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Blade-Tip Vortex Detection in Maneuvering Flight Using the Background-Oriented Schlieren Technique

Bauknecht, Andre and Merz, Christoph B. and Raffel, Markus and Landolt, Andrin and Meier, Alexander H. (2014) Blade-Tip Vortex Detection in Maneuvering Flight Using the Background-Oriented Schlieren Technique. Journal of Aircraft, 51 (6), pp. 2005-2014. American Institute of Aeronautics and Astronautics (AIAA). doi: 10.2514/1.C032672. ISSN 0021-8669.

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Official URL: http://arc.aiaa.org/doi/abs/10.2514/1.C032672


The background-oriented schlieren technique was used to visualize the blade-tip vortices of a Eurocopter AS532UL Cougar helicopter in maneuvering flight. The test program covered a large part of the flight envelope, including maneuvers such as hover flight, fast forward flight, flare maneuvers, and high-speed turns. For selected flight conditions, the aerodynamic results are presented here. It is shown that, with the reference-free background-oriented schlieren method, the detection of vortex filaments up to vortex ages of 540 deg is possible. The visualization of the vortex system is used to detect aerodynamic phenomena such as blade–vortex interactions, vortex–airframe interactions, and the occurrence of smooth sinuous disturbances. A detailed description of the applied reference-free background-oriented schlieren setup is given, and the suitability of different natural backgrounds for the background-oriented schlieren method is analyzed.

Item URL in elib:https://elib.dlr.de/89120/
Document Type:Article
Additional Information:Published online: 29 April 2014
Title:Blade-Tip Vortex Detection in Maneuvering Flight Using the Background-Oriented Schlieren Technique
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Bauknecht, Andreandre.bauknecht (at) dlr.deUNSPECIFIED
Merz, Christoph B.christoph.merz (at) dlr.deUNSPECIFIED
Raffel, Markusmarkus.raffel (at) dlr.deUNSPECIFIED
Landolt, AndrinETH Zürich, Institut für FluiddynamikUNSPECIFIED
Meier, Alexander H.ETH Zürich, Institut für FluiddynamikUNSPECIFIED
Journal or Publication Title:Journal of Aircraft
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.2514/1.C032672
Page Range:pp. 2005-2014
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
Series Name:November–December 2014
Keywords:blade-tip vortices, background-oriented schlieren, Maneuvering Flight
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Virtual Aerodynamic Rotorcraft (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Deposited By: Micknaus, Ilka
Deposited On:08 Dec 2014 12:40
Last Modified:08 Mar 2018 18:41

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