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A Full-Scale Particle Image Velocimetry Investigation of “Young” Rotor Blade Tip Vortices

Kindler, Kolja and Mulleners, Karen and Richard, Hugues and Raffel, Markus (2009) A Full-Scale Particle Image Velocimetry Investigation of “Young” Rotor Blade Tip Vortices. AHS 65th Annual Forum, 2009-05-27 - 2009-05-29, Grapevine, Texas.

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The blade tip vortex of a full-scale MBB Bo 105 Helicopter is investigated experimentally under simulated hover flight conditions in ground effect by means of stereoscopic Particle Image Velocimetry. Based on the three-component velocity field of azimuthal vortex ages of y=1°, 3°, 5°, 10°, 20° and 30° vortex core radii, peak velocities, and vorticities are quantified and compared to model-scale experimental results available in literature and Vatistas’ low-order model for concentrated vortices. The vortex velocity profiles are found to be in satisfactory agreement with the model whereas the experimentally limited spatial resolution of the velocity fields results in a slight overestimation of the core radii and an underestimation of peak velocities as compared to model-scale investigations. Finally, an attempt has been made to cross-validate full-scale blade tip vortex parameters derived from Background Oriented Schlieren measurements using natural formation backgrounds.

Document Type:Conference or Workshop Item (Speech)
Title:A Full-Scale Particle Image Velocimetry Investigation of “Young” Rotor Blade Tip Vortices
AuthorsInstitution or Email of Authors
Kindler, Koljakolja.kindler@dlr.de
Mulleners, Karenmulleners@tfd.uni-hannover.de
Richard, HuguesDLR
Raffel, Markusmarkus.raffel@dlr.de
Keywords:blade tip vortex, full-scale PIV
Event Title:AHS 65th Annual Forum
Event Location:Grapevine, Texas
Event Type:international Conference
Event Dates:2009-05-27 - 2009-05-29
Organizer:AHS International
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: Karen Mulleners
Deposited On:26 Nov 2009 15:15
Last Modified:08 May 2014 23:17

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