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Modeling Aspects of Asymmetric Channel Configuration DPFs
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 20, 2009 by SAE International in United States
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Recently there has been a substantial interest in adopting asymmetric geometry design inside wall-flow diesel particular filters (DPFs) with larger inlet channel width to accommodate soot/ash accumulation and to reduce back pressure and thus to increase filter operation life time. The current work is sought to develop a model based approach to investigate various aspects of this strategy and to compare results with conventional channel design.
This paper describes assumptions and modeling methodologies used to evaluate the impact of asymmetries arising out of geometric design as well as due to ash deposition/accumulation on the overall pressure drop across the filter. Special attention is given to the challenges and strategies associated with flow and thermal solutions (during soot loading or regeneration) since transient ash accumulation causes a time varying reduction of effective wall-flow filtration length. A finite difference method with dynamically adjusted uniform grid for both fluid and solid phases has been found to be much more numerically stable than conventional approach with a fixed grid or using Runga-Kutta shooting method. These analyses are carried out within 1D representative channel level.
This study found that with identical total cross sectional flow area, asymmetric channel cell design with larger inlet channel width than outlet channel width has more ash storage capability and lower pressure drop across the filter. However, the asymmetric designs exhibit slightly higher back pressure than comparable conventional channel designs at the unloaded state. The proposed model is able to reproduce experimental results and trends. Consequently, the proposed model can be used for predicative studies if properly calibrated.
CitationTang, W., Wahiduzzaman, S., Wenzel, S., and Wang, W., "Modeling Aspects of Asymmetric Channel Configuration DPFs," SAE Technical Paper 2009-01-1272, 2009, https://doi.org/10.4271/2009-01-1272.
- Konstandopoulos A. G. Kostoglou M. Housiada P. Vlachos N. Zarvalis D. “Multichannel Simulation of Soot Oxidation in Diesel Particulate Filters” SAE 2003-01-0839 , Detroit, MI 2003
- Konstandopoulos A. G. Johnson J. H. “WallFlow Diesel Particulate Filter-Their Pressure Drop and Collection Efficiency” SAE Transactions, Journal of Engines, Paper NO. 890405 1989 625 647
- Haralampous O. A. Koltsakis G. C. Samaras Z. C. Vogt C. D. Ohara E. Watanabe Y. Mizutani T. “Reaction and Diffusion Phenomena in Catalyzed Diesel Particulate Filters” SAE 2004-01-0696 , Detroit, MI 2004
- Bouteiller B. Bardon S. Briot A. Girot P. Gleize V. “One Dimensional Backpressure Model for Asymmetrical Cells DPF” SAE 2007-01-0045 , Detroit, MI 2007
- Wurzenberger J. C. Kutschi S. “Advanced Simulation Technologies for Diesel Particulate Filters, A Fundamental Study on Asymmetric Channel Geometries” SAE 2007-01-1137 , Detroit, MI 2007
- Konstandopoulos A. G. Skaperdas E. Masoudi M. “Microstructural Properties of Soot Deposits in Diesel Particulate Traps” SAE No. 2002-01-1015 , Detroit, MI 2002
- Tang, W. Wahiduzzaman, S. Leonard, A. “A Lumped/1-D Combined Approach for Modeling WallFlow Diesel Particulate Filters” SAE NO. 2007-01-3971 .
- Bissett E. “Mathematical Modeling of the Thermal Regeneration of a Wall-Flow Monolith Diesel Particulate Filter” Chem. Eng. Sci. 1984 39 1233
- Morel T. Keribar R. Silvestri J. Wahiduzzaman S. “Integrated Engine/Vehicle Simulation and Control” SAE NO. 1999-01-0907 , Detroit, MI 1999
- Gaiser G. Mucha P. “Prediction of Pressure Drop in Diesel Particulate Filters Considering Ash Deposit and Partial Regenerations” SAE 2004-01-0158 , Detroit, MI 2004
- Lee K. W. Gleseke J. “Collection of Aerosol Particles by Packed Beds” Env. Sci. Tech. 1979 13 466 470
- Ogyu k. Ohno K. Hong S. Komori T. “Ash Storage Capacity Enhancement of Diesel Particulate Filter” SAE 2004-01-0949 , Detroit, MI 2004
- Konstandopoulos A. G. Kostoglou M. Skaperdas E. Papaioannou E. Zarvalis D. Kladopoulou E. “Fundamental Studies of Diesel Particulate Filters: Transient Loading, Regeneration and Aging” SAE No. 2000-01-1016 , Detroit, MI 2000