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时间:2020-03-25
《氢气直喷与EGR协同作用对汽油机燃烧和排放的影响研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、2016年(第38卷)第9期汽车工程AutomotiveEngineering2016(V01.38)No.92016164氢气直喷与EGR协同作用对汽油机燃烧和排放的影响研究木于秀敏,吴海明,杜耀东,刘林,牛仁旭,董伟(吉林大学,汽车仿真与控制国家重点实验室,长春130022)[摘要]为揭示氢气对传统燃料燃烧的改善作用,在一台加装EGR的氢气缸内直喷、汽油进气道喷射的复合喷射火花点火双燃料发动机上,开展了不同掺氢比和EGR率下发动机性能和排放的试验研究:结果表明:EGR的引入会降低发动机转矩,而掺氢可有效提高
2、发动机转矩。有效燃油消耗率随着EGR率的增大呈现先减小后增加的趋势,掺氯可降低有效燃油消耗率,改善发动机经济性:缸压峰值随EGR率的增加呈现先增大后减小的趋势,其对应的时刻推迟;随着掺氯比的增加缸压峰值增大,且出现的时刻提前。平均指示压力循环变动系数随EGR率的增加而增大,掺氢叮有效降低燃烧循环变动。汽油掺氢后NO。排放增加,EGR的引入能有效降低NO,排放,这种降低效果在大掺氢比下更显著;HC和CO排放随EGR率增大而增加,随掺氧比的增加而降低在氯气缸内直喷与EGR协同作用下,发动机可获得较好的综合性能。关键
3、词:汽油机;氢气直喷;废气再循环;燃烧;排放AStudyontheCollaborationEffectsofHydrogenDirect—injectionandEGRontheCombustionandEmissionsofGasolineEngineYuXiumin,WuHaiming,DuYaodong,LiuLin,NiuRenxu&DongWeiJilinUnit’ersit),StateKe)l』tborator)ofAutomotit’eSimulation.ridControl,Changr’
4、hun130022[Abstract]Fm’revealingtheimprovementeffectsofhydrogenonthecombustionoftraditionalfuel,anex-perimentalstudyontheperformanceandemissionofacompoundfuelinjectionspark-ignitiondual·fuelengine(hy-drogenin—cylinderdirectinjectionandgasolineportinjection)wi
5、thexhaustgasreeir(·ulation(EGR)deviceunderdifferenthydrogenfractionsandEGRrates.TheresultsindicatethattheintroductionofEGRreducesenginetorqueandhydrogenadditioncaneffectivelyincreaseenginetorque.Effectivespecificfuelconsumptionshowsatrendofdeducingfirsttheni
6、ncreasingwiththeriseofEGRrate,butcanbeloweredbyhydrogenadditionwiththefuelecon.omyofengineimproved.WiththeincreaseofEGRrate,cylinderpressurepeakrisesfirstthenfalls,withcorre—spondingtimingretards.Thecyclicvariationcoefficientofmeanindictedpl’essureriseswitht
7、heincreaseofEGRrate,butcanbeeffectivelyloweredbyhydrogenaddition.Withhydrogenaddedintogasoline,theemissionofNO。increases,butwhichcanbeeffectivelyloweredbytheintroductionofEGR,beingmoreapparentinlargehydrogenfraction.TheemissionsofHCandCOincreasewiththeriseof
8、EGRbutdecreasewithhydrogenfraction.Tosumup,underthecollaborationofEGRandhydrogenin—cylinderdirectinjection,theenginecanachievebetteroverallperformance.Keywords:gasolineengine;hydrogendirect-inje
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