柴油机微粒捕集器泡沫型滤芯上气流压降特性研究  

Study on the Characteristics of Pressure Drop on Diesel Particulate Foam Filter

作　　者：王曙辉[1] 龚金科[1] 蔡皓[1] 肖彭[1] 伏军[1] 刘云卿[1] 

机构地区：[1]湖南大学机械与汽车工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2008年第7期31-35,共5页Journal of Hunan University:Natural Sciences

基　　金：国家'985'资助项目(重教函[2004]1号);湖南省自然科学基金资助项目(06JJ20018)

摘　　要：研究了柴油机微粒捕集器泡沫型多孔介质滤芯上的气流压降特性,提出了一种预测泡沫型多孔介质滤芯气流压降的理论模型.模型将泡沫型滤芯材料复杂的内部孔隙结构简化成规则布置的球形通道,直接以滤芯材料的孔隙率和平均孔隙直径为基本参数,同时考虑了流体流过滤芯时介质骨架表面对其的摩擦阻力作用以及介质骨架在流体中的形状阻力,并给出了描述多孔介质滤芯的压降特性关系式及式中渗透率和惯性项系数的计算方法.研究结果显示,对于壁流式滤芯来说,使用达西公式来描述气流通过过滤介质时的压降具有足够的精度,而通流式滤芯必须考虑气流惯性项的影响,公式对其具有良好的适用性.该文的研究结果可以作为DPF的设计和优化提供理论依据和参考.The characteristics of pressure drop on porous medium of diesel particulate filter （DPF） were studied, and a new theoretical model to describe the gas flow pressure drop on the porous medium of filters was presented. To get the model, the tanglesome framework and irregular pore were simplified as regular matrix spherical channel, the porosity and mean pore size of the porous material were treated as the basic parameters directly, and both the framework surface friction resistance and shape drag on the gas flow were considered. The model presents a formulation for the calculation of the gas flow pressure drop and methods tO decide the permeability and the coefficient of inertial term, The results have shown that Dacy＇s law has adequate precision for the wall-flow filters to predict the pressure drop, but for the foam flow-through filters, the inertial effects of gas flow must be considered, and the equation is suitable to ascertain. The results of the study can be used as a reference for DPF＇s design and optimization.

关 键 词：排放控制 柴油机微粒捕集器 壁流式过滤体 通流式过滤体 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]