The inclusion of flow-acoustic interaction effects in linear acoustic multiport models has been studied. It is shown, using a T-junction as illustration example, that as long the acoustic system is linear the required information is included in a scattering matrix obtained by experimental or numerical studies. Assuming small Mach numbers and low frequencies-as in most automotive silencer applications-the scattering matrix for the T-junction can be approximated using quasi-steady models. Models are derived that holds for all possible configurations of grazing and bias flow in the T-junctions. The derived models are then used to predict the performance of a novel silencer concept, where a resonator is formed by acoustically short-circuiting the inlet and outlet ducts of a flow reversal chamber. The agreement between experiments and simulations is excellent, justifying the use of the quasi-steady modeling approach.


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    Titel :

    Aeroacoustics of Duct Branches-With Application to Silencers


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Abom, Mats (Autor:in) / Karlsson, Mikael (Autor:in) / Glav, Ragnar (Autor:in)

    Kongress:

    10th International Conference on Engines & Vehicles ; 2011



    Erscheinungsdatum :

    2011-09-11




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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