非对称孔结构载体对DPF及柴油机性能的影响研究

Influence of Asymmetric Cell Carrier on DPF and Diesel Engine Performance

运用GT-Power建立柴油机整机耦合柴油机颗粒捕集器(diesel particle filter,DPF)的模型,研究非对称孔道结构DPF的压降特性及其对柴油机整机性能的影响。研究结果表明:随着进/出口孔道比例增加,碳烟容量增大,DPF压降降低,但过度增大进/出口孔道比例会使出口孔径过小而造成压降升高;柴油机加装洁净DPF时,柴油机各项性能指标随进/出口比例增加而降低,但随着DPF碳烟和灰分沉积量的增加,柴油机各项性能指标随进/出口比例增加均有所改善。DPF进/出口孔道比例为1.3时,柴油机综合性能最佳。

The model of a diesel engine coupled diesel particulate filter(DPF)built by GT-Power software was used to study the pressure drop characteristics of the DPF asymmetric cell carrier and its influence on diesel engine performance.Results show that as the proportion of inlet and outlet channels of the DPF increases,the soot capacity increases,and the DPF pressure drop decreases.However,excessive increase in the proportion of inlet and outlet channels will make the outlet pore diameter too small,resulting in an increase in pressure drop.When the diesel engine is equipped with a clean DPF,the performance indexes of the diesel engine decrease with increase of the proportion of inlet and outlet channels.However,with the increase of the soot and ash deposition in the DPF,the performance indexes of the diesel engine will improve with the increase of the proportion of inlet and outlet channels.When the proportion of inlet and outlet channels is 1.3,the overall performance of the diesel engine is optional.