispaperaimstoaddressthemechanismofknockinTDIenginesandhighlightexperimentalresearchconductedtomitigateknock. 2.MechanismofKnockinTDIGasolineEngines 2.1.ChemicalReactions Knockisprimarilycausedbytheautoignitionoftheunburnedmixtureaheadoftheflamefront.Thisprematureignitionoccursduetohigh-pressureandhigh-temperatureregionswithinthecombustionchamber,leadingtotheformationofpressurewavesthatresultinaknockingsound.Thepresenceoflow-speedpre-ignition(LSPI)eventsfurtherexacerbatesknockoccurrenceinTDIengines. 2.2.AutoignitionandPressureRiseRates Theoccurrenceofknockisinfluencedbyfactorssuchastheair-fuelratio,sparktiming,compressionratio,andcylinderpressure.Highcompressionratioscanincreasethelikelihoodofknockduetothehighertemperaturesandpressureswithinthecombustionchamber.Thepresenceofaturbochargercanfurtherintensifyknockbyincreasingthein-cylinderpressureandtemperature. 3.ExperimentalResearchonKnockSuppressioninTDIGasolineEngines 3.1.SparkTimingOptimization Oneofthekeymethodsforknocksuppressionisoptimizingsparktiming.Advancingorretardingthes