摘要
为研究缸内直喷(GDI)汽油机典型工况、怠速工况时的微粒排放特性,在一台4G15缸内直喷汽油机上,通过控制冷却液温度为(80±1)℃、喷油时刻为上止点前310°、过量空气系数为1,研究了点火时刻对缸内直喷汽油机怠速工况微粒粒径分布特性的影响。结果表明:微粒数量浓度和表面积浓度随着点火时刻的提前而增加;微粒数量浓度随粒径分布呈单峰状态,核模态微粒数量浓度粒径分布峰值很小且不明显,积聚模态微粒数量浓度明显高于核模态微粒数量浓度;微粒的体积浓度随点火时刻的提前而增大,核模态微粒体积浓度占总体积浓度的比例随点火时刻的提前而减小。
To investigate the particle emission characteristics in idling condition for GDI （gasoline direct injection） engine, a 4G15 GDI engine was chosen as the test bed to reveal the effects of ignition timing on particle size distribution in idling in the cases of coolant temperature of （804-1） ℃, injection timing of 310° CA （crank angle） BTDC （before top dead center） and excess air ratio around 1.0. The results show that the particulate number and surface area concentration increase with the advancing ignition timing; the size of particle number concentration behaves as a unimodal distribution while the size peak of nucleation mode is lower and obscure and the number of accumulation mode particles reaches obviously higher than nucleation mode particles. The particle volume concentration increases with the advancing ignition while the volume concentration ratio of nucleation mode particle in total volume concentration decreases with the advancing ignition.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2015年第3期32-37,共6页
Journal of Xi'an Jiaotong University
基金
国家高技术研究发展计划资助项目(2012AA111702)
国家自然科学基金资助项目(51276080)
中国博士后科学基金项目(2013M540250)
关键词
直喷汽油机
点火时刻
微粒排放
怠速
gasoline direct injection engine
ignition timing
particulate emission
idling condition
