Seeking relevant criteria for testing the quality of turbulence models, the scale of turbulence and the gust factor have been estimated from data and compared with predictions from first-order models of these two quantities. It is found that the mean of the measured length scales is approximately 10% smaller than the IEC model for wind turbine hub height levels. The mean is only marginally dependent on trends in time series. It is also found that the coefficient of variation of the measured length scales is about 50%. and preaveraging of wind speed data are relevant for megawatt-size wind turbines when seeking wind characteristics that correspond to one blade and the entire rotor, respectively. For heights exceeding , the gust factor increases with wind speed. For heights larger than , present assumptions on the value of the gust factor are significantly conservative, both for and preaverages. The usually applied value of should probably be reduced.
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e-mail: hans.e.joergensen@risoe.dk
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August 2008
Research Papers
Relevant Criteria for Testing the Quality of Models for Turbulent Wind Speed Fluctuations
Hans E. Jørgensen,
e-mail: hans.e.joergensen@risoe.dk
Hans E. Jørgensen
Risø National Laboratory
, Frederksborgvej 399, Roskilde 4000, Denmark
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John Dalsgaard Sørensen
e-mail: jds@civil.aau.dk
John Dalsgaard Sørensen
Aalborg University
, Fredrik Bajers Vej 5, P.O.Box 159, DK-9100 Aalborg, Denmark
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Hans E. Jørgensen
Risø National Laboratory
, Frederksborgvej 399, Roskilde 4000, Denmarke-mail: hans.e.joergensen@risoe.dk
John Dalsgaard Sørensen
Aalborg University
, Fredrik Bajers Vej 5, P.O.Box 159, DK-9100 Aalborg, Denmarke-mail: jds@civil.aau.dk
J. Sol. Energy Eng. Aug 2008, 130(3): 031016 (7 pages)
Published Online: July 16, 2008
Article history
Received:
May 24, 2007
Revised:
September 3, 2007
Published:
July 16, 2008
Citation
Frandsen, S., Jørgensen, H. E., and Sørensen, J. D. (July 16, 2008). "Relevant Criteria for Testing the Quality of Models for Turbulent Wind Speed Fluctuations." ASME. J. Sol. Energy Eng. August 2008; 130(3): 031016. https://doi.org/10.1115/1.2931511
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