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| Titel |
Modelling exhaust plume mixing in the near field of an aircraft |
| VerfasserIn |
F. Garnier, S. Brunet, L. Jacquin |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 15, no. 11 ; Nr. 15, no. 11, S.1468-1477 |
| Datensatznummer |
250013010
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| Publikation (Nr.) |
 copernicus.org/angeo-15-1468-1997.pdf |
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| Zusammenfassung |
| A simplified approach has been applied to
analyse the mixing and entrainment processes of the engine exhaust through their
interaction with the vortex wake of an aircraft. Our investigation is focused on
the near field, extending from the exit nozzle until about 30 s after the wake
is generated, in the vortex phase. This study was performed by using an integral
model and a numerical simulation for two large civil aircraft: a two-engine
Airbus 330 and a four-engine Boeing 747. The influence of the wing-tip vortices
on the dilution ratio (defined as a tracer concentration) shown. The mixing
process is also affected by the buoyancy effect, but only after the jet regime,
when the trapping in the vortex core has occurred. In the early wake, the engine
jet location (i.e. inboard or outboard engine jet) has an important influence on
the mixing rate. The plume streamlines inside the vortices are subject to
distortion and stretching, and the role of the descent of the vortices on the
maximum tracer concentration is discussed. Qualitative comparison with contrail
photograph shows similar features. Finally, tracer concentration of inboard
engine centreline of B-747 are compared with other theoretical analyses and
measured data. |
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