The emissions performance of a prototype close-coupled catalyst system has been analysed and compared with semi-close-coupled and underfloor systems.Under certain engine conditions during the stabilized region of the ECE Stage 3 drive-cycle, the close-coupled system has showed higher emissions than the semi-close-coupled or underfloor configurations. Using fast response emissions analysers and catalyst warm-up characteristics in conjunction with Computational Fluid Dynamics (CFD), the reasons for this emissions performance deficit has been attributed to flow maldistribution across the front face of the catalyst.Two flow distribution-related mechanisms for emissions breakthrough have been isolated: radial variations in mean AFR (Air-Fuel Ratio) across the catalyst can cause localized emissions breakthrough due to cylinder-to-cylinder AFR variations; and under high space velocity conditions, localized breakthrough can occur due to radial variations in gas velocity through the catalyst.


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    Titel :

    Effect of Catalyst Inlet Cone Flow Mal-Distribution on Emissions Performance of a Close-Coupled Catalytic Converter


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Finch, Alex (Autor:in) / Hitchings, Andrew (Autor:in) / Campbell, Bruce (Autor:in) / Gregory, David (Autor:in) / Lloyd-Thomas, David (Autor:in) / Marsh, Mark (Autor:in) / Tancell, Paul (Autor:in)

    Kongress:

    SAE 2004 World Congress & Exhibition ; 2004



    Erscheinungsdatum :

    2004-03-08




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Effect of Catalyst Inlet Cone Flow Mal-Distribution on Emissions Performance of a Close-Coupled Catalytic Converter

    Campbell, B. / Finch, A. / Tancell, P. et al. | British Library Conference Proceedings | 2004



    2004-01-1489 Effect of Catalyst Inlet Cone Flow Mal-Distribution on Emissions Performance of a Close-Coupled Catalytic Converter

    Campbell, B. / Finch, A. / Tancell, P. et al. | British Library Conference Proceedings | 2004


    Flow Distribution in a Close-Coupled Catalytic Converter

    Kim, Duk-Sang / Lee, Jong-Hwa / Min, Kyoung-Doug et al. | SAE Technical Papers | 1998


    Flow distribution in a close-coupled catalytic converter

    Cho,Y.S. / Kim,D.S. / Han,M. et al. | Kraftfahrwesen | 1998