乙醇HCCI发动机微量排放物的模拟  

Simulation of tiny pollutant from ethanol HCCI engines

作　　者：肖合林[1] 胡艳[1] 文媛媛[1] 

机构地区：[1]武汉理工大学汽车工程学院,湖北武汉430070

出　　处：《华中科技大学学报（自然科学版）》2010年第11期108-110,123,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：教育部博士学科点专项科研基金资助项目(20020487022);国家重点基础研究发展计划资助项目(2001CB209207)

摘　　要：为了研究乙醇均质充量压缩点燃(HCCI)发动机在缸内和排气管道中微量排放物CH2O(甲醛)、CH3HCO(乙醛)和HCOOH(甲酸)的形成演变过程,提出了乙醇简化反应机理与FLUENT软件耦合计算的方法,对乙醇HCCI发动机燃烧过程产生的微量排放物在缸内和排气管中的变化和分布进行了分析预测,同时还分析了不同当量燃空比和废气再循环率对甲醛和乙醛排放量的影响.结果表明:甲醛和乙醛是乙醇燃烧反应过程中的低温产物,缸内甲醛和乙醛的最终排放量随着当量燃空比的增加而减小,随着废气再循环率的增大而增加.In order to learn the formation process of tiny pollutant CH2O,CH3HCO and HCOOH, this paper presented a measure to couple a new reduced chemical reactions mechanism model of the ethanol to the FLUENT software.Through which it forecasts the formation process of CH2O, CH3HCO and HCOOH in the cylinder and emission pipe of the ethanol HCCI（homogeneous charge compression ignition）engines,and researches the affection of different F/A （fuel and air）ratio and EGR（exhaust gas recirculation）ratio on the exhaust emission of the CH2O and CH3HCO.The results show that CH2O and CH3HCO forecast as low temperature exhaust pollutants during ethanol takes chemical reactions,the emission amounts of CH2O and CH3HCO reduce with the increase of F/ A ratio,and increase with the increase of EGR ratio.

关 键 词：均质充量压缩点燃(HCCI)发动机 乙醇 数值模拟 微量排放物 燃烧反应 

分 类 号：TK462[动力工程及工程热物理—动力机械及工程]