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汽车安全与节能学报

汽车安全与节能学报 ›› 2023, Vol. 14 ›› Issue (4): 513-520.DOI: 10.3969/j.issn.1674-8484.2023.04.014

• 汽车节能与环保 • 上一篇    

喷油策略对甲醇/PODEn双燃料压燃燃烧特性的影响

张鼎成1(), 张光德1,2,*(), 陈书郅1   

  1. 1.武汉科技大学 汽车与交通工程学院，武汉 430081，中国
    2.上海交通大学 动力机械与工程教育部重点试验室，上海 200030，中国
  • 收稿日期:2023-02-07 修回日期:2023-05-07 出版日期:2023-08-31 发布日期:2023-08-31
  • 通讯作者: *张光德，教授。E-mail：gd-zhang@wust.edu.cn。
  • 作者简介:张鼎成（1998—），男（汉），陕西，硕士研究生。E-mail：644126493@qq.com。
  • 基金资助:
    湖北省自然科学基金(2015CFA113)

Effects of fuel injection strategy on combustion characteristics of methanol/PODEn dual-fuel compression ignition mode

ZHANG Dingcheng1(), ZHANG Guangde1,2,*(), CHEN Shuzhi1   

  1. 1. School of Automobile and Traffic Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
    2. Key Laboratory of Power Machinery and Engineering of Ministry of Education, Shanghai JiaoTong University, Shanghai 200030, China
  • Received:2023-02-07 Revised:2023-05-07 Online:2023-08-31 Published:2023-08-31

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摘要：

为提高直喷柴油发动机的缸内燃烧效率，降低污染物的排放，研究了不同喷油策略下的甲醇/PODEn混合燃料燃烧、排放特性。基于计算流体动力学（CFD）和仿真分析软件Converge，对某款预混压燃燃烧（PCCI）的直喷柴油发动机进行三维建模；在发动机转速为1 200 r/min，在进气压力100 kPa、进气温度340.6 K的低负荷初始工况下，进行了仿真计算。结果表明：采用单次喷油时，提前喷油能够大幅提升缸压峰值和比放热峰值，使燃油利用率增加，且主要污染物显著减少；但过早喷油，反应速率加快，污染排放增多。采用2次喷油时，随着预喷时刻的提前，预喷、主喷的正时间隔变长，缸压曲线变化不大；比放热曲线出现2个峰值，峰值略微降低，且喷射时刻（曲轴转角，CA）提前；与各自的质量排放峰值比较，碳烟(Soot)、氮氧化物（NOx)、一氧化碳（CO）的质量排放，分别降低了6.89%、5.41%、23.31%；优化后的预喷、主喷的CA为-27°、-22°。

关键词: 直喷柴油发动机, 预混压燃燃烧（PCCI）, 甲醇/PODEn双燃料, 喷油策略, 燃烧排放特性, 燃油利用率

Abstract:

The combustion and emission characteristics of methanol/PODEn mixed fuel under different fuel injection strategies were investigated to improve combustion efficiency and reduce pollutant emissions of a direct injection diesel engine. Based on the Computational Fluid Dynamics (CFD) and simulation analysis software Converge, three-dimensional modeling is carried out for a direct injection diesel engine with a Premixed Compression Combustion Ignition (PCCI) mode. Under the initial low-load conditions of 1 200 r/min engine speed, initial pressure of 100 kPa and initial temperature of 340.6 K were calculated. The results show that in a single injection, the peak pressure and the peak specific exothermic is greatly increased at the early injection time, the fuel utilization ratio is increased, and the main pollutants is significantly reduced; But the reaction rate becomes faster and the emission of pollution increases when the injection time is too early. With the advance of the pre-injection time, the interval between the pre-injection time and the main injection time becomes longer, and the cylinder pressure changes little, the heat release rate curve has 2 peaks, the peak value is slightly reduced, and the injection time (crankshaft angle, CA) is advanced. The mass emission of Soot, NOx and CO are decreased by 6.89%, 5.41% and 23.31% respectively, compared with each peak value. The pre-injection time and the main injection time of the optimal injection strategy are -27° and -22°.

Key words: injection diesel engines, premixed compression combustion ignition (PCCI), methanol/ Poden dual fuels, injection strategies, combustion and emission characteristics, fuel utilizations

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