汽油机进气道喷射高碳醇与低碳醇的燃烧与排放特性对比研究  

Comparison of lower alcohols and higher alcohols combustion in a port fuel injection gasoline engine

作　　者：王志强[1,2] 李立君[1] 马寅杰 WANG Zhiqiang;LI Lijun;MA Yinjie(College of Mechanical and Electrical Engineering,Central South University of Forestry and Technology,Changsha 410004,China;College of Informational and Electrical Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;College of Mechanical and Vehicle Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]中南林业科技大学机电工程学院,湖南长沙410004 [2]湖南科技大学信息与电气工程学院,湖南湘潭411201 [3]湖南大学机械与运载工程学院,湖南长沙410082

出　　处：《中南大学学报（自然科学版）》2022年第7期2499-2506,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(52006058);湖南创新型省份建设专项经费资助项目(2019NK2022);湖南省重点研发计划项目(2021NK2023)。

摘　　要：通过发动机台架实验对比分析进气道喷射汽油机燃用低碳醇(甲醇和乙醇)和高碳醇(正丁醇和正戊醇)在不同掺混比(醇体积分数为10%~30%)和当量比(0.83~1.25)下的燃烧与排放特性。分别在不同掺混比(当量比为1)以及不同当量比(10%掺混比)条件下进行发动机台架实验。研究结果表明:汽油掺混醇类燃料会使燃烧加速,导致燃烧相位提前、燃烧持续时间缩短;与纯汽油相比,汽油-醇混合燃料在稀薄条件下具有更高的制动热效率,其中,戊醇-汽油、乙醇-汽油和甲醇-汽油混合燃料能够较好地抑制HC,CO和NO_(x)的排放。The combustion and emissions characteristics of lower alcohols including methanol and ethanol and higher alcohols including n-butanol and n-pentanol in a port fuel injection gasoline engine with full throttle was compared at various blend ratios(volume fraction of alcohol is 10%-30%)and equivalence ratios(0.83-1.25).The experiment was conducted under stoichiometric condition at various blend ratios and 10%alcohol-gasoline blends at various equivalence ratios,respectively.The results show that adding alcohol into gasoline accelerates combustion,resulting in advanced combustion phasing and reducing combustion duration.Additionally,compared to pure gasoline,alcohol-gasoline blends have a higher brake thermal efficiency in lean conditions.10%pentanolgasoline,ethanol-gasoline and methanol-gasoline blends perform more effectively in suppressing HC,CO and NO_(x) emissions.

关 键 词：低碳醇 高碳醇 燃烧 排放 进气道喷射汽油机 

分 类 号：TK418.9[动力工程及工程热物理—动力机械及工程]