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

Bauknecht, Andre and Ewers, Benjamin and Wolf, Christian C. and Leopold, Friedrich and Yin, Jianping and Raffel, Markus (2015) Three-dimensional reconstruction of helicopter blade-tip vortices using a multi-camera BOS system. Experiments in Fluids, 56 (1), pp. 1-13. Springer. DOI: 10.1007/s00348-014-1866-6 ISSN 0723-4864

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Official URL: http://link.springer.com/article/10.1007/s00348-014-1866-6

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 with a natural background was used to visualize the vortices of the helicopter during 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. For the camera calibration, an iterative approach based on points on the helicopter fuselage was applied. 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 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/89867/
Document Type:Article
Additional Information:Published online: 09.12.2014, January 2015, Article:1866, 1432-1114 (Online)
Title:Three-dimensional reconstruction of helicopter blade-tip vortices using a multi-camera BOS system
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bauknecht, Andreandre.bauknecht (at) dlr.deUNSPECIFIED
Ewers, Benjaminbenjamin.ewers (at) dlr.deUNSPECIFIED
Wolf, Christian C.christian.wolf (at) dlr.deUNSPECIFIED
Leopold, FriedrichInstitute Franco-Allemand de Recherche de Saint-Luis (ISL)UNSPECIFIED
Yin, Jianpingjianping.yin (at) dlr.deUNSPECIFIED
Raffel, Markusmarkus.raffel (at) dlr.deUNSPECIFIED
Date:2015
Journal or Publication Title:Experiments in Fluids
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:56
DOI :10.1007/s00348-014-1866-6
Page Range:pp. 1-13
Publisher:Springer
ISSN:0723-4864
Status:Published
Keywords:Background-oriented schlieren; BOS; Helicopter; Flight test; Flugversuch; Blade tip vortex; Wirbel; 3D reconstruction
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: Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Deposited By: Micknaus, Ilka
Deposited On:12 Dec 2014 14:11
Last Modified:06 Sep 2019 15:25

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