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.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
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)
关键词
内燃机
柴油机
扩张管
微粒捕集器
数值模拟
IC engines
diesel engine
expansion tube
diesel particulate filter（DPF） numerical simulation
