Knowledge about the distribution of turbine exhaust behind aircraft, namely the entrainment into the wingtip vortices, the subsequent detrainment by baroclinicity and turbulence when the vortex pair descends in a stably stratified atmosphere, and the mixing when the vortices collapse, is requisite for understanding the chemical and microphysical processes in the aircraft wake and, hence, for assessing the impact of aircraft emissions on the atmosphere. By means of a vortex-filament technique and large-eddy simulations dynamics are discussed which control the distribution of the exhaust of a subsonic aircraft under cruising conditions from the nozzle exit to the distance where the trailing vortex pair starts to collapse into turbulence. Emphasis is first put on the method; second on the initial roll-up process and the phenomenon of 'non-entrainment' of exhaust into the vortex cores. Third, the role of turbulence on the onset of the wingtip-vortex decay is considered; thereby it is distinguished between background atmospheric turbulence and turbulence steming from the boundary-layer around the aircraft.


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    Titel :

    Wake dynamics and exhaust distribution behind cruising aircraft


    Weitere Titelangaben:

    Nachlaufdynamik und Abgasverteilung hinter Luftfahrzeugen im Reiseflug


    Beteiligte:
    Gerz, T. (Autor:in) / Ehret, T. (Autor:in)


    Erscheinungsdatum :

    1996


    Format / Umfang :

    12 Seiten, 9 Bilder, 3 Tabellen, 30 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Wake Dynamics and Exhaust Distribution behind Cruising Aircraft

    Gerz, T. / Ehret, T. / Advisory Group for Aerospace Research and Development; Fluid Dynamics Panel | British Library Conference Proceedings | 1996


    Stability Theory for Two Wingtip Vortices Behind Cruising Aircraft

    Ehret, T. / Advisory Group for Aerospace Research and Development; Fluid Dynamics Panel | British Library Conference Proceedings | 1996


    Hybrid numerical simulation of the jet-wake-vortex interaction of a cruising aircraft

    Stephan, Anton / Rohlmann, David / Holzäpfel, Frank N. et al. | AIAA | 2018


    Analytic Platforms in Cruising Aircraft

    JAMES L. FARRELL | AIAA | 1967


    Analytic platforms in cruising aircraft

    Farrell, J.L. | Engineering Index Backfile | 1967