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.
Wake dynamics and exhaust distribution behind cruising aircraft
Nachlaufdynamik und Abgasverteilung hinter Luftfahrzeugen im Reiseflug
1996
12 Seiten, 9 Bilder, 3 Tabellen, 30 Quellen
Conference paper
English
Flugzeug , Dynamik , Abgasströmung , Strömungsverteilung , Turbulenz , Mischen , Abgasemission , Wirbelfaden (Strömung) , Simulation , Düse , Wirbelkern , Tragflügel , Grenzschicht
Wake Dynamics and Exhaust Distribution behind Cruising Aircraft
British Library Conference Proceedings | 1996
|Stability Theory for Two Wingtip Vortices Behind Cruising Aircraft
British Library Conference Proceedings | 1996
|Analytic Platforms in Cruising Aircraft
AIAA | 1967
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Engineering Index Backfile | 1967
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