The function of the inlet header of a catalytic converter is to diffuse the inlet exhaust flow, decreasing its velocity and increasing its static pressure with as little loss in total pressure as possible. In practice, very little diffusion takes place in most catalytic converter inlet headers because the flow separates at the interface of the pipe and the tapered section leading to the substrate. This leads to increased converter pressure loss and flow maldistribution.An improved inlet-header design called the Enhanced Diffusion Header (EDH) was developed which combines a short, shallow-angle diffuser with a more abrupt expansion to the substrate cross section. Tests conducted in room air (cold flow) and engine exhaust showed that improved inlet-jet diffusion leads to substantial reductions in converter restriction. EDH performance was not compromised by the presence of a right-angle bend upstream of the converter.


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    Title :

    Reducing Catalytic Converter Pressure Loss with Enhanced Inlet-Header Diffusion


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    1995 SAE International Fall Fuels and Lubricants Meeting and Exhibition ; 1995



    Publication date :

    1995-10-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Reducing Catalytic Converter Pressure Loss with Enhanced Inlet-Header Diffusion

    Wendland, D. W. / Kreucher, J. E. / Andersen, E. et al. | British Library Conference Proceedings | 1995


    Reducing catalytic converter pressure loss with enhanced inlet-header diffusion

    Wendland,D.W. / Kreucher,J.E. / Andersen,E. et al. | Automotive engineering | 1995



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