轻型柴油机用微粒捕集器内流场分析及结构优化  

Distribution of Fluid Field and Structure Optimization Using Particulate Filter in Light Diesel Engine

作　　者：侯献军[1,2] 张新[1,2] 杜松泽[1,2] 许京[1,2] 李孟孟[1,2] 

机构地区：[1]现代汽车零部件技术湖北省重点实验室(武汉理工大学),武汉430070 [2]汽车零部件技术湖北省协同创新中心,武汉430070

出　　处：《武汉理工大学学报（交通科学与工程版）》2015年第6期1157-1160,共4页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：湖北省自然科学基金重点项目资助(批准号:2013CFA104)

摘　　要：采用CFD数值模拟的方法对柴油机微粒捕集器内流场进行仿真分析,研究其速度、温度及压力的分布状况,分析入口流速、载体长度、扩张角及发动机运行工况等参数对载体前端面速度均匀性系数及背压的影响.研究表明,入口流速、发动机转速和扩张角度的减小,以及载体长度的增加均有利于提高微粒捕集器的流场均匀性.并对微粒捕集器结构进行优化设计,改进后流场均匀性系数由0.837 6上升到0.923 8,背压由6.9kPa下降到5.6kPa.The paper has a CFD analysis on the fluid field of the diesel particulate filter, including the distribution of velocity, pressure and temperature field. In addition, the thesis have a research on the influence on distribution of fluid field and back pressure in DPF of some factors, such as exhaust gas inflow velocity, carrier length, angle of entrance expansion and different working condition of engine. The research shows that less exhaust gas inflow velocity, angle of entrance expansion and engine speed, more carrier length can improve the uniformity of fluid field. Then the paper makes structure optimization design On DPF, and the analysis shows that the uniformity of flow field of the new model rises from 0. 837 6 to 0. 926 8 and back pressure declines from 6.9 kPa to 5.6 kPa.

关 键 词：微粒捕集器 内流场 均匀性 背压 

分 类 号：TK402[动力工程及工程热物理—动力机械及工程]