大气氧和燃料氧对高压共轨柴油机燃烧和排放的影响  

Effect of Atmospheric Oxygen Content and Oxygenated Fuel on Combustionand Emission of High-Pressure Common-Rail Diesel Engines

作　　者：刘少华[1] 杨顺堃 申立中[1] 毕玉华[1] 雷基林[1] LIU Shaohua;YANG Shunkun;SHEN Lizhong;BI Yuhua;LEI Jilin(Yunnan Provinee Key laboratory of Intenal Combustion Engines,Kunming University df Science and Technoloe,Kunming 650500,China)

机构地区：[1]昆明理工大学云南省内燃机重点实验室,云南昆明650500

出　　处：《昆明理工大学学报（自然科学版）》2023年第4期64-73,152,共11页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(52066008);云南省教育厅科学研究基金项目(2021J0057);云南省科技厅科技计划项目(2018FA030)。

摘　　要：随着海拔高度的增加,柴油机进气压力和进气含氧量降低.当柴油机燃用含氧燃料(比如乙醇和生物柴油)时,燃烧过程中的氧也可能会发生变化.为了区分大气含氧量和燃料含氧量对柴油机燃烧和排放的差异性影响,在一台高压共轨柴油机上分别燃用纯柴油和含氧量为2.6%、3.2%和4.2%的生物柴油-乙醇-柴油(简称BED)混合燃料,在81、90和100 kPa下,分别进行对比试验研究.试验结果表明,随着大气含氧量的增加,燃烧压力、温度、放热率和燃烧速度均增加;随着BED燃料含氧量的增加,燃烧压力、温度、放热率呈现先降低后升高的趋势,但均低于燃用纯柴油时的情况.随着大气含氧量的增加,柴油机的CO、NO_(x)、HC和PM排放呈现下降趋势;燃用含氧燃料后,柴油机的CO、HC和PM排放下降,随着BED含氧量的增加,呈现先减少后增加的趋势.NO_(x)排放随着BED含氧量的增加而增加.燃料含氧量的增加相比于大气含氧量的增加,对柴油机的CO、HC,PM排放的降低幅度更大,影响作用更为显著.As altitude increases,the intake pressure and oxygen content decrease in diesel engines.When oxy-genated fuels such as ethanol and biodiesel are used,the available oxygen content in the combustion processchanges.To differentiate the effects of atmospheric and fuel oxygen content on combustion and emissions indiesel engines,experiments were conducted using a high-pressure common-rail diesel engine fueled with purediesel and biodiesel-ethanol-diesel(BED)blends with oxygen contents of 2.6%,3.2%,and 4.2%at difer-ent atmospheric pressures of 81,90,and 100 kPa.Test results indicate that combustion pressure,temperature,heat release rate,and combustion speed increase with increasing atmospheric oxygen content.The fist three pa-rameters decrease and then increase with increasing BED fuel oxygen content,but they are always lower thanthose of pure diesel.Increasing atmospheric oxygen content reduces CO,NO_(x),HC,and PM emissions.When u-sing oxygenated fuel,CO,HC,and PM emissions from the diesel engine decrease.As the BED oxygen content in-creases,these emissions show a decreasing trend fllowed by an increasing trend,while NO_(x)emissions increase.When comparing the two technologies on a percentage basis,an increased percentage of BED oxygen content is more effective in reducing CO,HC,and PM emissions than the atmospheric oxygen content.

关 键 词：大气含氧量 含氧燃料 燃烧 排放 高压共轨柴油机 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]