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Aerodynamic Contrails: Phenomenology and Flow Physics

Gierens, Klaus Martin and Kärcher, Bernd and Mannstein, Hermann and Mayer, Bernhard (2009) Aerodynamic Contrails: Phenomenology and Flow Physics. Journal of the Atmospheric Sciences, 66, pp. 217-226. American Meteorological Society. DOI: 10.1175/2008JAS2767.1

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Official URL: http://ams.allenpress.com/perlserv/?request=get-archive&issn=1520-0469

Abstract

Aerodynamic contrails have been recognized for a long time although they appear sporadically. Usually one observes them under humid conditions near the ground, where they are short-lived phenomena. Aerodynamic contrails appear also at cruise levels where they may persist when the ambient atmosphere is ice supersaturated. The present paper presents a theoretical investigation of aerodynamic contrails in the upper troposphere. The required flow physics are explained and applied to a case study. Results show that the flow over aircraft wings leads to large variations of pressure and temperature. Average pressure differences between the upper and lower sides of a wing are on the order of 50 hPa, which is a quite substantial fraction of cruise-level atmospheric pressures. Adiabatic cooling exceeds 20 K about 2 m above the wing in a case study shown here. Accordingly, extremely high supersaturations (exceeding 1000%) occur for a fraction of a second. The potential consequences for the ice microphysics are discussed. Because aerodynamic contrails are independent of the formation conditions of jet contrails, they form an additional class of contrails that might be complementary because they form predominantly in layers that are too warm for jet contrail formation.

Item URL in elib:https://elib.dlr.de/58309/
Document Type:Article
Title:Aerodynamic Contrails: Phenomenology and Flow Physics
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gierens, Klaus MartinUNSPECIFIEDUNSPECIFIED
Kärcher, BerndUNSPECIFIEDUNSPECIFIED
Mannstein, HermannUNSPECIFIEDUNSPECIFIED
Mayer, BernhardUNSPECIFIEDUNSPECIFIED
Date:February 2009
Journal or Publication Title:Journal of the Atmospheric Sciences
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:66
DOI :10.1175/2008JAS2767.1
Page Range:pp. 217-226
Publisher:American Meteorological Society
Status:Published
Keywords:Aviation, contrails, aerodynamics, method of singularities
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:ATM and Operation (old)
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation
DLR - Research theme (Project):L - Human Factors and Safety in Aeronautics (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics
Deposited By: Gierens, Dr.rer.nat. Klaus Martin
Deposited On:16 Mar 2009
Last Modified:06 Sep 2019 15:27

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