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汽车安全与节能学报

汽车安全与节能学报 ›› 2016, Vol. 07 ›› Issue (04): 442-448.DOI: 10.3969/j.issn.1674-8484.2016.04.013

• • 上一篇    

进气门早关对汽/ 柴油混合燃料燃烧特性的影响

谢宗法，张炯，张开宇，常英杰，黄玉珍   

  1. 山东大学 机械工程学院；山东大学 高效洁净机械制造教育部重点实验室，济南 250061，中国
  • 收稿日期:2016-07-20 出版日期:2016-12-25 发布日期:2016-12-28
  • 作者简介:第一作者 / First author ： 谢宗法（1963—），男( 汉)，山东，教授。E-mail: zongfax@sdu.edu.cn 第二作者 / Second author ： 张炯（1990—），男( 汉)，湖南，硕士研究生。E-mail: zhangjiong3633@163.com
  • 基金资助:

    国家“九七三”重点基础研究项目（2013CB228404）；国家自然科学基金面上项目（51375265）

Effects of early intake valve closing on combustion characteristics of gasoline and diesel blended fuels in diesel engine

XIE Zongfa, ZHANG Jiong, ZHANG Kaiyu, CHANG Yingjie, HUANG Yuzhen   

  1. School of Mechanical Engineering, Shandong University; Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education, Shandong University, Jinan 250061, China
  • Received:2016-07-20 Online:2016-12-25 Published:2016-12-28

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摘要：

为了优化燃烧过程，在SD2100 型柴油机上安装了全可变液压气门机构，采用进气门早关（EIVC）的模式可实现进气门关闭时刻（IVC）和有效压缩比（ECR）的连续可变。在不同IVC 下，对汽油/ 柴油体积掺混比分别为30%、50% 混合燃料的放热规律进行了研究。结果表明：EIVC 和增大汽油比例均会延长滞燃期；随着IVC 的提前，混合燃料的放热率峰值均呈现先增大后减小的变化规律，排气温度增加，燃烧循环变动逐渐增加；随着汽油掺混比增加，放热率峰值增加，排气温度减小，在原机配气相位附近燃烧循环变动基本不变；当IVC 提前至下死点后-58°CA（ABDC），汽油掺混比为50%时，出现类似冷焰反应阶段。

关键词: 柴油机, 进气门早关, 汽油柴油混合燃料, 放热率, 可变有效压缩比

Abstract:

A fully hydraulic variable valve actuation was developed and mounted on a SD2100 diesel engine to optimize combustion process. Early intake valve closing (EIVC) mode was utilized to achieve continuous adjustment of intake valve closing (IVC) and effective compression ratio (ECR). Gasoline was blended with diesel at volume fractions of 30% and 50%, and the combustion characteristics of blended fuels were investigated. The experimental results show that: both EIVC and increasing gasoline blended ratio prolong ignition delay; With the advance of IVC, peak rate of heat release increases firstly and then decreases, exhaust gas temperature is enhanced, and cyclic variation is increased; With the increase of gasoline blended ratio, peak rate of heat release is increased, exhaust gas temperature is reduced, and cyclic variation is nearly unchanged while IVC is close to that of the baseline. When IVC after bottom dead center (ABDC) crank angle (CA) is advanced to -58° and gasoline blended ratio is fixed at 50%, combustion process similar to cool flame is observed.

Key words: diesel engine, early intake valve closing, gasoline and diesel blended fuel, rate of heat release, variable effective compression ratio