柴油机排气微粒壁流式陶瓷过滤体过滤机理及影响因素  

Study on the Trap Mechanisms and Effect Factors of the Diesel Ceramic Wall Flow Filter

作　　者：宁智[1] 宋波[1] 资新运[2] 刘建华[1] 

机构地区：[1]北京交通大学机械与电子控制工程学院,北京100044 [2]军事交通学院,天津300161

出　　处：《北京交通大学学报》2005年第4期69-73,共5页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：国家自然科学基金资助项目(40475048);北京市自然科学基金资助项目(8042018)

摘　　要：在建立壁流式陶瓷过滤体微粒过滤捕集模型的基础上,详细计算分析了壁流式陶瓷过滤体的3种过滤机理:惯性碰撞机理、拦截机理和扩散机理,以及微粒粒径、过滤体微孔孔径、排气流速、气流温度等因素对3种微粒过滤捕集机理下的壁流式过滤体的微粒捕集系数及综合微粒捕集系数的影响及规律,在此基础上分析了提高壁流式过滤体微粒捕集系数的技术途径.研究结果可以为柴油机排气微粒壁流式陶瓷过滤体微粒捕集效率的定性与定量研究以及过滤体的结构优化设计提供依据.On the basis of the building of the particulate trap model of the wall flow filter, the three kinds of particulate trap mechanism, such as inertia trap, direct interception trap and diffusion trap were discussed. At the same time, the affect and the influence regularity of the particulate size, the pore size of the filter, the exhaust velocity and temperature, on the filter coefficient and the competitive filter coefficient had been analyzed under different particulate trap mechanisms. On the basis of the analysis, the technology approaches to improve the filter coefficient were analyzed. The results can provide the theory foundation for the optimistic design of the wall flow filter, and the qualitative and quantitative analysis of the particulate filter efficiency.

关 键 词：过滤机理 过滤体 排气微粒 柴油机 壁流 陶瓷 结构优化设计 过滤捕集 碰撞机理 计算分析 扩散机理 微粒粒径 排气流速 捕集机理 气流温度 定量研究 捕集效率 研究结果 技术途径 集系 基础 

分 类 号：TS262.5[轻工技术与工程—发酵工程] TK421.5[轻工技术与工程—食品科学与工程]