In this work, scattering and shielding of the tonal noise from contrarotating open rotors by surrounding parts are investigated. The computational tool chain is based on unsteady Reynolds-averaged Navier–Stokes simulations providing permeable integration surface data for a Ffowcs Williams and Hawkings-type evaluation (“Sound Generated by Turbulence and Surfaces in Arbitrary Motion,” Philosophical Transactions of the Royal Society of London, Series A: Mathematical and Physical Sciences, Vol. 264, No. 1151, 1969, pp. 321–342), which is coupled with a fast multipole boundary-element method to account for shielding by the airframe. The effect of a background mean flow is taken into account by applying a Lorentz transform to the boundary-element problem and using the Möhring analogy instead of the Ffowcs Williams and Hawkings formulation to obtain the incident acoustic field. Validation of the Möhring/boundary-element coupling method is shown on the basis of a model contrarotating open rotor with shielding geometries and a mounting pylon. The tool chain is then applied to a full-scale open-rotor engine installed in different aircraft tail configurations (T tail, L tail, and U tail) to assess their influence on flyover and lateral noise in takeoff conditions.


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    Titel :

    Numerical Assessment of Open-Rotor Noise Shielding with a Coupled Approach


    Beteiligte:

    Erschienen in:

    AIAA Journal ; 57 , 5 ; 1930-1940


    Erscheinungsdatum :

    01.05.2019




    Medientyp :

    Aufsatz (Konferenz) , Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch