Mats Sandberg
University of Gävle, Gävle, Sweden
Hans Wigö
University of Gävle, Gävle, Sweden
Leif Clæsson
University of Gävle, Gävle, Sweden
Mathias Cehlin
University of Gävle, Gävle, Sweden
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http://dx.doi.org/10.3384/ecp110574090Published in: World Renewable Energy Congress - Sweden; 8-13 May; 2011; Linköping; Sweden
Linköping Electronic Conference Proceedings 57:6, p. 4090-4097
Published: 2011-11-03
ISBN: 978-91-7393-070-3
ISSN: 1650-3686 (print), 1650-3740 (online)
The energy captured by wind farms is reduced if there is an interaction between the individual turbines. In the paper a novel method for studying the interaction between wind turbines is presented. It is based on recording the static pressure on ground in a wind tunnel provided with wind turbine models.
The assumption is that the pressure distribution at ground reflects the pressure distribution at hub height. The pressure distribution at hub height is a result of the flow in the vicinity of the turbine.
The pressure at ground is recorded with a pressure plate provided with 400 pressure taps. The wind turbine model is a porous disk giving a non rotating wake.
At first the pressure response to one wind turbine is recorded. This is the reference case giving the characteristics of a non disturbed wind turbine. Its region of influence can therefore be determined. This provides important information on how to avoid any interaction between turbines. A nearby turbine should not be placed within the region of influence. In the paper we show how the pressure response varies with different distances between two turbines. The agreement between the static pressure on ground and at hub height has been tested by recording the static pressure at hub height with a small Prandtl tube.
Wind farms; Wind tunnel; Pressure distribution on ground; Pressure distribution at hub height; Region of influence
