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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第5期    总第285期    2018年5月

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文章编号:1672-7207(2018)05-1254-11
乙醇汽油双燃料双喷射系统发动机燃油互换的对比研究
赵乐文,裴毅强,李翔

(天津大学 内燃机燃烧学国家重点实验室,天津,300072)

摘 要: 将1台GDI(gasoline direct injection)增压发动机改装成乙醇汽油的双燃料双喷射系统发动机,系统地对比研究EPI+GDI(进气道喷射乙醇+缸内直喷汽油)和EDI+GPI(缸内直喷乙醇+进气道喷射汽油) 2种燃烧模式对提高发动机燃油经济性、降低气态常规排放和微粒排放的影响规律。研究结果表明:当量比油耗bESFC随乙醇质量分数wethanol的增加逐渐降低;由于乙醇较高的汽化潜热对缸内直喷的充量冷却效果更好,EDI+GPI燃烧模式的燃油经济性比EPI+GDI的好;2种燃烧模式的HC排放量均随wethanol增加而减小;CO排放量随着wethanol增加先减小后增大,但在转折点(wethanol=40%)前,EDI+GPI燃烧模式的CO排放量大;在转折点后,EPI+GDI的CO排放量大;EPI+GDI燃烧模式的NOx排放量随wethanol的增加而增大,而EDI+GPI的NOx排放量呈现相反的趋势;微粒粒径均随着wethanol的增加逐渐降低,乙醇良好的蒸发特性和较高的氧摩尔分数不仅抑制了微粒的生成,而且促进了微粒的氧化;EDI+GPI燃烧模式的微粒排放量明显比EPI+GDI的大。

 

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

Comparative study on fuel swap for dual-fuel dual-injection system engine fueled with ethanol and gasoline
ZHAO Lewen, PEI Yiqiang, LI Xiang

State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China

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 bESFC reduces 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. NOx emission 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.

 

Key words: ethanol gasoline dual-fuel; dual-injection system; fuel swap; fuel economy; particle emission; gaseous regulated emission

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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