多段喷射对低速二冲程船舶柴油机燃烧与排放的影响  

Effects of Multiple Injection on the Combustion and Emissions of Marine Low-speed Two-stroke Diesel Engine

作　　者：冀雯霞 李昂[1] 朱磊[1] 吕兴才[1] 黄震[1] Ji Wenxia;Li Ang;Zhu Lei;LüXingcai;Huang Zhen(Key Laboratory for Power Machinery and Engineering of Ministry of Education,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学动力机械与工程教育部重点实验室,上海200240

出　　处：《燃烧科学与技术》2020年第2期139-145,共7页Journal of Combustion Science and Technology

基　　金：国家重点研发计划资助项目(2016YFC0205100);高技术船舶科研计划资助项目(MC-201501-D01-03)。

摘　　要：使用CONVERGE2.3对一台EX340EF-UA二冲程船机建立了三维模型,通过数值模拟研究了75%负荷工况时多段喷射对船机燃烧与排放的影响.模拟结果与实验数据有较好的吻合.模拟结果显示,顺序喷射使NO_x排放减少,燃油消耗率略有增加,碳烟排放随着顺序喷射间隔的增大而增大.小主预喷间隔匹配合适的预喷率易获得较低的NO_x排放,大主预喷间隔匹配合适的预喷率易获得较低的燃油消耗率.采取合适的主预喷间隔和预喷量可以实现NO_x排放和燃油消耗率的同时降低.The performance of an EX340EF-UA marine two-stroke diesel engine was simulated by CFD software CONVERGE 2.3.The effects of multiple injection on the combustion and emissions of the marine engine under 75%load were investigated.The simulation results were in good agreement with the experimental data.The results show that sequential injection reduced NOx emissions and increased fuel consumption slightly.Soot emission increased with the increase of sequential injection interval.Low NOx emissions can be easily obtained by matching appropriate pre-injection rate with small main and pre-injection interval,while low fuel consumption can be easily obtained by matching appropriate pre-injection rate with large main and pre-injection interval.The NOx emissions and fuel consumption can be reduced simultaneously by adopting appropriate main and pre-injection interval and pre-injection rate.

关 键 词：顺序喷射 预喷射 低速二冲程船机 燃烧 排放 

分 类 号：TK422[动力工程及工程热物理—动力机械及工程]