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Three-dimensional reconstruction of blade tip vortices of a BO 105 using a multi-camera BOS system

Bauknecht, André and Ewers, Benjamin and Wolf, Claus and Raffel, Markus and Leopold, Friedrich (2014) Three-dimensional reconstruction of blade tip vortices of a BO 105 using a multi-camera BOS system. 70th Annual Forum of the American Helicopter Society, 20. - 22. Mai 2014, Montreal, Canada.

Full text not available from this repository.

Official URL: http://vtol.org/annual-forum/forum-70/forum-70

Abstract

Noise and structural vibrations in rotorcraft are strongly influenced by interactions between blade tip vortices and the structural components of a helicopter. As a result, the three-dimensional localization of vortices is highly desirable, especially for the case of full-scale helicopters under realistic flight conditions. In the current study, we present results from a flight test with a full-scale BO 105 in an open pit mine. A background-oriented schlieren measurement system consisting of ten cameras was used with a natural background to visualize the vortices of the helicopter under maneuvering flight. Vortex filaments could be visualized and extracted up to a vortex age of 360°. Vortex instability effects were found for several flight conditions. Due to the large test dimensions, an iterative approach based on points on the helicopter fuselage was applied for the camera calibration. Point correspondence between vortex curves in the evaluated images was established by means of epipolar geometry. A three-dimensional reconstruction of the main part of the vortex system was carried out for the first time using triangulation-based stereo-photogrammetry. A quantitative evaluation of the 3D vortex system was carried out, demonstrating the potential of the multi-camera background-oriented schlieren measurement technique for the analysis of blade-vortex interaction effects in rotorcraft.

Item URL in elib:https://elib.dlr.de/85450/
Document Type:Conference or Workshop Item (Speech)
Title:Three-dimensional reconstruction of blade tip vortices of a BO 105 using a multi-camera BOS system
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bauknecht, Andréandre.bauknecht (at) dlr.deUNSPECIFIED
Ewers, Benjaminbenjamin.ewers (at) dlr.deUNSPECIFIED
Wolf, Clauschristian.wolf (at) dlr.deUNSPECIFIED
Raffel, Markusmarkus.raffel (at) dlr.deUNSPECIFIED
Leopold, FriedrichISL, FranceUNSPECIFIED
Date:2014
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-12
Series Name:Conference Proceedings,on CD-ROM
Status:Published
Keywords:BOS, Background Oriented Schlieren, Flight test, Flugversuch, 3D reconstruction, Vortices, Wirbel
Event Title:70th Annual Forum of the American Helicopter Society
Event Location:Montreal, Canada
Event Type:international Conference
Event Dates:20. - 22. Mai 2014
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
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Deposited By: Micknaus, Ilka
Deposited On:10 Jun 2014 16:52
Last Modified:17 Feb 2015 14:24

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