A field study of the wake behind a 2 MW wind turbine
作者： U. Högström , D.N. Asimakopoulos , H. Kambezidis , C.G. Helmis , A. Smedman
DOI: 10.1016/0004-6981(88)90020-0
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摘要: Abstract The wake behind the 2 MW wind turbine situated on flat country at Nasudden, Sweden has been mapped in a field experiment where several measuring techniques were employed. A high resolution sodar appeared to be very powerful tool which enabled detailed studies of both mean and turbulence profiles carried out. Measurements with this system made three antennae different modes operation distances range D –3.6 from ( being rotor diameter, 75 m). Additional data obtained instruments levels 145 m tower, 3 downwind, during conditions blowing towards tower. Finally good quality centre line velocity deficit longitudinal intensity Tala kites up 10.5 . measurements show agreement thrust coefficient derived characteristics. was found vary distance as x −1.1 , general tunnel simulations, but constant proportionality about 40% lower than those simulations. Detailed structure have obtained. For downwind few diameters, vertical profile is resemble corresponding laboratory, two sharp peaks radius centre. level an average factor higher Turbulence spectra measured tower mounted significantly increased fluctuation for frequencies above 0.004 Hz decreased energy frequencies.
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