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Catalytic Converter Design, Development & Optimisation using Computational Analysis and Engineering
ISSN: 0148-7191, e-ISSN: 2688-3627
Published January 13, 1999 by The Automotive Research Association of India in India
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Computational Analysis and Engineering using P-Cat, WAVE, HeatCad, Computational Fluid Dynamics (CFD) and Finite Element Analysis (FEA) are sequentially applied to design, develop, and optimize catalytic converter. P-Cat is used to estimate back pressure due to substrates, end cones, and inlet/outlet pipes. WAVE simulation is used to predict the exhaust system back pressure from the engine headface to tail pipe to estimate engine performance. Heatcad, a transient heat transfer analysis is used to simulate the temperature response in the exhaust system to locate the catalytic converter to achieve maximum performance. Heatcad analysis provides the easy way to identify thermal management issues and to design and optimize the runner lengths, material thicknesses of the manifold and downpipes. Computational Fluid Dynamics (CFD) analysis, a powerful means of simulating complex fluid flow situations in the exhaust system, is used to design the converter inlet, outlet cones and the downpipes to obtain uniform exhaust gas flow to achieve maximum converter performance and reduce mat erosion. The uniformity index, velocity index (eccentricity) and pressure drop index predicted are used to optimize the geometry and orientation of the converter components. CFD analysis using heat transfer analysis with chemical reaction is used to identify and optimize insulation mounting material to achieve the targeted converter external shell skin temperature. Finite Element Analysis (FEA) is used to predict structural mechanics and structural dynamics of the full exhaust system to give insight about the thermal fatigueness of the converter assembly. Heat transfer analysis performed with thermal, mechanical and road load conditions is used to predict the static and vibrational stresses of the converter components. It also provides information to design the converter shell structure, cone geometry and material selection. FEA analysis using Explicit code is used to simulate the converter assembly process and to optimize manufacturing tool geometry.
- S. Rajadurai - Tenneco Automotive Engineering Center, Grass Lake, USA
- L. Geer - Tenneco Automotive Engineering Center, Grass Lake, USA
- H. Chang - Tenneco Automotive Engineering Center, Grass Lake, USA
- C. Chung - Tenneco Automotive Engineering Center, Grass Lake, USA
- F. Pan - Tenneco Automotive Engineering Center, Grass Lake, USA
CitationRajadurai, S., Geer, L., Chang, H., Chung, C. et al., "Catalytic Converter Design, Development & Optimisation using Computational Analysis and Engineering," SAE Technical Paper 990050, 1999, https://doi.org/10.4271/990050.
- Locker, R.J. Sawyer, C.B. “Qualification of ceramic pre-converter hot vibration and durability,” SAE 960563
- Ryan, M.J. Becker, E.R. Zygourakis, K. “light-off performance of catalytic converters, The effect of heat / mass transfer characteristics,” SAE 910610
- John D. Eyck Ten “Monolithic catalytic converter mounting arrangement,” Sep. 5 1989
- Robertson, D.F. “A study of thermal energy conservation in exhaust pipes,” SAE 790307 1979
- Wendland, D. W. “Automotive exhaust system steady state heat transfer,” SAE 931085 1993
- Chen, D. K. S. “A numerical model for thermal problems in exhaust systems,’ SAE 931070
- Incropera, F. P. Dewitt, D. P. Fundamentals of heat and mass transfer Third John Wiley & Sons 1990
- Ball, D. J. “Distribution of warm-up and underfloor catalyst volumes,” SAE 922338 San Francisco, California 1992
- Zucrow, M. J. Hoffman, J. D. “Gas Dynamics,” 1 John Wiley and Sons 1976
- Bressler, H. Rammoser, D. Neumaier, H. Terres. F. “Experimental and predictive investigation of a close coupled converter with pulsating flow,” SAE 960564 1996