The flow in a duct following a sudden change in section is described herein. Sonic flow through a convergent nozzle expands into a larger cross section to produce a mixed supersonic flow, and a low base pressure in the upstream corners. Under certain pressure conditions, oscillations occur in the duct and excessive externally generated noise results. These self-excited oscillations are caused by a boundary-layer/shock-wave interaction, and can exist in both circular and rectangular ducts. Many types of oscillations have been observed in different test arrangements, and a complete description of the flow is given. (DePo)


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    Titel :

    Oscillations of the supersonic flow downstream of an abrupt increase in duct cross section


    Weitere Titelangaben:

    Schwingungen von Ueberschallstroemungen bei ploetzlichen Aenderungen des Kanalquerschnittes


    Beteiligte:
    Anderson, J.S. (Autor:in) / Meier, G.E. (Autor:in) / Grabitz, G. (Autor:in) / Jungowski, W.M. (Autor:in) / Witczak, K.J. (Autor:in)

    Erschienen in:

    AIAA Journal ; 18 , 4 ; 394-395


    Erscheinungsdatum :

    1980


    Format / Umfang :

    2 Seiten, 4 Bilder, 4 Quellen



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    Oscillations of the Supersonic Flow Downstream of an Abrupt Increase in Duct Cross Section

    G.E.A. Meier / G. Grabitz / W.M. Jungowski et al. | AIAA | 1980



    Oscillations of the supersonic flow downstream of an abrupt inccrease in duct cross-section

    Meier, Gerd E. A. / Grabitz, G. | GWLB - Gottfried Wilhelm Leibniz Bibliothek | 1978


    Sonic flow through an abrupt change in cross-section

    Anderson, J.S. / Meier, G.E. | Tema Archiv | 1984


    Numerical Study of Aeroacoustic Oscillations in Transonic Flow Downstream a Sudden Duct Enlargement

    Emmert, Thomas / Lafon, Philippe / Bailly, Christophe | AIAA | 2006