摘要
柴油机颗粒捕集器是能够有效减少颗粒物排放的装置,而颗粒捕集效率很大程度取决于其内部的气流分布。基于体积平均法建立了捕集器内的三维流体模型,并对流场分布进行分析。在六种入口轴向速度下,研究了进排气通道的平均轴向速度以及多孔壁面的平均渗流速度特点。结果表明:进气通道的平均速度非线性减小,排气通道平均速度非线性增大,交叉点之后平均速度的变化明显加快;多孔壁面的平均渗流速度先减小后增大;进、排气通道平均轴向速度交叉点以及多孔壁面平均渗流速度的最小值出现在捕集器中心处之后。
The diesel particulate filter(DPF)is a very effective device for reducing particulate emissions,and the trapping efficiency depends on the internal airflow distribution.A three-dimensional numerical study on flow characteristics of DPF was conducted based on the volume averaged method.The distribution of the flow field was analyzed.The characteristics of the average axial velocity in the channels and the through-wall velocity were studied for six different inlet velocities.It was shown that the average velocity of inlet channel decreased nonlinearly while the velocity in outlet channels increased nonlinearly along the main flow direction.Meanwhile,the change of the average velocity after the intersection was obviously accelerated.The average through-wall velocity decreased to the minimum value and then increased gradually.The average axial velocity intersection of the both channels and the minimum average through-wall velocity appeared after the center of the filter.
作者
李厚平
史俊瑞
LI Houping;SHI Junrui(School of Transportation and Vehicle Engineering,Shandong University of Technology,Zibo 255049,China)
出处
《山东理工大学学报（自然科学版）》
CAS
2021年第4期1-5,共5页
Journal of Shandong University of Technology:Natural Science Edition
基金
国家自然科学基金项目(51876107)。
关键词
柴油机颗粒捕集器
流速变化
层流
数值模拟
diesel particular filter
velocity variation
laminar flow
numerical simulation
