柴油机用壁流式过滤体基础模型研究  

Study on the Basal Model of Wall-Flow Diesel Particulate Filters

作　　者：资新运[1] 郭猛超[1] 蔡强[2] 姚广涛[1] 邓成林[1] 

机构地区：[1]军事交通学院汽车工程系,天津300161 [2]军事交通学院装备保障系,天津300161

出　　处：《内燃机工程》2010年第3期61-66,共6页Chinese Internal Combustion Engine Engineering

基　　金：国家"八六三"高技术研究发展计划项目(2006AA060303)

摘　　要：描述了壁流式过滤体内部的气体流动过程,以简化的准稳态流动统一化方程为计算总压降的依据,克服了Konstandopoulos经验公式繁冗复杂、未考虑温度修正的缺点,利用计算流体动力学软件建立了过滤体模型。以BJ493ZQ3发动机为试验用发动机,将DPF连接在发动机排气管尾端,通过试验对模型进行验证,最大误差在3%以内。模型模拟了微观、宏观结构参数及气体参数对干净过滤体压降的影响,得出了参数影响试验用过滤体压降的拐点:微孔径为15μm,孔隙率为50%,孔密度为1 600 cell/cm2,过滤体长度为200 mm,其他参数的影响没有明显的的拐点。Flow process inside the wall-flow diesel particulate filter （DPF） was described. The unified mathematic and physical equations on channel flow based on Quasi-Steady theory were used for calculation of the total pressure drop to avoid problems of complication and omitting the temperature factor for the Konstandopoulos experience formula. The equations were embedded in computation fluid dynamic （CFD） soft-are to establish the DPF model. The verification test in model BJ493ZQ3 diesel engine shows that the errors between the simulation and the experimental measurement are under 3 %. The influences of various structure parameters and gas conditions on clean filter pressure drop were simulated. It is found that there are clear flexion points on the pressure drop curves when df = 15 μm,ε=50% ,ω= 1 600 cell/cm2 ,L=200 mm and there is not for other parameters.

关 键 词：内燃机 柴油机 壁流式过滤体 过滤压降 准稳态 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]