正六边形和四边形孔道DPF性能的仿真试验研究

程晓章，刘长波，钱赛，管金彪

合肥工业大学 汽车与交通工程学院，安徽 合肥  230009

摘要：基于AVL-Fire软件建立正六边形和四边形孔道结构柴油机颗粒捕集器（diesel particulate filter, DPF）模型，对不同排气温度、排气质量流量、碳烟负载下2种孔道结构的DPF压降特性、碳烟再生特性进行仿真分析和对比。结果表明：相同排气质量流量下，2种孔道的DPF压降随碳载量和排气温度升高而增大；六边形孔道结构DPF的压降特性优于四边形孔道，碳烟承载量大于四边形孔道，有利于减小DPF主动再生频率，降低再生时的最高温度；与四边形孔道相比，六边形孔道的承载面积和进口孔道开口率更大，碳烟滤饼层更薄，在连续再生时，NO2对碳烟的氧化反应更充分、迅速，可以进一步降低DPF主动再生频率，延长DPF载体的使用寿命。

关键词：孔道结构；DPF；压降；再生；数值分析

Numerical and experimental study on DPF performance of hexagonal and quadrilateral channels

CHENG Xiaozhang, LIU Changbo, QIAN Sai, GUAN Jinbiao

School of Automotive and Traffic Engineering, Hefei University of Technology, Hefei 230009, China

Abstract：Based on AVL-Fire software, two kind of diesel particulate filter (DPF) model with hexagonal and quadrilateral channels are established, the pressure drop characteristics and soot regeneration characteristics of two kinds of channels structures under different exhaust temperature, exhaust mass flow and soot load are simulatedand compared. The results show that the pressure drop of two kinds of channels increases with the increase of carbon load and exhaust temperature at the same exhaust mass flow, the pressure drop characteristic of hexagonal channel structure DPF is better than that of quadrilateral channel, and the soot bearing capacity is greater than that of quadrilateral channel, which can reduce the active regeneration frequency and the highest temperature of the DPF. Compared with quadrangular channels, hexagonal channels have larger bearing area and inlet channel opening rate, thinner soot filter cake layer, and more sufficient and rapid oxidation reaction of NO2 to soot during continuous regeneration, which can further reduce the active regeneration frequency of DPF and prolong the service life of DPF carrier.

Keywords:pore structure; DPF; pressure drop; regeneration; numerical analysis