A zonal approach for the prediction of the far-field radiation from flows in lined ducts is investigated. The approach combines a high-order computational aeroacoustics scheme with the recently developed acoustic intensity-based method for the calculation of far-field radiations. The advantage over the application of an acoustic analogy is the usage of an open control surface for the acoustic input. The capability of the current hybrid approach was validated on the basis of two benchmark cases. One considers the sound radiation from a two-dimensional semiinfinite duct in which a small fraction of the walls close to outlet nozzle is lined. The second problem concerns the sound radiation from a bypass enginelike annular duct with lined and hardwalled configurations of the infinite centerbody and sheared flow conditions. A broadband time-domain impedance boundary condition based on the extended Helmholtz resonator model and the Ingard-Myers boundary condition is implemented in the computational aeroacoustic code to model the acoustic linings. Although mesh refinement may improve the solutions, the good agreements of analytical solutions and numerical results, in particular for the radiation characteristics, verify this approach as an accurate and efficient prediction tool.


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    Titel :

    Validation of a zonal approach computing the sound radiation from lined ducts


    Weitere Titelangaben:

    Validierung zonaler Näherungsberechnungen der Schallstrahlung von ausgekleideten Kanälen


    Beteiligte:
    Buske, Clemens (Autor:in) / Richter, Christoph (Autor:in) / Thiele, Frank (Autor:in) / Yu, Chao (Autor:in) / Zhuang, Mei (Autor:in)

    Erschienen in:

    AIAA Journal ; 48 , 12 ; 2899-2908


    Erscheinungsdatum :

    2010


    Format / Umfang :

    10 Seiten, 14 Bilder, 6 Tabellen, 23 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch





    Validation of a Zonal Approach Computing the Sound Radiation from Lined Ducts

    Buske, Clemens / Richter, Christoph / Thiele, Frank et al. | AIAA | 2010


    Validation of a Zonal Method Computing the Sound Radiation from Lined Ducts

    Buske, Clemens / Richter, Christoph / Thiele, Frank et al. | AIAA | 2009


    Sound propagation in acoustically lined elliptical ducts

    Oliveira, J.M.G.S. | Online Contents | 2014