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A Comparison of Steady, Pulsating Flow Measurements and CFD Simulations in Close Coupled Catalysts
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 24, 2001 by SAE International in United States
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Event: Spring Fuels & Lubricants Meeting & Exhibition SAE International Fall Fuels & Lubricants Meeting & Exhibition
Performance improvements of automotive catalytic converters can be achieved by improving the flow distribution of exhaust gases within the substrate. The flow distribution is often assumed to be adequately described by measurements obtained from steady flow rigs. An experimental study was carried out to characterise the flow distribution through the substrate of a close-coupled catalytic converter for both steady and pulsating conditions on a flow rig and on a motored engine. Computational fluid dynamic (CFD) simulations were also performed. On the flow rig, the flow from each port was activated separately discharging air to different regions of the substrate. This resulted in a high degree of flow maldistribution. For steady flow maldistribution increased with Reynolds number. Pulsating the flow resulted in a reduction in flow maldistribution. Different flow distributions were observed on the motored engine when compared to composite maps derived from the rig. For the engine study significantly more flow activity was observed at the periphery of the substrate, each port contributing to the net flow. The results suggest that strong port interactions occur. CFD simulations showed qualitative agreement with measurements but underestimated the flow maldistribution.
CitationArias-García, A., Benjamin, S., Zhao, H., and Farr, S., "A Comparison of Steady, Pulsating Flow Measurements and CFD Simulations in Close Coupled Catalysts," SAE Technical Paper 2001-01-3662, 2001, https://doi.org/10.4271/2001-01-3662.
General Emissions and Gasoline Emission Control Systems
Number: SP-1644; Published: 2001-09-24
Number: SP-1644; Published: 2001-09-24
- Howitt, J. S., Sekella, T. C., “Flow Effects in Monolithic Honeycomb Automotive Catalytic Converters”, Society of Automotive Engineers, Automotive Engineering Congress, Detroit, Mich. February 25-March 1, 1974. SAE Paper No.740244.
- Lemme, C. D., Givens, W. R., “Flow Through Catalytic Converters - An Analytical and Experimental Treatment”, February 25-March 1, 1974. SAE Paper No.740243.
- Comfort, E. H., “Monolithic Catalytic Converter Performance as a Function of Flow Distribution”, The American Society of Mechanical Engineers, 1974.
- Wendland, D. W. and Matthes W.R. Visualization of Automotive Catalytic Converter Internal Flows SAE paper 861554, 1986
- Jorgensen, N., Davies, M.J., Dewhurst, S. J., and Goatcher, T., “Visualising Flow Distributions Through Catalytic Converters” 25th International Symposium on Automotive Technology and Automation, 1992
- Will, N. S., Bennett, C. J., “Flow Maldistributions in Automotive Converter Canisters and their Effect on Emission Control”, SAE Paper No.922339.
- Weltens H., Bressler H., Terres F., Neumaier H. and Rammoser D., Optimisation of catalytic converter gas flow distribution by CFD. SAE paper 930780, 1993.
- Clarkson, R. J., “A Theoretical and experimental study of automotive catalytic converters”, PhD Thesis, Coventry University 1995.
- Wendland, D. W., Kreacher J.E. and Andersey E. Reducing Catalytic Converter Pressure Loss with Enhanced Inlet -Header Diffusion SAE paper 952398 SP-1120 pp13-23, 1995
- Zhao, F-Q., Li, L., Xie, X., Lai, M-C., “An Experimental Study of the Flow Structure Inside the Catalytic Converter of a Gasoline Engine”, SAE Paper No.950784.
- Hawang, K., Lee, K., Mueller, J., Stuecken, T., Schock, H. J., “Dynamic Flow Study in a Catalytic Converter Using Laser Doppler Velocimetry and High Speed Flow Visualisation”, International Congress and Exposition, Detroit, Michigan, February 27-March 2, 1995. SAE Paper No.950786.
- Bressler, H., Rammonser, D., Neumaier, H., Terres, F., “Experimental and Predictive Investigation of a Close Coupled Catalyst Converter with Pulsating Flow”, Heinrich Gillet GmbH & Co.1996. SAE Paper No 960564
- Benjamin S. F., Clarkson R. J., Haimad N. and Girgis N. S.(1996) An experimental and predictive study of the flow in axisymmetric automotive exhaust catalyst systems SAE Transactions, Vol. 105, Journal of Fuels and Lubricants, Section 4, pages 1008-1019
- Haimad N A theoretical and experimental investigation of the flow performance of automotive catalytic converters. . PhD thesis, Coventry University, 1997.
- Jeong S.J. and Kim T. H. CFD investigation of the 3-Dimensional Unsteady Flow in the Catalytic Converter SAE paper 971025, 1997
- Zhao, F-Q., Bai, L., Liu, Y., Chue, T-H., Lai, M-C., “Transitient Flow Characteristics Inside the Catalytic Converter of a Firing Gasoline Engine”, International Congress and Exposition, Detroit, Michigan, February 24-27, 1997. SAE Paper No.971014.
- Park, S-B., Kim, H-S., Cho, K-M., Kim, W-T., “An Experimental and Computational Study of Flow Characteristics in Exhaust Manifold and CCC (Close-Coupled Catalyst), SAE Paper No.980128.
- Bai, L., Zhao, F-Q., Liu, Y., Lai, M-C., Lee, K-S.,“Transient Flow and Pressure Characteristics inside a Close-Coupled Catalytic Converter”, Society of Automotive Engineers, Inc., 1998.SAE Paper No.982548.
- Park, S-B., Kim, H-S., Cho, K-M., Kim, W-T., “An Experimental and Computational Study of Flow Characteristics in Exhaust Manifold and CCC (Close-Coupled Catalyst)”, Society of Automotive Engineers, Inc, 1998. SAE Paper No.980128.
- Cho, Y-S., et al, “Flow Distribution in a Close-Coupled Catalytic Converter”, SAE Paper No.982552
- Wollin, J., Benjamin, S., F., “A Study of the Flow Performance of Ceramic Contoured Substrates for Automotive Exhaust Catalyst Systems” SAE Transactions, Vol. 108, Journal of Fuels and Lubricants, Section 4, pages 2014-2021, 1999
- Shuai S-J, Wang J-X, Zhuang R-J and Chen J-R. Study on Flow Characteristics of Automotive Catalytic Converters with Various Configurations SAE paper 2000-01-0208, SP-1533 pp 41-51, 2000
- Benjamin S. F., Roberts C. A. and Wollin J A Study of the effect of flow pulsations on the flow distribution within ceramic contoured catalyst substrates SAE 2001-01-1996, Spring F&L meeting, Orlando
- TSI Inc. Fluid Mechanics Instrument Division, - IFA Constant Temperature Anemometer System, Instruction Manual, Part no 1990746, May 1997.
- Mendoca J. “Close Couple Catalyst Flow Study”. Final year report, Coventry University, 2000.
- Benjamin S. F., Haimad N, Roberts C. A. and Wollin J Modelling the flow distribution through automotive catalytic converters Proc Inst MechE, Vol 215, Part C Journal of Mechanical Sciences 2001, pp379-383.