进气门晚关米勒循环对柴油机燃烧和排放影响的研究  

Research on Effect of Late Intake Valve Closing Miller Cycle on Combustion and Emissions of Diesel Engine

作　　者：魏胜利[1] 刘鑫[1] 冷先银[2] 梁昱[3] 纪坤鹏 王飞虎[1] 

机构地区：[1]江苏大学汽车与交通工程学院,江苏镇江212013 [2]江苏大学能源研究院,江苏镇江212013 [3]贵阳学院机械工程学院,贵州贵阳550005

出　　处：《兵工学报》2015年第8期1384-1390,共7页Acta Armamentarii

基　　金：国家自然科学基金项目(51106065;51366002)

摘　　要：基于D6114柴油机的BOOST模型,分析了进气门晚关米勒循环对柴油机燃烧和排放的影响。结果表明:推迟进气门关闭时刻可以减小压缩阶段的压力和温度,从而使滞燃期增长;但是由于缸内工质的减少,缸内平均温度和碳烟排放升高;增压压力的提高可以弥补进气损失,研究发现进气门晚关结合提高增压压力及推迟喷油,可同时降低NOx和碳烟的排放;在保持爆发压力与原机相同时,采用米勒循环度M60、喷油正时推迟2°CA的方案,油耗降低4 g/(k W·h),碳烟排放降低6%,而NOx的排放量降低了31%.The effect of late intake valve closing （LIVC） Miller cycle on combustion and emissions of D6114 diesel engine is analyzed based on a BOOST model. The results show that the closing time of intake valve can be delayed to decrease the compression pressure and the temperature, thus increasing the ignition delay period. Due to lacking of oxygen, the average in-cylinder temperature and soot emission increase. The boost ratio can be enhanced to compensate the loss of intake. It is also found that the late closing of LIVC, in conjunction with the increase in boost pressure and the delay of injecting time, can simultaneously reduce NO, and soot emission. When the peak pressure is the same as that in the original engine, the fuel consumption is 4 g/（kW.h） lower than that the original engine, the soot emissions are reduced by 6% , and NO, emissions are reduced by 31% by using the scheme of M60 and 2°CA of injecting time.

关 键 词：动力机械工程 D6114柴油机 米勒循环 NOX排放 燃油经济性 

分 类 号：TK42[动力工程及工程热物理—动力机械及工程]