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Dynamic stall development

Mulleners, Karen and Raffel, Markus (2013) Dynamic stall development. Experiments in Fluids, 54 (2), pp. 1469-1477. Springer. DOI: 10.1007/s00348-013-1469-7 ISSN 0723-4864

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Official URL: http://link.springer.com/journal/348/54/2/page/1

Abstract

Dynamic stall on an oscillating airfoil was investigated by a combination of surface pressure measurements and time-resolved particle image velocimetry. Following up on previous work on the onset of dynamic stall (Mulleners and Raffel in Exp Fluids 52(3):779-793, 2012), we combined time-resolved imaging with an extensive coherent structure analysis to study various aspects of stall development. The formation of the primary dynamic stall vortex was identified as the growth of a recirculation region and the ensuing instability of the associated shear layer. The stall development can be subdivided into two stages of primary and secondary instability with the latter being the effective vortex formation stage. The characteristic time scales associated with the primary instability stage revealed an overall decrease in dynamic stall delay with increasing effective unsteadiness of the pitching airfoil. The vortex formation stage was found to be largely unaffected by variations of the airfoil’s dynamics.

Item URL in elib:https://elib.dlr.de/81302/
Document Type:Article
Additional Information:Published online: 08. Feb. 2013, Online ISSN:1432-1114, Article: 1469
Title:Dynamic stall development
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Mulleners, KarenLeibniz Universität HannoverUNSPECIFIED
Raffel, Markusmarkus.raffel (at) dlr.dehttps://orcid.org/0000-0002-3340-9115
Date:2013
Journal or Publication Title:Experiments in Fluids
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:54
DOI :10.1007/s00348-013-1469-7
Page Range:pp. 1469-1477
Publisher:Springer
ISSN:0723-4864
Status:Published
Keywords:dynamic stall, Particle Image Velocimetry (PIV), vortex formation, coherent structure analysis, time-resolved particle image velocimetry
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 Innovative Rotorcraft (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Helicopter, GO
Deposited By: Winkels, Elisabeth
Deposited On:15 Apr 2013 12:43
Last Modified:06 Sep 2019 15:25

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