摘要
为探究柴油机排气参数和催化型柴油颗粒捕集器(catalytic diesel particulate filter,CDPF)结构参数对CDPF再生特性的影响规律,采用了发动机台架试验与数值模拟相结合的研究方法,研究了排气温度、氧气体积分数、排气流量、NO_(2)体积分数、初始炭载量、孔密度和孔壁厚度等因素对CDPF再生特性的影响规律。结果表明:提高排气温度、氧气体积分数和NO_(2)体积分数能够提升碳烟的最大氧化速率,缩短再生时间;增加初始炭载量能够提高碳烟最大氧化速率,但是再生时间不改变。此外,CDPF结构参数对再生特性也会产生影响,即随着孔密度的增加,碳烟最大氧化速率会逐渐降低,再生时间略有增加;随着孔壁厚度的增加,碳烟最大氧化速率也会逐渐降低,而再生时间大致相同。通过敏感性分析结果可知,排气温度、氧气体积分数、排气流量、初始炭载量及孔密度对碳烟最大氧化速率影响显著,影响程度由高到低依次为:排气温度、初始炭载量、氧气体积分数、排气流量、孔密度。而NO2体积分数和孔壁厚度对碳烟最大氧化速率的影响不显著。另外,上述各参数中仅排气温度对再生时间的影响显著,而其他排气参数和CDPF结构参数对再生时间的影响并不显著。
To investigate the effects of diesel exhaust parameters and catalytic diesel particulate filter(CDPF)structural parameters on CDPF regeneration characteristics,a combined approach of engine bench testing and numerical simulation was employed.The influences of factors such as exhaust temperature,oxygen volume concentration,exhaust flow rate,NO_(2)volume fraction,initial soot load,pore density,and wall thickness on CDPF regeneration were analyzed.The results indicate that increasing exhaust temperature,oxygen volume concentration,and NO2 volume fraction can increase the maximum oxidation rate of soot,and reduce regeneration time.The increase in initial soot load improves the maximum oxidation rate of soot,but it does not affect regeneration time.Additionally,the structural parameters of the CDPF also influence regeneration characteristics.With the increase of cell density,the maximum oxidation rate of soot gradually decreases and regeneration time slightly increases.Furthermore,as wall thickness increases,the maximum oxidation rate of soot and the maximum soot oxidation rate gradually decreases,while the regeneration time remains approximately the same.Sensitivity analysis indicates that exhaust temperature,oxygen volume fraction,exhaust flow rate,initial soot load and pore density have a significant impact on the maximum oxidation rate of soot.The influence of the parameters from the greatest to the least is exhaust temperature,initial soot load,oxygen volume fraction,exhaust flow rate,pore density.By contrast,NO_(2) volume fraction and pore wall thickness have minimal effects on the maximum oxidation rate of soot.Among the parameters studied,only exhaust temperature has a significant impact on regeneration time,while other exhaust and CDPF structural parameters do not significantly affect regeneration time.
作者
于津涛
宋崇林
李浩
周逸东
乔约翰
YU Jintao;SONG Chonglin;LI Hao;ZHOU Yidong;QIAO Yuehan(CATARC(Yangzhou)Automotive Engineering Research Institute Company Limited,Yangzhou 225600,China;State Key Laboratory of Engines,Tianjin University,Tianjin 300072,China;Great Wall Motors Co.,Ltd.,Baoding 071000,China)
出处
《内燃机工程》
北大核心
2025年第5期76-86,99,共12页
Chinese Internal Combustion Engine Engineering
关键词
柴油机
催化型柴油颗粒捕集器
再生
碳烟氧化速率
排气温度
diesel engine
catalyzed diesel particulate filter(CDPF)
regeneration
soot oxidation rate
exhaust temperature
