压缩比对二甲醚燃料均质压缩燃烧的影响  

Evaluation on Effects of Compression Ratio on DME HCCI Combustion Experiments

作　　者：李德钢[1] 黄震[1] 乔信起[1] 彭小圣[1] 罗马吉[1] 

机构地区：[1]上海交通大学机械与动力工程学院

出　　处：《农业机械学报》2005年第10期5-8,共4页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家"973"重点基础研究发展计划资助项目(项目编号:2001CB209208);国家杰出青年基金资助项目(项目编号:50025619)

摘　　要：在一台2135型柴油机上实现了纯DME的均质充量压缩(HCCI)燃烧方式。试验结果表明,DME的HCCI燃烧模式不但可以实现无烟燃烧,还可以有效控制发动机NOx排放,使其接近于零排放。在试验负荷范围内,CO排放随负荷增加而降低;HC排放随负荷变化不大。燃烧机理等研究表明,由于纯DME十六烷值高导致着火比较早(上止点前28°CA左右),该发动机只能在中低负荷较小范围内运行。为扩展发动机适用工况,进一步通过调节试验发动机压缩比的方法来改进和控制HCCI的燃烧。试验结果表明以上方法可以有效地控制HCCI燃烧,拓展了HCCI发动机运转范围。A 2135 C.I. engine was modified to dimethyl ether（DME）homogeneous charge compression ignition （HCCI） combustion. The experimental results showed that DME HCCI Combustion presented almost zero NOx emission and smokeless behavior. Within the engine load range, the emissions of CO decreased with engine load increased, while the HC emissions did not change much. The HCCI combustion of DME presented remarkable two-stage combustion characteristics. The first combustion stage started at around 28℃A. The way of increase fuel input to increase engine load range was very likely to lead to knock. In order to control the ignition and combustion phase of HCCI, the effects of change of compression ratio were evaluated. The experimental results showed that this method is quite effective in enlarging engine load range.

关 键 词：柴油机 压缩比 二甲醚 均质充量压缩燃烧 燃烧控制 

分 类 号：TK421.2[动力工程及工程热物理—动力机械及工程]