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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    Title :

    Wake dynamics and exhaust distribution behind cruising aircraft


    Additional title:

    Nachlaufdynamik und Abgasverteilung hinter Luftfahrzeugen im Reiseflug


    Contributors:
    Gerz, T. (author) / Ehret, T. (author)


    Publication date :

    1996


    Size :

    12 Seiten, 9 Bilder, 3 Tabellen, 30 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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