中文摘要：

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NO。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；N02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。

英文摘要：

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.