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Soot emission prediction of diesel engine with EGR |
1.School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.School of Mechanical Engineering, Nantong University, Nantong, Jiangsu 226019, China |
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Abstract The oxidation model by hydroxyl group was embedded into KIVA-3V to investigate the emission of DI diesel engine and to verify the model. The effects of EGR ratios of 5%, 10%, 15%, 20% and 25% on soot emission were discussed. The results show that the calculated soot emission is good consistent with measured result. The improved oxidation model can predict soot emission well. When the EGR ratio increases, soot emission increases slightly at low load, and increases much at middle or heavy load, especially increases much more for high EGR ratio. With the increasing of EGR ratio, soot oxidation mass decreases more than soot production mass with wide distribution of high soot mass concentration. The inhibition effect of EGR on hydroxyl group is obvious at the middle stage of combustion. When the load increases, the concentration of hydroxyl group decreases markedly with the increasing of EGR ratio.
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