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Blade tip vortex detection in maneuvering flight using the Background Oriented Schlieren (BOS) technique

Bauknecht, Andre and Merz, Christoph B. and Landolt, Andrin and Meier, Alexander H. and Raffel, Markus (2013) Blade tip vortex detection in maneuvering flight using the Background Oriented Schlieren (BOS) technique. AHS 69th Annual Forum and Technology Display "Advancing Vertical Flight Technology in Demanding Environments", 21. - 23. May 2013, Phoenix, Arizona, USA.

Full text not available from this repository.

Official URL: http://www.as.go.dlr.de/HK/pmwiki/uploads/AHS2013/isv7/default2.htm

Abstract

The background oriented Schlieren (BOS) technique was used to visualize the blade tip vortices of a Eurocopter AS532UL Cougar helicopter in maneuvering flight. The test program included a wide range of maneuvers covering a large part of the flight envelope such as hover, 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 BOS method, the detection of vortex filaments up to vortex ages of 540° is possible. The visualization of the vortex system is used to detect aerodynamic phenomena like blade vortex interactions (BVI), vortex airframe interactions and the occurrence of smooth sinuous disturbances. A detailed description of the applied reference-free BOS setup is given and the suitability of different natural backgrounds for the BOS method is analyzed.

Item URL in elib:https://elib.dlr.de/78098/
Document Type:Conference or Workshop Item (Speech)
Title:Blade tip vortex detection in maneuvering flight using the Background Oriented Schlieren (BOS) technique
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bauknecht, AndreUNSPECIFIEDUNSPECIFIED
Merz, Christoph B.UNSPECIFIEDUNSPECIFIED
Landolt, AndrinETH Zürich, Institut für FluiddynamikUNSPECIFIED
Meier, Alexander H.ETH Zürich, Institut für FluiddynamikUNSPECIFIED
Raffel, MarkusUNSPECIFIEDUNSPECIFIED
Date:2013
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-13
Series Name:Conference Proceedings digital
Status:Published
Keywords:Inflight BOS, Background Oriented Schlieren, Flight Test, Flugversuch, Blade Tip Vortices, Blattspitzenwirbel
Event Title:AHS 69th Annual Forum and Technology Display "Advancing Vertical Flight Technology in Demanding Environments"
Event Location:Phoenix, Arizona, USA
Event Type:international Conference
Event Dates:21. - 23. May 2013
Organizer:AHS
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Rotorcraft (old)
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: Bauknecht, Andre
Deposited On:27 May 2013 12:38
Last Modified:08 May 2014 23:17

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