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A regular Strouhal number for large-scale instability in the far wake of a rotor

Published online by Cambridge University Press:  17 April 2014

Valery L. Okulov ,
Igor V. Naumov ,
Robert F. Mikkelsen ,
Ivan K. Kabardin  and
Jens N. Sørensen
Valery L. Okulov*
Affiliation:
Technical University of Denmark, Nils Koppels All’e B403, 2800 Kgs Lyngby, Denmark
Igor V. Naumov
Affiliation:
Institute of Thermophysics, SB RAS, Lavrentyev Ave. 1, 630090 Novosibirsk, Russia
Robert F. Mikkelsen
Affiliation:
Technical University of Denmark, Nils Koppels All’e B403, 2800 Kgs Lyngby, Denmark
Ivan K. Kabardin
Affiliation:
Institute of Thermophysics, SB RAS, Lavrentyev Ave. 1, 630090 Novosibirsk, Russia
Jens N. Sørensen
Affiliation:
Technical University of Denmark, Nils Koppels All’e B403, 2800 Kgs Lyngby, Denmark
*
†Email address for correspondence: [email protected]
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Abstract

The flow behind a model of a wind turbine rotor is investigated experimentally in a water flume using particle image velocimetry (PIV) and laser Doppler anemometry (LDA). The study performed involves a three-bladed wind turbine rotor designed using the optimization technique of Glauert (Aerodynamic Theory, vol. IV, 1935, pp. 169–360). The wake properties are studied for different tip speed ratios and free stream speeds. The data for the various rotor regimes show the existence of a regular Strouhal number associated with the development of an instability in the far wake of the rotor. From visualizations and a reconstruction of the flow field using LDA and PIV measurements it is found that the wake dynamics is associated with a precession (rotation) of the helical vortex core.

JFM classification

Vortex Flows: Vortex instability Vortex Flows: Vortex shedding Wakes/Jets: Wakes/Jets
Type
Papers
Information
Journal of Fluid Mechanics , Volume 747 , 25 May 2014 , pp. 369 - 380
Copyright
© 2014 Cambridge University Press 

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