空燃比对准均质充量压缩点燃天然气发动机低负荷排放性能的影响  

Effect of Air/CNG Equivalence Ratio on Emissions and Performances of CNG Engine Operating on QHCCI Mode at Low Loads

作　　者：苏岭[1] 周龙保[1] 汪映[1] 蒋德明[1] 李维[1] 钟辉[1] 

机构地区：[1]西安交通大学能源与动力工程学院

出　　处：《兵工学报》2006年第5期895-898,共4页Acta Armamentarii

摘　　要：通过采用进气节流改变空气/天然气过量空气系统a,实验研究了a对准均质充量压缩点燃(QHCCI)天然气发动机的低负荷排放性能的影响。研究结果表明:在低负荷工况下,a太小,将会导致NOx排放增加,热效率下降;a过大,将会导致HC、CO排放的增加。通过对a进行优化控制,大大降低了低负荷工况下HC和CO排放。Using intake throttling to change excess air/CNG ratio Фa, experimental study on the effect of excess air/CNG ratio Фa on the thermal efficiency and emissions of the CNG engine operating on quasi-homogeneous charge compression ignition （QHCCI） mode at low loads was carried out. The results show that when CNG engine operates on QHCCI mode at low loads, too small Фa causes the increase in NOx emission and the decrease in thermal efficiency, while too large Фa leads to the increase in CO and HC emissions. HC and CO emissions are reduced remarkably by optimizing Фa.

关 键 词：动力机械工程 QHCCI发动机 过量空气系数 低负荷 排放 

分 类 号：TK42[动力工程及工程热物理—动力机械及工程]