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Far field wake vortex evolution of two aircraft formation flight and implications on young contrails

Unterstraßer, Simon and Stephan, Anton (2020) Far field wake vortex evolution of two aircraft formation flight and implications on young contrails. The Aeronautical Journal, 124 (1275), pp. 667-702. Cambridge University Press. doi: 10.1017/aer.2020.3. ISSN 0001-9240.

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Official URL: https://doi.org/10.1017/aer.2020.3

Abstract

Large-eddy simulations (LES) have been employed to investigate the far-field four-vortex wake vortex evolution over 10min behind an aircraft formation. In formation flight scenarios, the wake vortex behaviour was found to be much more complex, chaotic and also diverse than in the classical single aircraft case, depending very sensitively on the formation geometry, i.e. the lateral and vertical offset of the two involved aircraft. Even though the case-by-case variability of the wake vortex behaviour across the various formation flight scenarios is large, the final plume dimensions after vortex dissolution are in general substantially different from those of single aircraft scenarios. The plumes are around 170 to 250m deep and 400m to 680m broad, whereas a single A350/B777 aircraft would produce a 480m deep and 330m broad plume. Formation flight plumes are thus not as deep, yet they are broader, as the vortices do not only propagate vertically but also in span-wise direction. Two different LES models have been employed independently and show consistent results suggesting the robustness of the findings. Notably, C02 emissions are only one contribution to the aviation climate impact among several others like contrails and emission of water vapour and nitrogen oxides, which would be all affected by the implementation of formation flight. Thus, we also highlight the differences in ice microphysical and geometrical properties of young formation flight contrails relative to the classical single aircraft case.

Item URL in elib:https://elib.dlr.de/134917/
Document Type:Article
Title:Far field wake vortex evolution of two aircraft formation flight and implications on young contrails
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Unterstraßer, SimonDLR, IPAhttps://orcid.org/0000-0003-3772-3678
Stephan, AntonDLR, IPAUNSPECIFIED
Date:2020
Journal or Publication Title:The Aeronautical Journal
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:124
DOI :10.1017/aer.2020.3
Page Range:pp. 667-702
Publisher:Cambridge University Press
ISSN:0001-9240
Status:Published
Keywords:formation flight, wake vortex, green aviation, large-eddy simulation, Lagrangian ice microphysics, contrail,
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:air traffic management and operations
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation
DLR - Research theme (Project):L - Climate, Weather and Environment (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Transport Meteorology
Deposited By: Unterstraßer, Dr. Simon
Deposited On:15 May 2020 15:34
Last Modified:15 May 2020 15:34

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