第44卷第3期2023年6月Vol.44No.3June2023内燃机工程ChineseInternalCombustionEngineEngineeringCO2/O2环境对柴油着火及燃烧特性的影响万源1，刘永峰1，毕贵军2，刘海峰3，张璐1（1.北京建筑大学机电与车辆工程学院，北京102627；2.新加坡科技研究局制造技术研究院，新加坡637662新加坡；3.天津大学内燃机燃烧学国家重点实验室，天津300072）EffectsofCO2/O2EnvironmentonIgnitionandCombustionCharacteristicsofDieselWANYuan1，LIUYongfeng1，BIGuijun2，LIUHaifeng3，ZHANGLu1（1.SchoolofMechanical-ElectronicandVehicleEngineering，BeijingUniversityofCivilEngineeringandArchitecture，Beijing102627，China；2.SingaporeInstituteofManufacturingTechnology，A*Star，Singapore637662，Singapore；3.StateKeyLaboratoryofEngines，TianjinUniversity，Tianjin300072，China）Abstract：InordertoinvestigatetheeffectofCO2/O2environmentontheignitionandcombustioncharacteristicsofdieselfuel，usingn-heptaneasthedieselsurrogatefuel，theignitionandcombustionprocessofn-heptaneunderdifferentCO2/O2environmentswerecalculatedbasedonthecomputationalfluiddynamicssoftwareCONVERGE.Theopticalconstantvolumecombustionchamberwasestablishedtovalidatethemodel，andthenatureflameluminosityofn-heptanecombustionwasrecordedbyhigh-speedcamera.Theinitialtemperaturewas850K，theinitialpressurewas3MPa，andtheCO2volumefractionswere35%，40%，50%and60%.ThereactionpathofimportantradicalswascalculatedbytheclosedhomogeneousreactorinCHEMKINtoanalyzethephysicalandchemicaleffectofCO2onignition.Theresultsshowthat，deflagrationexistsat35%CO2volumefraction.AstheCO2volumefractionincreases，theignitiondelaytimeincreases，theignitionpositionisfurtherawayfromthenozzle，andlengthandwidthofthesteady-stateflamealsoincreases.ThepeakintensityofnatureflameluminositydecreasessignificantlywhentheCO2volumefractionisbetween50%and60%.ThephysicaleffectofCO2suppressestheignition，andthechemicaleffectofCO2promotestheignitionduetothepromotionofignitionbythirdbodyeffectthantheinhibitionofignitionbydirectchemicaleffect，andthechemicaleffectisstrengthenedwiththeincreaseofCO2volumefrac...
