Mechanical Characteristics of Diesel Exhaust Particles Colliding with DPF Filter Wall

WANG Kai; WANG Zhong; LIU Shuai; LI Ruina; ZHAO Yang

doi:10.3969/j.issn.1001-2222.2020.05.008

Vehicle Engine ›› 2020, Vol. 0 ›› Issue (5) : 47-54. DOI: 10.3969/j.issn.1001-2222.2020.05.008

Mechanical Characteristics of Diesel Exhaust Particles Colliding with DPF Filter Wall

WANG Kai¹,WANG Zhong¹,LIU Shuai¹,LI Ruina¹,ZHAO Yang²

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Abstract

In order to study the mechanical characteristics of diesel exhaust particles colliding with filter wall of DPF, a model of particlewall collision and rebound was established based on the collision process of diesel exhaust particles with the filter wall of DPF. Using Fluent simulation software and approximate theory, the velocity field distribution in the channel was simulated, the particlewall collision characteristics such as adhesion force and energy and maximum contact radius were analyzed, and the evaluation indexes such as normal recovery coefficient and critical adhesion speed of rebound were further discussed. The adhesion force of particles during the collision and rebound in the model was measured by using atomic force microscope and test bench, the surface roughness correction coefficient was determined, the deposition morphology of particles on DPF filter wall was also analyzed, and finally the calculated results were verified. The results show that the velocity of flow field in the filter wall decreases first and then increases with the increase of pore passage axial length. The maximum contact radius decreases with the increase of the incident angle and the decrease of velocity of particles. The adhesion force and energy between the particles and wall increase with the increase of particle size and compression distance between particles and wall. The normal recovery coefficient after the particle collision increases and the adhesive velocity decreases with the increase of incident velocity and the decrease of particle surface energy. Besides, the deposited particles at the front and back of channel become less and the particles with small average particle size and large specific surface area are more likely to be trapped.

Key words

diesel engine / exhaust particle / diesel particulate filter / filter wall / collision / mechanical characteristics

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WANG Kai,WANG Zhong,LIU Shuai,LI Ruina,ZHAO Yang. Mechanical Characteristics of Diesel Exhaust Particles Colliding with DPF Filter Wall[J]. Vehicle Engine. 2020, 0(5): 47-54 https://doi.org/10.3969/j.issn.1001-2222.2020.05.008