EGR对二甲醚HCCI发动机燃烧特性的影响-《郑州大学学报(工学版)》

文章信息/Info

作者:: 黄锦耀; 严诗伦; 陈朝阳; 1.长安大学汽车学院,陕西西安,710064;2.长安大学汽车学院,陕西西安710064;3.西安交通大学能源与动力工程学院,陕西西安710049

Author(s):: Huang Jinyao1; Yan Shilun1; Chen Chaoyang2; 1. School of Automotive Engineering, Chang’an University, Xi’an, Shaanxi 710064; 2. School of Automotive Engineering, Chang’an University, Xi’an 710064, Shaanxi; 3. School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi

Keywords:: dimethyl ether; EGR; HCCI; combustion performance; numerical simulation

摘要:: 针对HCCI发动机的燃烧控制问题，对不同废气再循环率（EGR）率Regr和过量空气系数?下的二甲醚均质混合压燃发动机的工作过程进行了数值模拟，重点分析了Regr和?对二甲醚HCCI发动机燃烧特性的影响。结果表明：过量空气系数一定时，随着Regr的增大，缸内压力、温度、放热率都会降低，高温反应阶段开始时刻推迟；而在Regr不变的情况下，过量空气系数增大，缸内的压力、温度、放热率降低，低温反应阶段提前，而高温放热时刻推后。表明控制Regr和过量空气系数，能达到有效控制二甲醚HCCI燃烧时刻的目的。

Abstract:: Combustion performance of DME fueled homogeneous charge compression ignition(HCCI) engine under different exhaust gas recirculation (EGR) rate and different coefficient of excess air (?) was studied numerically by using the software CHEMKIN. Influences of EGR and ? on the combustion performance of DME HCCI engine were analyzed. The result showed that at a specific ?, the pressure, temperature and the heat release rate decreased with the increase of EGR rate and the high temperature reaction was delayed. With a specific EGR rate, the pressure, temperature and the heat released rate in cylinder decreased with the increase of ? . And the low temperature reaction advanced while the high temperature reaction delayed. It could be recognized that the ignition time of HCCI engine could be controlled by changing the EGR rate or ? .