混合燃烧时汽油含量对发动机燃烧和排放的影响
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摘要
在高压共轨增压中冷压燃式柴油机上加装汽油进气道喷射系统,试验研究汽柴油混合燃烧时汽油的质量分数对发动机燃烧和排放的影响。结果表明:发动机转速为1738 r/min时,随着汽油质量分数的增加,不同负荷下发动机的燃烧呈现不同的趋势,滞燃期变长,燃烧持续期变短,发动机燃烧的等容度和最大压升率增加;随着汽油质量分数的增加,碳烟和NO_x的排放大幅度减少,但是HC和CO的排放大幅升高,需加装柴油氧化催化(diesel oxidation catalyst,DOC)以降低HC和CO的排放。
A gasoline intake port injection system is installed on a high pressure common rail turbocharged and intercooled compression ignition diesel engine to study the effect of gasoline ratio on combustion and emission of the engine when gasoline and diesel are mixed. The experimental results show that when the engine speed is 1738 r/min, under different loads, with the increase of the proportion of gasoline, the combustion of the engine presents different trends, the ignition delay becomes longer, and the combustion duration becomes shorter. At this time, the combustion capacity of the engine increases, and the maximum pressure rise rate of the engine increases. With the increase of the proportion of gasoline, the emission of SOOT and NO_x decreases. However, the emission of HC and CO increases, and DOC is needed to reduce HC and CO emissions.
A gasoline intake port injection system is installed on a high pressure common rail turbocharged and intercooled compression ignition diesel engine to study the effect of gasoline ratio on combustion and emission of the engine when gasoline and diesel are mixed. The experimental results show that when the engine speed is 1738 r/min, under different loads, with the increase of the proportion of gasoline, the combustion of the engine presents different trends, the ignition delay becomes longer, and the combustion duration becomes shorter. At this time, the combustion capacity of the engine increases, and the maximum pressure rise rate of the engine increases. With the increase of the proportion of gasoline, the emission of SOOT and NO_x decreases. However, the emission of HC and CO increases, and DOC is needed to reduce HC and CO emissions.
引文
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[4]王乔,孙万臣,郭亮,等.汽油/柴油混合燃料对压燃式发动机预混燃烧及排放的影响[J].汽车工程,2018,40(11):1267-1274.
[5]孙柯,李思远,杨滨,等.EGR对汽柴油双燃料均质引燃影响的试验探究[J].内燃机与动力装置,2016,33(3):1-5.
[6]李思远,孙柯,杨滨,等.柴油深度混合改善均质引燃排放的试验研究[J].内燃机与动力装置,2018,35(2):32-35.
[7]谢春华,张昊,马帅营.汽油/柴油混合燃料发动机小负荷工况的燃烧及排放特性仿真研究[J].现代车用动力,2017(2):5-12.
[8]史晓刚,李旭聪,康志强,等.汽柴油比例对汽柴油双燃料发动机性能影响的研究[J].小型内燃机与车辆技术,2015,44(2):1-6.
[9]杨柏枫,黄朝霞,刘川,等.双燃料发动机运行参数匹配优化对油耗率的影响[J].集美大学学报(自然科学版),2018,23(6):448-454.
[10]于超.汽油均质混合气柴油引燃低温燃烧的试验研究和模拟计算[D].北京:清华大学,2013.
[11]KOKJOHN S,HANSON R M,SPLITTER D A,et al.Fuel reactivity controlled compression ignition (RCCI):a pathway to controlled high-efficiency clean combustion[J].International Journal of Engine Research,2011,12(3):209-226.
[12]LI Yaopeng,JIA Ming,XIE Maozhao,et al.Numerical study on the combustion and emission characteristics of a methanol/diesel reactivity controlled compression ignition(RCCI) engine[J].Applied Energy,2013(106):184-197.
[13]CHEN J,BHAGATWALA A,SANKARAN R,et al.Numerical investigation of spontaneous flame propagation under RCCI conditions[J].Combustion and Flame,2015,162(9):3412-3426.
[14]SHUAI Shijin,WANG Zhi,YU Chao,et al.Comparative study on gasoline homogeneous charge induced ignition (HCII) by diesel and gasoline/diesel blend fuels (GDBF) combustion[J].Fuel,2013,106:470-477.
[15]TONG Dehui,REN Shuojin,LI Yunqiang,et al.Performance and emissions of gasoline homogeneous charge induced ignition (HCII) by diesel through whole operating range on a heavy-duty multi-cylinder engine[J].Fuel,2017,197:259-271.