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.
出处
《车用发动机》
北大核心
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)
关键词
柴油机
微粒捕集器
二氧化氮
再生
数值模拟
diesel engine
DPF
nitrogen dioxide
regeneration
numerical simulation
