近后喷射对装载POC柴油机排气颗粒粒径分布的影响研究  

Effect of Close Post-injection on Particle Size Distribution for a Diesel Engine Equipped with Particle Oxidation Catalyst

作　　者：潘晓璇 李新令[1,2] 罗悦齐 曾子慧[1] 周校平 Pan Xiaoxuan;Li Xinling;Luo Yueqi;Zeng Zihui;Zhou Xiaoping(Key Laboratory of Power Machinery and Engineering,Ministry of Education,Shanghai Jiao Tong University,Shanghai,200240,China;Institute of Eco-Chongming(IEC))

机构地区：[1]上海交通大学动力机械与工程教育部重点实验室,上海200240 [2]崇明生态研究院

出　　处：《小型内燃机与车辆技术》2020年第4期1-8,共8页Small Internal Combustion Engine and Vehicle Technique

基　　金：国家自然科学基金项目(51976119);国家重点研发计划中日环境-能源产业联合研究平台(2017YFE0127100)。

摘　　要：基于一台电控共轨柴油机研究了氧化催化型后处理装置(DOC+POC)结合近后喷射策略对排气颗粒粒径分布、数量浓度和颗粒挥发性的影响。发现近后喷射可以显著降低主喷阶段的缸内温度,并提高燃烧后期的温度,有利于DOC+POC后处理装置颗粒去除率的提高;低负荷时,近后喷尽管对积聚态颗粒的影响不显著,但能够显著抑制核模态颗粒的生成;中等负荷条件下,积聚态颗粒数量浓度随着近后喷的引入而显著降低;采用小间隔的近后喷射和加装DOC+POC能够有效去除核模态颗粒以及颗粒物中的挥发性成分。The effects of oxidation catalyst post-treatment device(DOC+POC) combined with close post-injection strategy on particle size distribution, number concentration and volatility were studied on an electronically controlled common rail diesel engine. It is found that close post-injection reduces in-cylinder temperature during the main injection stage and increases the temperature in the later stage of combustion, which improves the particle removal efficiency after DOC+POC. At low load, no significant effect of close post-injection on the accumulation mode particles emission was observed, while a significant reduction in the nucleation mode particles was observed. At medium load, the accumulation mode particle number concentration decreases with the introduction of close post-injection. It is proved that the strategies of close post-injection and DOC+POC significantly reduce nucleation mode and volatile composition in the exhaust particles.

关 键 词：共轨柴油机 颗粒物粒径分布 颗粒氧化催化转化器 近后喷射 颗粒挥发性 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]