甲醇重整气发动机HCCI燃烧的数值模拟.pdfVIP

第41卷第l2期 上 海 交 通 大 学 学 报 V0I_41 NO．I2 2007年l2月 J()URNAI ()F SHANGHAI JIA()T()NG UNIVERSITY Dec．2007 文章编号：1006—2467(2007)12—1924—06 甲醇重整气发动机HCCI燃烧的数值模拟 刘青妍， 乔信起， 张 华， 黄 震 (上海交通大学机械与动力工程学院，上海 200240) 摘 要：对甲醇重整气发动机的HCCI燃烧过程进行模拟计算，找出其化学反应路径，探讨利用增 压实现甲醇重整气HCCI燃烧的可行性．采用单区模型和详细化学反应动力学机理模拟燃烧，比较 计算结果与试验结果，验证模型正确性；分析主要中间产物生成率的变化，确定关键反应，得出主要 反应路径；计算增压对放热率、缸压、指示功率的影响．研究表明，甲醇重整气的HCCI燃烧呈单阶 段放热，计算的着火时刻、缸内压力和N(】 排放与试验值吻合；()H、H、()、H() 和H () 是关键中 间产物，它们的生成和消耗构成循环，是燃烧的主要路径；对进气适当增压可保证压燃进而省掉进 气加热器并能提高指示功率，增压比过低、过高或进气中冷均不可取． 关键词：均质充量压燃；甲醇重整气；数值模拟；反应路径；增压 中图分类号：TK 432 文献标识码：A NumericaI SimUIation on HCCI Combustion of Reformed Methanol Gas Engine L儿J，Qing—yan． QIAO Xin—qi。 ZHANG Hua。 HUANG Zhen (School of Mechanical Eng．，Shanghai Jiaotong Univ．，Shanghai 200240，China) Abstract：Combustion process of RMG(Reformed Methanol Gas)HCCI Engine was studied．The overall reaction scheme was determined．Feasibility of RMG HCCI combustion with supercharging was discussed． With the use of single—zone combustion model and detailed chemical kinetic mechanism．comparisons be- tween computed and experimental results were carried out．Analyses of the key species history were under— taken to determine important reactions and the overall reaction scheme．The effects of supercharging ratio on heat release rate，cylinder pressure and indicated power were reckoned．The results show that RMG HC- CI combustion is characterized by single—stage heat release．Good agreement between predicted and meas— ured ignition timing，in—cylinder pressure and NO emission was obtained．It was found that OH，H，O，HO2 and H 2 O2 are key species and the overall reaction scheme is t