NO_2对柴油机微粒捕集器再生特性的影响机理  

Influence of NO_2 on DPF Regeneration Characteristics

作　　者：马荣[1] 何超[1] 李加强[1,2] 贾传德[1] 王增养[1] 

机构地区：[1]西南林业大学机械与交通学院,云南昆明650224 [2]北京理工大学机械与车辆学院,北京100081

出　　处：《车用发动机》2013年第3期71-74,共4页Vehicle Engine

基　　金：国家自然科学基金资助项目(51006085);云南省应用基础面上项目(2010ZC091);云南省教育厅科学研究基金项目(09C0180)

摘　　要：利用三维CFD软件建立了柴油机微粒捕集器(DPF)三维仿真模型,验证了模型的准确性。通过对NO2氧化炭烟微粒再生机理的DPF仿真计算,研究了炭烟浓度、NO2与NOx的比值、排气温度、空速及发动机负荷对NO2被动再生反应的影响。结果表明:排气中炭烟浓度越大,NO2转化率越高;NO2与NOx的比值越大去除的炭烟微粒越多;正常排气温度有利于NO2实现DPF再生;空速高时DPF再生效果不佳;发动机负荷越高,参与再生过程的NO2越多。Three-dimensional simulation model of diesel particulate filter （DPF） was established by CFD software and the ac- curacy of model was verified. The mechanism of oxidizing soot by NO2 in DPF regeneration was simulated and calculated. The influences of soot concentration, NO2/NOx ratio, exhaust temperature, air velocity and engine load on NO2 passive regenera- tion were researched. The results show that the conversion rate of NO2 is higher in the exhaust with higher soot concentration; NO2/NOx ratio is higher, more soot particulate can be removed. The normal exhaust temperature is beneficial to DPF regenera- tion with NO2. The effect of DPF regeneration is not good under high air velocity. Higher engine load can promote the regener- ation reaction of more NO2.

关 键 词：柴油机 微粒捕集器 二氧化氮 再生 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]