CFD analysis of the effect of the exhaust manifold design on the close-coupled catalytic converter performance

• Autorzy: Martinez-Martinez S. , Leal-Garza R. D. , Sanchez-Cruz F. A. , Villarreal E. B. , Amado-Covarrubias M.
• Języki publikacji: EN

Abstrakty

EN

It is a common practice to mount a catalytic converter directly at the outlet of the exhaust manifold in order to reduce the cold start emissions from the automotive engines by improving the light-off time. The so called Close-Coupled Converter, because of its nearness to the engine, is more exposed to non-uniform fluid flows comingfrom the individual manifold runners, what frequently yields a stream of gases flowing mainly through a section of the monolith causing the aging of the catalyst and low conversion efficiency, among other negative effects. Computational Fluid Dynamics (CFD) has became a very useful and widely used tool to analyze and optimize this kind of exhaust after-treatment systems in a relatively fast and accurate way for design purposes. There are several designs of exhaust manifolds whose shape and dimensions are mainly restricted not only by the engine characteristics but by the space constraints of the particular vehicles they are designedfor. In this work the commercial CFD code ANSYS FLUENT was used to evaluate and compare the effect of three shapes of exhaust manifolds on the fluid flow uniformity at the entrance of the Close-Coupled Converter. Pressure drop in the entire Manifold-Converter device is also an important parameter considered for the design evaluation. The manifolds investigated are of type cast, 4-2-1 and L-shaped, which are commonly used in the automotive industry.

Słowa kluczowe

EN

Close-Coupled Catalytic Converter; Exhaust Manifold; flow uniformity; pressure drop

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2010
• Tom: Vol. 17, No. 4
• Strony: 303--311
• Opis fizyczny: Bibliogr. 12 poz., rys.

Twórcy

autor

Martinez-Martinez S.

autor

Leal-Garza R. D.

autor

Sanchez-Cruz F. A.

autor

Villarreal E. B.

autor

Amado-Covarrubias M.

• Facultad de Ingenieria Mecanica y Electrica Universidad Autónoma de Nuevo Leon Pedro de Alba s/n, Apdo. Postal 076 Suc. F, CP, 66450, San Nicolas de los Garza, N.L., Mexico tel: [phone], fax: [phone],

Bibliografia

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• [8] Salasc, S., Barrieu, E., Leroy, V., Impact of Manifold Design on Flow Distribution of a Close- Coupled Catalytic Converter, SAE Paper 2005-01-1626, 2005.
• [9] Weltens, H., Bressler, H., Terres, F., Neumaier, H., Rammoser, D., Optimisation of Catalytic Converter Gas Flow Distribution by CFD Prediction, SAE Paper 930780, 1993.
• [10] White, F. M., Viscous Fluid Flow, McGraw Hill, Third Edition, 2006.
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