摘要
利用微孔沉积式碰撞采集器(MOUDI)进行了非道路用186FA柴油机排气微粒的采集和排气微粒物质量浓度粒径分布特性研究。研究发现:中高负荷工况下,柴油机排气微粒质量浓度粒径分布呈现近似的对数正态分布特性,而且随着负荷增大峰值粒径向小粒径方向偏移;各粒径级微粒质量浓度随负荷的增大而增大,中高负荷时增大趋势显著;积聚模态及粗粒子模态微粒质量浓度随烟度的增大均有增大的趋势,积聚模态微粒增大趋势相对明显;同一负荷率条件下,积聚模态微粒质量浓度基本随转速的升高而降低;中高负荷时微粒质量平均直径在0.32～0.56μm之间,低负荷时向大粒径级方向发展。
With a micro-orifice uniform deposition impactor （MOUDI）, the exhaust particulates of 186FA off-road diesel engine were collected and the particulate size distribution characteristics of mass concentration were researched. As found in the research, at medium and high load, the particulate size distribution of mass concentration for diesel exhaust particulates presented an approximate lognormal distribution, and the peaks of particulate size distribution shifted to the smaller size with the in crease of load. With the increase of load, the particulate mass concentration of each size class increased and the increasing trend became obvious at medium and high load. The mass concentration of accumulation mode and coarse mode particulates increased with the increase of smoke, but the increasing trend of accumulation mode particulates was relatively obvious. Under the same rate of engine load, the mass concentration of accumulation mode particulates decreased with the increase of speed. At medium and high load, the mass mean diameter of particulates was in the range of 0.32-0.56 μm and shifted to the larger size area at low load.
出处
《车用发动机》
北大核心
2013年第1期70-74,共5页
Vehicle Engine
基金
国家自然科学基金资助项目(50976051)
江苏高校优势学科建设工程资助项目(苏政办发[2011]6号)
关键词
柴油机
微粒
模态
质量浓度
粒径分布
质量平均直径
diesel engine
particulate
mode
mass concentration
particulate size distribution
mass mean diameter
