| 压缩比与EGR对二甲醚的HCCI特性影响的模拟研究 |
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| 引用本文： | 刘成,颜伏伍,罗马吉,李缪. 压缩比与EGR对二甲醚的HCCI特性影响的模拟研究[J]. 武汉理工大学学报(交通科学与工程版), 2008, 32(4) |
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| 作者姓名： | 刘成 颜伏伍 罗马吉 李缪 |
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| 作者单位： | 武汉理工大学汽车工程学院,武汉,430073 |
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| 基金项目： | 国家高技术研究发展计划(863计划)，武汉理工大学校科研和教改项目 |
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| 摘 要： | 应用单区燃烧模型和已建立的二甲醚氧化反应机理,对二甲醚的HCCI过程进行了模拟计算,研究了变压缩比和不同的冷却EGR率对二甲醚的HCCI特性的影响.结果表明:随着压缩比的升高,二甲醚的两阶段着火均有提前.且间隔减小,燃烧持续期缩短;冷却EGR率对二甲醚第一阶段着火时刻并无太大影响,第二阶段着火时刻随EGR率的增大逐渐延迟,缸内压力和温度均有所下降,燃烧持续期增大.
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| 关 键 词： | 二甲醚 均质压燃燃烧 数值模拟 化学动力学 |
Simulation for the Effects of Compression Ratio and EGR on Combustion Characteristics of DME HCCI |
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| Liu Cheng,Yan Fuwu,Luo Maji,Li Liu. Simulation for the Effects of Compression Ratio and EGR on Combustion Characteristics of DME HCCI[J]. journal of wuhan university of technology(transportation science&engineering), 2008, 32(4) |
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| Authors: | Liu Cheng Yan Fuwu Luo Maji Li Liu |
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| Affiliation: | School of Automobile Engineering;Wuhan University of Technology;Wuhan 430073 |
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| Abstract: | The chemical reaction mechanism of Dimethly Ether(DME) and single zone combustion model are used to investigate the effects of compression ratio and cold EGR rate on HCCI combustion characteristics.The results reveal that the increase of compression ratio advances the ignition timing of two stages,shortens the interval of the two stages and combustion duration.Moreover,as cold EGR rate increases,the ignition timing of the first combustion stage has no remarkable change, but the ignition timing of the second... |
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