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Mutual inductance of two helical vortices

Nemes, Andras and Lo Jacono, David and Blackburn, Hugh M. and Sheridan, John Mutual inductance of two helical vortices. (2015) Journal of Fluid Mechanics, 774. 298-310. ISSN 0022-1120

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Official URL: http://dx.doi.org/10.1017/jfm.2015.288

Abstract

The pairing of helical tip vortices in the wake of a two-bladed rotor is investigated experimentally. Time-resolved particle image velocimetry measurements provide a clear temporal and spatial evolution of the vortical structures, highlighting the transition to instability and the effect of tip speed ratio and helical spacing. The temporal growth rate of the vortex system instabilities were measured and are shown to be dependent on helical spacing. The evolution of filaments and their growth rates support the argument that the mutual inductance mode is the driving mechanism behind the transition to an unstable wake. The measurements are in agreement with maximum growth rates predicted by linear stability analyses of single- and double-helix arrangements. In addition, the wake topology due to varying rotor load through tip speed ratio variation is shown to play an important role in the initial symmetry breaking that drives the wake transition.

Item Type:Article
Additional Information:Thanks to Cambridge University Press editor. The definitive version is available at http://journals.cambridge.org/ The original PDF of the article can be found at Cambridge University Press website : http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=9760654&fileId=S0022112015002888
HAL Id:hal-01167069
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:
Australian Research Council (ARC) - Centre National de la Recherche Scientifique (CNRS)
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Deposited On:23 Jun 2015 15:14

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