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Crosswind thresholds supporting wake-vortex-free corridors for departing aircraft

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Dengler, Klaus Holzäpfel, Frank Gerz, Thomas Wiegele, A. De Visscher, Ivan [UCL] Winckelmans, Grégoire [UCL] Bricteux, Laurent [UCL] Konopka, J.

During two field measurement campaigns aircraft wake vortex trajectory and wind measurement data have been collected at Frankfurt airport. Three different approaches have been used to analyse the data in order to estimate crosswind threshold values supporting vortex-free corridors for departing aircraft. Although several competing effects such as wake vortex transport in and out of ground effect, temporal and spatial wind variability, and the spreading of aircraft trajectories after take-off, complicate the analyses, all three approaches lead to similar crosswind thresholds. Employing standard instrumentation at 10 m, a minimum crosswind threshold of 3.5–4.6 m s−1 has been identified to clear a safety corridor of 150 m width from wake vortices with a 95% probability within 60 s. Alternative estimations of crosswind thresholds employing different instrumentation and different height ranges are reported. Crosswind thresholds can be reduced if the wind is measured close to the air mass in which the vortices evolve. A definite crosswind threshold for operational use cannot be deduced solely from this study since critical factors such as risk and safety assessment have not yet been taken into account.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2011
Language Anglais
Journal information "Meteorological Applications" - Vol. 19, p. 289-301 (2012)
Peer reviewed yes
Publisher JohnWiley & Sons Ltd. ((United Kingdom) Bognor Regis)
issn 1350-4827
Publication status Publié
Affiliations Institut für Physik der Atmosphäre, Oberpfaffenhofen,D- 82234 Wessling,Germany - Deutsches Zentrum für Luft- und Raumfahrt (DLR)
UCL - SST/IMMC/TFL - Thermodynamics and fluid mechanics
DFS Deutsche Flugsicherung GmbH, D-63225 Langen, Germany - Research and Development
Keywords Crosswind threshold ; Wake-vortex drift ; Aircraft separation ; Departure corridor ; CREDOS
Links
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Bibliographic reference Dengler, Klaus ; Holzäpfel, Frank ; Gerz, Thomas ; Wiegele, A. ; De Visscher, Ivan ; et. al. Crosswind thresholds supporting wake-vortex-free corridors for departing aircraft. In: Meteorological Applications, Vol. 19, p. 289-301 (2012)
Permanent URL http://hdl.handle.net/2078.1/74639