利用流体分析软件Fire建立了柴油机氧化催化器（DOC ）的三维仿真模型，并通过试验验证了模型的有效性。通过仿真模型分析了空速、DOC入口温度、NO与NOx 浓度比（RNO ）、CO浓度和 HC浓度对柴油机DOC后NO2与NOx 浓度比（RNO2）的影响。仿真结果表明：增加空速，DOC后的 RNO2降低；DOC入口的 RNO 、CO浓度、HC浓度增大，DOC末端的RNO2增加；DOC后的RNO2随DOC入口排气温度的增加先升高后降低，在600 K附近达到最大值。%A DOC 3D model for diesel engine was established with FIRE fluid software and its validity was verified by the ex-periment .Based on the model ,the influences of space velocity ,DOC inlet temperature ,NO/NOx ratio (RNO ) ,CO concentra-tion and HC concentration on NO2/NOx ratio (RNO2 ) after DOC were analyzed .The results show that RNO2 decreases after in-creasing the space velocity .With the increase of RNO ,CO concentration and HC concentration at the entrance of DOC ,the RNO2 after DOC increases .With the increase of DOC entrance temperature ,the RNO2 after DOC first increases and then decreases , and reaches the maximum at 600 K .
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