柴油机微粒捕集器非对称孔道内流场和压降特性模拟

发布时间：2018-01-06 02:09

本文关键词：柴油机微粒捕集器非对称孔道内流场和压降特性模拟　出处：《吉林大学学报(工学版)》2016年06期 　论文类型：期刊论文

【摘要】：采用Fluent建立了柴油机微粒捕集器(DPF)非对称孔道的三维模型,计算了孔道内的流动和压降特性,分析了DPF内碳烟微粒的沉积过程,比较了不同壁面渗透率和碳载量下对称孔道与非对称孔道中的压降特性。研究结果表明:进口孔道速度沿轴向先增大后减小,出口孔道速度沿轴向逐渐减小;进口孔道静压沿轴向先减小后增大,出口孔道静压沿轴向逐渐减小;碳烟微粒总是先在孔道的后端沉积,随着碳载量增大,碳烟微粒沿孔道轴向分布逐渐趋向于均匀;绝对碳载量系数大于0.3时,非对称孔道相对于对称孔道具有较小的压降;进、出口孔道比例越大,压降受排气流量的影响越大。
[Abstract]:Established by Fluent diesel particulate filter (DPF) three-dimensional model of asymmetric channel, flow and pressure drop characteristics of pore was calculated and analyzed in the deposition process of DPF soot particles, compared with symmetric and asymmetric pore pressure drop characteristics of different pore wall permeability and carbon loading in the study. The results show that the inlet channel velocity along the axial direction increases first and then decreases, the export channel speed decreases gradually along the axial direction; the import channel static pressure along the axial direction decreases first and then increases, export channels decreases gradually along the axial static pressure; soot particles is always first in the channel after the end of deposition, with carbon load increases, soot particles distribution along the axial direction tend to be uniform; the amount of carbon load coefficient absolute is greater than 0.3, asymmetric channels with respect to the symmetry of smaller pressure drop into the pore, pore; export ratio is greater, the pressure drop is affected by the flow of exhaust gas is greater.

【作者单位】：天津大学内燃机燃烧学国家重点实验室;天津市圣威科技发展有限公司;
【基金】：国家自然科学基金项目(51276128) 科技部中欧中小企业节能减排发展专项基金项目(SQ2013ZOA100012)
【分类号】：TK421.5
【正文快照】： pressure drop becomes more significant.0引言目前,国内外对有效去除柴油机微粒的相关研究越来越重视。控制柴油机微粒排放,不仅要发展机内净化技术,还要采用必要的后处理技术[1-3],柴油机微粒捕集器(Diesel particulatefilter,DPF)是目前公认的最为有效的去除柴油机排气微

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