Abstract
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 approx. 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%. 3sec and 10sec pre-averaging of wind speed data are relevant for MW-size wind turbines when seeking wind characteristics that correspond to one blade and the entire rotor, respectively. For heights exceeding 50-60m the gust factor increases with wind speed. For heights larger the 60-80m, present assumptions on the value of the gust factor are significantly conservative, both for 3sec and 10sec pre-averages. The usually applied value of kp ≈ 3 should probably be reduced.
Original language | English |
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Title of host publication | Proceedings of The European Wind Energy Conference and Exhibition, EWEC 2007 |
Number of pages | 5 |
Publisher | The European Wind Energy Association |
Publication date | 2007 |
Pages | 128-132 |
Publication status | Published - 2007 |
Event | European Wind Energy Conference & Exhibition, EWEC 2007 - Milan, Italy Duration: 7 May 2007 → 10 May 2007 |
Conference
Conference | European Wind Energy Conference & Exhibition, EWEC 2007 |
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Country/Territory | Italy |
City | Milan |
Period | 07/05/2007 → 10/05/2007 |
Bibliographical note
Invited paper and presentationPDF for print: 7 pp.
Keywords
- Turbulence Models
- Gust Factors
- Eddies
- Large-Eddy Simulations