于云飞;葛新阳;许伯彦;李新海;
山东建筑大学机电工程学院
摘要：简化LPG燃烧反应机理模型,将反应机理简化为包含30种组分50个化学反应的机理。将简化的反应机理导入AVL FIRE软件模拟混合气的形成,并通过外设点火文件的方法实现点火,模拟计算混合气的燃烧过程。计算了燃烧过程中混合气形成以及在不同点火时刻下燃烧放热率、缸内温度、压力随曲轴转角的变化。当设定喷油定时为60°CA BTDC时,在点火时刻,火花塞处可以形成较浓混合气,空燃比约为14.625:1;点火提前角对CO与NO的排放有一定影响,随着点火提前角的减小,CO与NO的排放量减小;于701°CA时点火,放热率峰值最大,可获得较好的燃耗特性。
关键词： LPG;;反应机理;;燃烧放热率;;曲轴转角
Abstract: The reaction mechanism model is
simplified to one that contains 22 species and 42 Chemical reaction
equations,with which the combustion process will be simulated by importing the
simplified model into AVL FIRE and achieving ignition by connecting a ignition
file outside. It shows in the pictures that,the gas mixture and the heat
release rate、the cylinder
temperature and pressure under different ignition timing. It turned out that it
will form a rich mixture around spark plug when setting the injection timing at
60°CA BTDC; with the decrease of the ignition advance angle,the emission of CO
and NO will be decreased; and it will get better burnout characteristics by
setting the ignition timing at 701°CA.
Keywords:LPG;;Reaction Mechanism;;Combustion Heat
Release Rate;;Crank Angle
参考文献：
[1]马卫强.能源压力影响下汽车动力系统发展的取向分析.现代商贸工业,第20卷,2008(1).
[2]社团法人日本自动车工业会.日本的汽车工业[M].东京:日本自动车工业会出版社,2003.5(日文)
[3]Song Philip A1Dua-l Fuelling of a
Pre-chamber Diesel Engine with Natural Gas1ASME,Paper 85-DGP-3
[4]Tomlin A S,Pilling M J,Turanyi T,et
al1Mechanism Reduction for the Oscillatory Oxidation of Hydrogen Sensitivity
and Quas-i steady-state Analyses1Combustion and Flame,1992,91
[5]Blint R J,The 22nd
Symposium(International)on Combustion1The Combustion Institute,Pittsburgy,1988
[6]蒋德明.内燃机燃烧与排放学[M].西安:西安交通大学出版社,2001
[7]王燕军.基于两次喷射的汽油缸内直喷式燃烧系统的研究.博士学位论文,清华大学,2004.
[8]AVL Fire User
Mannual.Version2009[M].2009.
[9]齐运亮,马宗正,许伯彦.车用LPG燃料喷雾过程的研究[J].山东建筑工程学院学报,2006,21
[10]周玉明,胡健丽,刘家全.缸内汽油直喷稀薄燃烧技术[J].内燃机,2006(4).
[11]Hitoshi Kamura、Kouichi Takada,Development of
in-cylinder gasoline direction engine,JSAE9830280:p.175-180
|
