中南大学学报（自然科学版）2018，Vol.49Issue(5)：1254-1264,11.DOI:10.11817/j.issn.1672-7207.2018.05.029
乙醇汽油双燃料双喷射系统发动机燃油互换的对比研究
Comparative study on fuel swap for dual-fuel dual-injection system engine fueled with ethanol and gasoline
摘要
Abstract
The dual-fuel dual-injection system engine fueled with ethanol and gasoline was modified by a turbocharged GDI (gasoline direct injection) engine. The two combustion modes of EPI+GDI(ethanol port injection plus gasoline direct injection) and EDI+GPI (ethanol direct injection plus gasoline port injection) for improving engine fuel economy and reducing gaseous regulated emission and particle emissions were compared systematically. The results show that the equivalent specific fuel consumption bESFCreduces with the increase of mass fraction of ethanol wethanol. The fuel economy of EDI+GPI combustion mode is better than that of EPI+GDI, indicating a more efficient charge cooling effect attributable to the high latent heat of vaporization of ethanol by directly injecting into the cylinder. HC emission of the two combustion modes decreases with the increase of wethanol. CO emission decreases first and then increases with the increase of wethanol. What's more, CO emission of EDI+GPI combustion mode is higher than that of EPI+GDI before the turning point (wethanol=40%), but CO emission of EPI+GDI becomes higher after the turning point. NOxemission of EPI+GDI combustion mode increases with the increase of wethanol, while that of the EDI+GPI shows the opposite trend. Furthermore, the particle size gradually decreases with the increase of wethanol, because of the favorable evaporation and the high oxygen mole fraction of ethanol, which not only inhibits the formation of particles, but also promotes the oxidation of the particles. The particle emission of EDI+GPI combustion mode is obviously higher than that of EPI+GDI.关键词
乙醇汽油双燃料/双喷射系统/燃油互换/燃油经济性/微粒排放/气态常规排放Key words
ethanol gasoline dual-fuel/dual-injection system/fuel swap/fuel economy/particle emission/gaseous regulated emission分类
能源科技引用本文复制引用
赵乐文,裴毅强,李翔..乙醇汽油双燃料双喷射系统发动机燃油互换的对比研究[J].中南大学学报（自然科学版）,2018,49(5):1254-1264,11.基金项目
国家科技支撑计划项目(2014BAG10B01)(Project(2014BAG10B01)supported by the National Key Technology R&D Program) （2014BAG10B01）
