含醇汽油的燃烧与排放特性对比试验研究  

Comparative experiment study on combustion and emissions characteristics of gasoline blended with alcohols

作　　者：李煜[1,2] 龚金科 袁文华[2] 伏军 李光明 LI Yu;GONG Jinke;YUAN Wenhua;FU Jun;LI Guangming(State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University,Changsha 410082,China;School of Mechanical & Energy Engineering,Shaoyang University,Shaoyang 422004,China)

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,湖南长沙410082 [2]邵阳学院机械与能源工程学院,湖南邵阳422004

出　　处：《中南大学学报（自然科学版）》2019年第3期734-742,共9页Journal of Central South University:Science and Technology

基　　金：美国国家自然科学基金资助项目(CBET-1236786);国家自然科学基金资助项目(51276056;51176045;91541121)~~

摘　　要：为研究汽油分别掺混甲醇、乙醇、正丁醇和异丙醇-正丁醇-乙醇(IBE)的燃烧与排放特性,在1台进气道喷射型点燃式发动机内分别将不同醇体积分数和不同工况下的含醇汽油进行对比试验研究。研究结果表明:含醇汽油的燃烧相位比纯汽油的燃烧相位提前且随醇体积分数增大更提前,故应推迟点火;含醇汽油的有效热效率除IBE(异丙醇-正丁醇-乙醇)外均下降,而有效燃油消耗率均升高,IBE-汽油的有效燃油消耗率最低;含醇汽油的CO排放在稀燃时随当量比增大而升高,与纯汽油相比,甲醇-汽油的UHC排放升高,而乙醇-汽油、正丁醇-汽油的UTC排放量降低,IBE-汽油的UTC排放量最低;含醇汽油的NOx排放量均比纯汽油的NOx排放量低,甲醇-汽油的排放量最低;相比纯汽油,IBE30的燃烧相位有较大提前,且IBE30与纯汽油的燃烧相位的差距随当量比(即可燃混合气中理论上可完全燃烧的实际含有的燃料质量与空气质量之比)和平均有效压力的增大而减小,有效热效率略高,CO,UHC和NOx排放量均较低;IBE有望成为良好的汽油代用燃料。In order to study the residual emission characteristics of gasoline blended with methanol,ethanol,n-butanol and isopropanol-n-butanol-ethanol(IBE),a comparative test with various alcohol volume fractions and under various operating conditions were respectively carried out in a port-fuel-injection SI(spark ignition)engine.The results show that the combustion phase of alcohol-gasoline is earlier than that of pure gasoline and is much earlier when the volume fraction of alcohol increases,and so the ignition should be delayed when alcohol-gasoline is employed.The brake thermal efficiency of alcohol-gasoline decreases except for IBE,whose brake specific fuel consumption increases,but the IBE-gasoline is the lowest,and the CO emission of alcohol-gasoline increases with the increase of equivalence ratio when lean burns.Compared with pure gasoline,the methanol-gasoline emission increases with the increase of gasoline.Compared with pure gasoline,the combustion phase of IBE30 is much earlier,and their combustion phase difference decreases with the increase of equivalent ratio(i.e.ratio of actual fuel content to air content in a combustible mixture that can be theoretically completely burned)and brake mean effective pressure,and the brake thermal efficiency is slightly higher,while the emissions of CO,UHC and NOx are all lower.IBE is expected to become a good alternative fuel for gasoline.

关 键 词：醇 燃烧 排放 代用燃料 点燃式发动机 

分 类 号：TK421.2[动力工程及工程热物理—动力机械及工程]