Flow measurements are presented across an automotive catalyst monolith situated downstream of a planar wide-angled diffuser. Particle image velocimetry measurements were obtained in the diffuser and the flow distribution within the monolith was obtained from hot wire anemometry at the monolith exit. Flow separation at the diffuser inlet resulted in the formation of a jet that traversed the diffuser before spreading just prior to entering the monolith. The jet featured a potential core and saddle-type velocity profiles. A free shear layer separated the jet core from two large recirculation regions that developed in the diffuser narrowing the potential core. The flow field in the main body of the diffuser was observed to be independent of Re in contrast to that within the monolith. Increasing monolith length gave greater flow uniformity in the monolith as a consequence of jet spreading. Comparing the axial velocity flow profiles about 3 mm upstream of the monolith to that downstream showed that significant flow redistribution occurred as the flow entered the monolith, resulting in more flow entering peripheral channels. It is inferred that pressure loss arising from oblique entry into monolith channels significantly affects the flow distribution within the monolith.


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    Title :

    Flow measurements across an automotive catalyst monolith situated downstream of a planar wide-angled diffuser


    Additional title:

    Strömungsmessungen an einem Autoabgaskatalysator hinter einem ebenen weitwinkeligen Strömungsdiffusor


    Contributors:


    Publication date :

    2010


    Size :

    8 Seiten, 10 Bilder, 19 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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