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 accuracy 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 regeneration 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 regeneration with NO2.The effect of DPF regeneration is not good under high air velocity.Higher engine load can promote the regeneration reaction of more NO2.
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