ECN test farm measurements for validation of wake models
conference paper
Measurement results are presented from the EWTW test farm of ECN consisting of five 2.5 MW turbines in a row and a meteorological measurement mast of 108 m height. The data cover a period of about 2 years and are gathered for the validation of models for wake simulation and farm design. The results presented in this paper comprise: - farm performance for wind directions at small angles with the row, - performance of the individual turbines in the row up to quadruple wake conditions, - performance of a turbine in single wake conditions at regular and double rotor distance (3.8D and 7.6D), - turbulence intensities and turbulence ratios in single wakes at 2.5D and 3.5D distance behind the rotor. The results show that with wind directions at angles of about 25?? with the farm orientation the leeward turbines produce more power than the 1st turbine and that the difference increases downwind up to 14%. Striking and unexpected results are similar maximum performance deficits in single wakes at 3.8D and 7.6D and very low turbulence intensities and a
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TNO Identifier
821456
Publisher
ECN
Source title
European Wind Energy Conference 2007, Milan, Italy, 7-10 mei 2007.
Collation
12 p.
Place of publication
Petten
Pages
12 p.
Files