Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (2): 422-434.doi: 10.13229/j.cnki.jdxbgxb20200823

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Simulation on influence of microstructure of the wall on deep bed filtration of particulate filter

Zhi-jun LI1(),Hao LIU1,Li-peng ZHANG2(),Zhen-guo LI3,Yuan-kai SHAO3,Zhi-yang LI1   

  1. 1.State Key Laboratory of Engines，Tianjin University，Tianjin 300072，China
    2.Tianjin Internal Combustion Engine Research Institute，Tianjin 300072，China
    3.China Automotive Technology and Research Center Limited Company，Tianjin 300300，China
  • Received:2020-10-27 Online:2021-03-01 Published:2021-02-09
  • Contact: Li-peng ZHANG E-mail:lizhijundd@163.com;zhanglipeng@tju.edu.cn

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Abstract:

Gasoline direct injection （GDI） engine cars are widely welcomed by the market due to their outstanding fuel economy and engine power density. However， compared to traditional port injection engines and diesel engines equipped with diesel particulate filter （DPF）， GDI engines have higher particulate emissions. Therefore， countries around the world have enacted laws to limit particulate emissions. Gasoline particulate filter （GPF） is an effective solution to the problem of particulate matter emission. Aiming at the dynamic filtration process， filtration efficiency and pressure drop performance of the gasoline particulate filter， the probability density function （PDF） of the pore size distribution and the piecewise function of the porosity distribution are used to characterize the heterogeneity of the microstructure of the porous medium. The log-normal distribution is introduced to describe the particle size distribution of incident particles， and the influence of the filter wall microstructure on the GPF deep bed filtration process under the condition of multi-particle size incident is studied. The results show that the porous medium is saturated from the upper 1/6 area， and most of the particles are deposited in the upper 1/3 area of the porous wall. The increase of the pore size will lead to the downward expansion of the deposition position， the decrease of the first saturated layer and the improvement of the uniformity of the porosity distribution， while the change of the porosity will have a small effect on the particle deposition position. The filtration performance and pressure drop performance of porous media show a trade-off relationship. Compared with porosity changes， the filtration efficiency and pressure drop performance of porous media are more sensitive to changes in pore size， and the porosity has little effect on the initial filtration efficiency. The porous media with large porosity and small pore size has higher filtration efficiency and the best pressure drop performance.

Key words: power machinery and engineering, gasoline particulate filter, microstructure, pore size distribution, particle size distribution, pressure drop, filtration efficiency

CLC Number: 

  • TK411

Fig.1

Pore size distribution(MPS＝14 μm)"

Fig.2

Porosity distribution along wall thickness direction(ε=0.48)"

Fig.3

Comparison on filtration efficiency between simulation results and experimental datas"

Fig.4

Particle size distribution"

Fig.5

Saturation mass fraction distribution"

Fig.6

Deposition mass distribution"

Fig.7

Porosity distribution"

Fig.8

Permeability distribution"

Fig.9

Change of filter performance with porosity"

Fig.10

Change of filter performance with pore size"

Fig.11

Distribution of initial filtration efficiency of filters with small pore size"

Fig.12

Distribution of pressure drop growth rate of filters with small pore size"

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