扩张管结构参数对柴油机微粒捕集器工作特性及再生影响研究  

Research on Influence of Expansion tube Structure on Operating Characteristic and Regeneration of Diesel Particulate Filter

作　　者：李小华[1] 丁道伟[1] 施蕴曦[1] 陈亚运[1] 蔡忆昔[1] 

机构地区：[1]江苏大学汽车与交通工程学院,镇江212013

出　　处：《内燃机工程》2016年第5期61-69,共9页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金项目(51176067);教育部博士点基金资助项目(20103227110014);江苏省高校优势学科建设项目(苏政办发〔2011〕6号)

摘　　要：对不同扩张管条件下柴油机微粒捕集器(diesel particulate filter,DPF)内部的气流流动、微粒沉积及再生过程进行了数值模拟,研究了扩张管对DPF内部气流流动、微粒层厚度分布及再生特性的影响规律。研究结果表明:适当增大扩张管的扩张角有利于加快再生反应速率并降低再生时DPF内轴向最大温度梯度,但过大的扩张角会导致DPF内部气流流动、微粒层厚度及再生时DPF壁面温度的均匀性变差,同时导致再生时DPF壁面最高温度升高,径向最大温度梯度增大。Numerical simulation was carried out on fluid flow, particle deposition and regeneration inside diesel particulate filter （DPF） connected with differentexpansion tube to study the influence of expansion tubeon fluid flow, particle thickness distribution and regeneration characteristic inside DPF. The results indicate that properly improving expanding angle of expansion tube is helpful to accelerate regeneration reaction and to reduce maximum axial temperature gradient in process of DPF regeneration. However, excessive expanding angle will deterioration the uniformity of fluid flow, particle thickness and wall temperature, and lead to slightly higher maximum wall temperature and radial temperature gradient.

关 键 词：内燃机 柴油机 扩张管 微粒捕集器 数值模拟 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]