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Research Papers: Internal Combustion Engines

Three–Dimensional Transient Elastic Thermal Stress Field During Diesel Particulate Filter Regeneration

[+] Author and Article Information
Zhenhua Guo, Biqing Sheng, Wen Peng

Department of Mechanical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588

Zhaoyan Zhang

Department of Mechanical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588zzhang5@unl.edu.

J. Eng. Gas Turbines Power 131(1), 012802 (Nov 20, 2008) (9 pages) doi:10.1115/1.2979000 History: Received April 17, 2007; Revised May 20, 2008; Published November 20, 2008

A displacement based 3D finite element model is developed to simulate thermal stress induced by high temperature and temperature gradient during diesel particulate filter (DPF) regeneration. The temperature field predicted by 3D regeneration model from previous work is used as input. This finite element model agrees well with commercial software. It is a self-contained package capable of implementing meshing body, assembling global stiffness matrix and solving final equilibrium equations. Numerical simulation indicates that it is peak temperature rather than temperature gradient that leads to higher compressive thermal stress during regeneration. The maximum stress always appears at the channel corner located at the end of DPF. Parametric studies are performed to investigate the effects of DPF design on pressure drop, regeneration temperature, and thermal stress. This model provides insights into the complicated DPF working mechanism, and it can be used as design tools to reduce filter pressure drop while enhance its short term and long term durability.

Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of DPF channels: (a) side view and (b) front view

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Figure 2

Computational domain for temperature field

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Figure 3

Geometry of porous wall for 3D thermal stress analysis

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Figure 4

Thermal stress predicted by 3D model

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Figure 5

Thermal stress predicted by ANSYS

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Figure 6

Comparison of thermal stress at the end of DPF between 3D model and ANSYS

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Figure 7

Back view of thermal stress in cordierite DPF when maximum temperature gradient occurs for initial soot loading at 220g

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Figure 8

Back view of thermal stress in cordierite DPF when maximum temperature occurs for initial soot loading at 220g

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Figure 9

Back view of thermal stress in cordierite DPF when maximum temperature gradient occurs for initial soot loading at 240g

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Figure 10

Back view of thermal stress in cordierite DPF when maximum temperature occurs for initial soot loading at 240g

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Figure 11

Back view of thermal stress in SiC DPF when maximum temperature occurs for initial soot loading at 240g

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Figure 12

Variation of maximum compressive thermal stress with initial soot mass loading

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Figure 13

Pressure drops during particulate loading for five different DPF geometries with constant filtration volume

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Figure 14

Porous wall temperatures during regeneration for five different DPF geometries with constant filtration volume

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Figure 15

Maximum compressive thermal stress during regeneration for five different DPF geometries with constant filtration volume

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Figure 16

Pressure drops during particulate loading for five different DPF geometries with constant cell density

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Figure 17

Porous wall temperatures during regeneration for five different DPF geometries with constant cell density

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Figure 18

Maximum compressive thermal stress during regeneration for five different DPF geometries with constant cell density

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