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Enhancement of Aircraft Wake-Vortex Decay in Ground Proximity - Experiment versus Simulation

Stephan, Anton and Holzäpfel, Frank and Misaka, Takashi and Geisler, Reinhard and Konrath, Robert (2014) Enhancement of Aircraft Wake-Vortex Decay in Ground Proximity - Experiment versus Simulation. CEAS Aeronautical Journal, 5 (2), pp. 109-125. Springer. DOI: 10.1007/s13272-013-0094-8 ISSN 1869-5582

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Official URL: http://link.springer.com/article/10.1007/s13272-013-0094-8

Abstract

Aircraft wake vortex evolution in ground proximity is investigated experimentally in a water towing tank, as well as numerically with wall-resolved large eddy simulation (LES). With these complementary instruments the enhancement of wake vortex decay by obstacles, introduced at the ground surface, is analyzed. The experimental methods include time-resolved stereo particle image velocimetry and vortex core visualization. For comparison with the experiment, the LES considers the turbulent wake of the strut, holding the towed aircraft model. Wake vortex trajectories and circulation decay are compared at different distances from the obstacle. Tracers are employed to visualize the obstacle’s effects on the vortex core, in LES and experiment. The experimentally obtained trajectories and decay characteristics are reproduced qualitatively by simulations, whereas the agreement is degraded at later times. Beyond that, the vortex dynamics, deduced from the LES results, help to understand the experimental observations. The obstacles trigger helical secondary vortex structures, propagating along the primary vortices. The observed propagation speed of the helical disturbance is fairly well predicted by the suggested simple model. It is shown that the obstacles significantly modify the vortex interaction with the ground and substantially accelerate vortex decay. Two neighboring obstacles lead to colliding disturbances that further enhance vortex decay rates.

Item URL in elib:https://elib.dlr.de/85213/
Document Type:Article
Additional Information:Published online: 27. Novemver 2013
Title:Enhancement of Aircraft Wake-Vortex Decay in Ground Proximity - Experiment versus Simulation
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Stephan, AntonDLR, IPAUNSPECIFIED
Holzäpfel, FrankDLR, IPAUNSPECIFIED
Misaka, Takashimisaka (at) edge.ifs.tohoku.ac.jpUNSPECIFIED
Geisler, Reinhardreinhard.geisler (at) dlr.deUNSPECIFIED
Konrath, Robertrobert.konrath (at) dlr.deUNSPECIFIED
Date:2014
Journal or Publication Title:CEAS Aeronautical Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:5
DOI :10.1007/s13272-013-0094-8
Page Range:pp. 109-125
Publisher:Springer
ISSN:1869-5582
Status:Published
Keywords:Wake vortex flow, Ground effect, Decay enhancement, Large eddy simulation, Towing tank, Particle image velocimetry, Obstacles
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Air Traffic and Weather (old), L - Wake Vortices (old)
Location: Göttingen , Oberpfaffenhofen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Institute of Atmospheric Physics > Transport Meteorology
Deposited By: Ziegele, Brigitte
Deposited On:15 Nov 2013 21:24
Last Modified:06 Sep 2019 15:24

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