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汽车安全与节能学报

JASE ›› 2016, Vol. 07 ›› Issue (04): 420-426.DOI: 10.3969/j.issn.1674-8484.2016.04.010

• 汽车节能与环保 • 上一篇    下一篇

固定柴油引燃量时不同甲醇替代率对DMCC 发动机着火与燃烧特性的影响

姚春德，刘美娟，王斌，王全刚，吴涛阳   

  1. 天津大学 内燃机燃烧学国家重点实验室，天津300072，中国
  • 收稿日期:2016-09-12 出版日期:2016-12-25 发布日期:2016-12-28
  • 作者简介:第一作者 / First author ： 姚春德(1955—)，男( 汉)，安徽，教授。E-mail: arcdyao@tju.edu.cn 第二作者 / Second author ： 刘美娟（(1990—)，女( 汉)，河北，硕士研究生。E-mail: mj_liu@tju.edu.cn
  • 基金资助:

    国家自然科学基金重点项目/ National Natural Science Foundation of China (51336005)

Effect on characteristics of ignition and combustion of a DMCC engine at different methanol replacement rates with fixed amount of diesel to ignite

YAO Chunde, LIU Meijuan, WANG Bin, WANG Quangang, WU Taoyang   

  1. State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
  • Received:2016-09-12 Online:2016-12-25 Published:2016-12-28

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摘要：

为了使柴油甲醇组合燃烧（DMCC) 发动机能够最大限度提高甲醇替代率以更好地满足应用要求，在一台电控单体泵的增压中冷柴油机上研究了固定柴油引燃油量同时通过改变甲醇喷射量来满足发动机对中低负荷响应需求，探究了该条件下柴油引燃甲醇混合气的双燃料的着火与燃烧特性。结果显示：在引燃柴油不变情况下，为了满足负荷的需要而增加甲醇混合气浓度时，双燃料燃烧时的缸内压力和压力升高率先缓慢上升而后急剧增加，燃烧放热规律从只有预混的单峰燃烧逐渐过渡到双峰燃
烧,然后又变回到单峰。放热率的预混燃烧峰值随甲醇量的增加先增加而后趋缓，并且高于纯柴油模式，到了最大替代率时放热率几乎成为全预混燃烧。双燃料燃烧的着火滞燃期和燃烧持续期随着负荷增加呈现先延长后缩短的趋势；虽然双燃料模式滞燃期明显长于纯柴油模式，但是其放热中点明显早于纯柴油模式。

关键词: 柴油机, 混合燃烧, 柴油甲醇组合燃烧(DMCC) , 滞燃期, 甲醇

Abstract:

In order to make diesel methanol compound combustion (DMCC) engine better applied to the actual and to maximize the methanol replacement rate, the experimental study was conducted to investigate the ignition and combustion characteristics in an electronically controlled unit pump diesel engine with the amount
of diesel fixed. The results showed that, with the amount of diesel fixed, in-cylinder pressure and pressure rise rate in dual fuel engine first increases lightly and then sharply compared with pure diesel mode. As the engine load increases, the combustion process proceeds in two distinguishable phases, where the peak of premixed combustion heat release rate increases with the increase of the amount of methanol and then tended to be the same. Ignition delay period of duel fuel combustion is longer than that of pure diesel mode. As the load increases, dual fuel ignition delay prolongs first and then decrease. It is concluded that dual-fuel combustion duration first increases and then shortens rapidly with increasing engine load, meanwhile the curve center of the heat release rate for dual fuel combustion tends to move towards TDC which is earlier than pure diesel mode.

Key words: diesel engines, mixed combustion, diesel methanol compound combustion (DMCC), ignition delay, methanol