点火提前角对CNG发动机燃氢怠速性能的影响  

Effect of Ignition Advance Angle on Idle Performance of Hydrogen Fueled CNG Engine

作　　者：何义团[1,2] 安娜[1] 邓蛟[2] Nashay Naeve 马凡华[2] 

机构地区：[1]重庆交通大学机电与汽车工程学院,重庆400074 [2]清华大学汽车安全与节能国家重点实验室,北京100084

出　　处：《重庆交通大学学报（自然科学版）》2011年第2期311-314,共4页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：重庆市教委科学技术研究项目(KJ100423);重庆市自然基金项目(CSTC;2010BB4264);汽车安全与节能国家重点实验室基金项目(zz2010-062)

摘　　要：为了研究点火提前角θi对CNG发动机燃氢怠速性能的影响,在一台天然气发动机上进行了燃氢怠速性能试验。固定转速800 r/min,过量空气系数λ=2,θi从上止点前20℃A到0℃A变化。结果表明:随着θi减小,火焰发展期减小而快速燃烧期增加。当θi>16℃A,大部分燃料在上止点前燃烧,负功增加,指示热效率低;θi=10℃A左右,指示热效率最高,且排放指标较小。对于燃氢发动机,怠速稀燃工况下,不具备产一定量CO和HC的条件。为了降低燃氢发动机的NOx排放,满足稀燃条件的同时,需要适当减小点火提前角。To study the effect of ignition advance angle（θi） on idle performance of a hydrogen fueled CNG engine,an idle performance test was conducted on a hydrogen fueled CNG engine.The engine speed was fixed at 800r/min;the excess air ratio was set at λ=2 and θi was adjusted from 20℃A BTDC to 0℃A BTDC.The results demonstrated that as θi was reduced,the flame development angle decreased and the rapid combustion period increased.When θi16℃A,most of the fuel was combusted before TDC;the negative power increased and the indicated thermal efficiency was rather low.When θi was around 10℃A,the indicated thermal efficiency reached its top value and the exhaust emissions were rather low.To a hydrogen fueled engine,the combustion conditions were not enough to produce certain amount of CO and HC under conditions of idle and lean burning;θi should be reduced properly to reduce NOx emissions.

关 键 词：CNG发动机 氢气 点火提前角 怠速性能 

分 类 号：U464.174[机械工程—车辆工程] TK464[交通运输工程—载运工具运用工程]