摘要
为了降低柴油引燃天然气发动机的颗粒排放,在改装的柴油机上试验研究了含氧燃料碳酸二甲酯(DMC)添加对柴油引燃天然气发动机燃烧和颗粒排放的影响。通过对比分析不同的含氧燃料掺混比下的燃烧参数和颗粒排放特性发现:随着引燃燃料中DMC掺混比的增大,引燃燃料中含氧量(氧的质量分数)的不断增加,滞燃期逐渐推迟,初始燃烧放热率峰值增大,初始燃烧期逐渐延长,总燃烧持续期不断缩短;柴油引燃天然气发动机的颗粒排放呈现单峰分布,随着引燃燃料中含氧量的增加,颗粒数量浓度峰值粒径向大颗粒粒径方向移动,颗粒的数量浓度和质量浓度同时减小,当引燃燃料中含氧量达20%时,颗粒质量浓度降幅达70%,颗粒数量浓度降幅达86%。因此,引燃燃料中添加含氧燃料DMC是一种降低柴油引燃天然气发动机颗粒排放的有效方法。
In order to reduce particles emissions of diesel pilot-ignited natural gas engines, the combustion and the particles emissions were experimentally investigated on a pilot-ignited natural gas engine using diesel-dimethyl carbonate （DMC） as the pilot fuel, and the corresponding combustion and emissions characteristics were also analyzed. The results show that an increase in the proportion of DMC in the pilot fuel can increase the oxygen content of pilot fuel, extend the ignition delay period, increase the peak of initial combustion rate and initial combustion period, and shorten the total combustion duration. The particle size distribution is all unimodal. With the increase in the oxygen content of pilot fuels, the peak of particle number concentration moves towards the larger particle size, and the particle number concentration and the particle mass concentration decrease simultaneously. The particle number concentration and the particle mass concentration decrease by up to 70% and 86%, respectively, at the oxygenate mass of 20% in pilot mass and a special load. These results indicate that adding DMC to the pilot fuel is an effective method for reducing particles emissions of diesel pilot-ignited natural gas engines.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2014年第1期19-24,共6页
Journal of Xi'an Jiaotong University
基金
国家"973计划"(2011CB707200)
关键词
含氧燃料
天然气发动机
柴油引燃
颗粒排放
oxygenated fuel
natural gas engine
diesel pilot-ignition
particles emission
