裂解气对稀燃甲醇发动机性能影响的仿真研究  

Influences of Dissociated Gas on Lean-burned Methanol Engine Performance

作　　者：王向阳[1,2] 刘宇 解方喜[1,2] WANG Xiangyang;LIU Yu;XIE Fangxi(State Key Laboratory of Automotive Simulation and Control,Jilin University,Changchun 130022,China;College of Automotive Engineering,Jilin University,Changchun 130022,China)

机构地区：[1]吉林大学汽车仿真与控制国家重点试验室,吉林长春130022 [2]吉林大学汽车工程学院,吉林长春130022

出　　处：《车用发动机》2023年第5期51-56,71,共7页Vehicle Engine

基　　金：中国国家自然科学基金(51876079);吉林省科技厅社会发展科技处重点研发项目(20220203156SF)吉林省科技发展计划项目(20210201039GX);。

摘　　要：基于甲醇发动机三维模型,通过CONVERGE仿真软件计算分析了EGR稀释和空气稀释下进气道喷射裂解气对甲醇发动机燃烧特性和排放特性的影响。结果表明:掺烧甲醇裂解气后,缸内混合气分布趋于均匀;同一稀释比下,甲醇裂解气掺烧对空气稀释下燃烧速率的提高要大于EGR稀释;相同裂解气掺烧比下,EGR稀释的CO排放和HC排放明显高于空气稀释,NOx排放明显低于空气稀释,甲醇裂解气掺烧在空气稀释下对CO和NOx排放的降低相对于EGR稀释更为明显,HC排放则相反;随着甲醇裂解气掺烧比的增大,EGR稀释下的最高综合指示热效率逐渐逼近空气稀释,在裂解气掺烧比达到30%时,两种稀释方式的最高综合指示热效率只相差2.6%。Based on the three-dimensional model of methanol engine,the effects of inlet dissociated gas injection under EGR dilution and air dilution on the combustion characteristics and emission characteristics were calculated and analyzed by CONVERGE simulation software.The results show that the mixture distribution tends to be uniform after methanol dissociated gas is mixed.For the same dilution ratio,the combustion rate of methanol dissociated gas in air dilution increases more than that in EGR dilution.At the same time,CO and HC emissions in EGR dilution are significantly higher than those in air dilution,while NO x emission is significantly lower than that in air dilution.The reduction of CO and NO x emissions of methanol dissociated gas blending in air dilution is more obvious than that in EGR dilution,while the HC emission shows the opposite trend.With the increase of methanol dissociated gas mixing ratio,the maximum comprehensive indicated thermal efficiency under EGR dilution gradually approaches that of air dilution,and the difference between them is only 2.6%when the dissociated gas mixing ratio reaches 30%.

关 键 词：甲醇裂解气 稀燃 混合气分布 燃烧特性 排放特性 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]