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The interaction of helical tip and root vortices in a wind turbine wake

Sherry, Michael and Nemes, Andras and Lo Jacono, David and Blackburn, Hugh M. and Sheridan, John The interaction of helical tip and root vortices in a wind turbine wake. (2013) Physics of Fluids, 25. 1-16. ISSN 1070-6631

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Official URL: http://dx.doi.org/10.1063/1.4824734

Abstract

Analysis of the helical vortices measured behind a model wind turbine in a water channel are reported. Phase-locked measurements using planar particle image ve- locimetry are taken behind a Glauert rotor to investigate the evolution and breakdown of the helical vortex structures. Existing linear stability theory predicts helical vortex filaments to be susceptible to three unstable modes. The current work presents tip and root vortex evolution in the wake for varying tip speed ratio and shows a breaking of the helical symmetry and merging of the vortices due to mutual inductance between the vortical filaments. The merging of the vortices is shown to be steady with rotor phase, however, small-scale non-periodic meander of the vortex positions is also ob- served. The generation of the helical wake is demonstrated to be closely coupled with the blade aerodynamics, strongly influencing the vortex properties which are shown to agree with theoretical predictions of the circulation shed into the wake by the blades. The mutual inductance of the helices is shown to occur at the same non-dimensional wake distance.

Item Type:Article
Additional Information:Thanks to AIP editor. The original publication is available at http://scitation.aip.org
HAL Id:hal-00913622
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Monash University (AUSTRALIA)
Laboratory name:
Funders:
ARC Discovery Project DP1096444
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Deposited On:04 Dec 2013 09:25

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