| 柴油机颗粒捕集器内颗粒沉积结构的实验研究 |
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| 引用本文： | 孟忠伟,宋蔷,姚强,徐旭常.柴油机颗粒捕集器内颗粒沉积结构的实验研究[J].燃烧科学与技术,2012(1):20-26. |
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| 作者姓名： | 孟忠伟 宋蔷 姚强 徐旭常 |
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| 作者单位： | 西华大学交通与汽车工程学院汽车测控与安全四川省重点实验室;清华大学热能工程系热科学与动力工程教育部重点实验室 |
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| 基金项目： | 国家自然科学基金资助项目(51106130);四川省教育厅科技创新团队资助项目(KYTD201003);四川省教育厅青年基金资助项目(10ZB078);汽车测控与安全四川省重点实验室开放基金资助项目(SZJJ2011-001);西华大学重点科研基金资助项目(Z1120320);西华大学流体及动力机械省部共建教育部重点实验室学术成果培育资助项目(SBZDPY-11-18) |
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| 摘 要： | 基于可视化单通道实验系统,采用激光位移测量方法,对柴油机颗粒在陶瓷捕集器内的沉积过程进行了在线测量.研究结果发现,颗粒沉积过程分为4个阶段:深床期、长树期、搭桥期和颗粒层期;颗粒层厚度的增加在长树期迅速增长,而后在颗粒层期呈缓慢增加的趋势.颗粒层过滤期颗粒层的孔隙结构受过滤速度的影响,过滤速度增大,颗粒层的渗透系数和孔隙率减小,形成的颗粒层致密.实验结果证实了当Pe<1时,渗透系数和孔隙率随Pe的增大而减小,且变化显著;当Pe>1时,渗透系数和孔隙率随Pe数的变化趋于平坦.
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| 关 键 词： | 柴油机颗粒捕集器 颗粒层 渗透系数 孔隙率 |
Experimental Investigation on Deposition Configuration of Soot Layer in Diesel Particle Filter |
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| MENG Zhong-wei,SONG Qiang,YAO Qiang,XU Xu-chang.Experimental Investigation on Deposition Configuration of Soot Layer in Diesel Particle Filter[J].Journal of Combustion Science and Technology,2012(1):20-26. |
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| Authors: | MENG Zhong-wei SONG Qiang YAO Qiang XU Xu-chang |
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| Affiliation: | 1.Vehicle Measurement,Control and Safety Key Laboratory of Sichuan Province,School of Transportation and Automotive Engineering,Xihua University,Chengdu 610039,China;2.Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Department of Thermal Engineering,Tsinghua University,Beijing 100084,China) |
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| Abstract: | Based on the visualized single channel filtration system,the deposition configuration of soot layer in die-sel particle filter was investigated online by laser displacement measurement.The experimental results show that the filtration process can be divided into four stages:deep bed filtration,particle ‘tree’ growth,particle ‘tree’ connec-tion and particle layer filtration.Soot layer thickness increases rapidly at the second stage and then increases slowly at soot layer filtration stage.Filtration velocity has great effect on soot deposition configuration at soot layer filtration stage.With the increase in filtration velocity,permeability coefficient and the porosity of soot layer decrease,and soot layer becomes denser.When Peclet number(Pe)<1,permeability coefficient and the porosity of soot layer de-crease significantly with the increase of Pe,while when Pe>1,permeability coefficient and the porosity of soot layer nearly remain constant. |
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| Keywords: | diesel particle filter soot layer permeability coefficient porosity |
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