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Horizontal axis wind turbine tip and root vortex measurements

Sherry, Michael and Sheridan, John and Lo Jacono, David Horizontal axis wind turbine tip and root vortex measurements. (2010) In: 15th International Symposium on Applications of Laser Techniques to Fluid Mechanics, 5-8 July 2010, Lisboa, Portugal . (Unpublished)

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Abstract

The vortical wake of the Tjaereborg wind turbine has been investigated experimentally in a water channel. Both the upwind and downwind configurations were tested. The hydrogen bubble and particle streak techniques were used to visualize the flow prior to obtaining quantitative data using planar particle image velocimetry. Parameters that describe the helical vortex wake, such as the helix pitch, vortex core radius, vortex circulation and vortex meander, were determined for three tip speed ratios, λ=4,7,10. Particular attention was given to the characteristics of the root vortex, which have not previously been measured experimentally. A key finding of the investigation was the rapid diffusion of the coherent root vortex due to the small radius of curvature of the root vortex filament, interaction with the tower section, when in the upwind configuration, and its location near the nacelle boundary layer. The root vortex signal extends further into the wake in the downwind turbine configuration, as there is no tower-vortex interaction, prior to its being diffused in the strong strain field immediately downstream of the nacelle. A coherent tip vortex signal is present over the entire measurement area x/R<2, however the root vortex signal subsides much closer to the rotor plane. The study is part of a more extensive study of the vortex interactions within the wake. The mechanisms affecting wake stability are also briefly commented on.

Item Type:Conference or Workshop Item (Paper)
Additional Information:A Special Issue of Experiments in Fluids will be published by Springer Verlag with papers selected from the last Symposium edition in about one year later (see http://ltces.dem.ist.utl.pt/lxlaser/). In the meantime, the original PDF of the article can be found at the International Symposia on Applications of Laser Techniques to Fluid Mechanics website: http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2010/programme.asp
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Monash University (AUSTRALIA)
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Deposited By: Catherine THURIOT

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