哈尔滨工程大学学报2024，Vol.45Issue(5)：886-893,8.DOI:10.11990/jheu.202112011
多孔介质微观结构对柴油机颗粒捕集器性能影响的模拟探究
Simulation study on the influence of porous media microstructure on a diesel particulate filter
摘要
Abstract
To optimize the pore structure of a diesel particulate filter and improve its capture and pressure drop per-formance,a two-dimensional DPF pore microstructure model was established based on the pore size probability den-sity function and porosity distribution function.We considered the interception and diffusion mechanisms to calcu-late the deposition distribution and filtration efficiency of particles in the filter.Results revealed that the influence of porous media microstructure and inlet velocity on the filtration efficiency of soot particles was related to the parti-cle size.The initial capture efficiency of 100 nm particles decreased with an increase in inlet velocity.The differ-ence in filtration efficiency of 1 000 nm particles under different heterogeneous filter walls exceeded 30％.The lar-ger the variance of pore size distribution,the greater the number of particles distributed in front of the filter wall,and the higher the filtration efficiency can be realized.However,excessive variance of pore size distribution would lead to an increase in initial pressure drop and serious deterioration of the pressure drop performance of the filter at the end of the filtering process.关键词
颗粒捕集器/数值模拟/微观结构/概率密度函数/压降/捕集效率Key words
particulate filter/numerical simulation/microstructure/probability density function/pressure drop/fil-tration efficiency分类
能源科技引用本文复制引用
李志军,李智洋,李振国,王妍,杨绵松..多孔介质微观结构对柴油机颗粒捕集器性能影响的模拟探究[J].哈尔滨工程大学学报,2024,45(5):886-893,8.基金项目
国家自然科学基金项目(51976136) （51976136）
移动源污染物排放控制技术国家工程实验室开放基金项目(NELMS2019B01). （NELMS2019B01）
