Journal
WIND ENERGY
Volume 15, Issue 5, Pages 743-756Publisher
WILEY-BLACKWELL
DOI: 10.1002/we.502
Keywords
wind turbine; near wake; yaw angle; tip speed ratio; experiment
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Funding
- project KMB 'Deep sea offshore wind technology'
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The performance characteristics and the near wake of a model wind turbine were investigated experimentally. The model tested is a three-bladed horizontal axis type wind turbine with an upstream rotor of 0.90?m diameter. The performance measurements were conducted at various yaw angles, a freestream speed of about 10?m?s -1, and the tip speed ratio was varied from 0.5 to 12. The time-averaged streamwise velocity field in the near wake of the turbine was measured at different tip speed ratios and downstream locations. As expected, it was found that power and thrust coefficients decrease with increasing yaw angle. The power loss is about 3% when the yaw angle is less than 10 degrees and increases to more than 30% when the yaw angle is greater than 30 degrees. The velocity distribution in the near wake was found to be strongly influenced by the tip speed ratio and the yaw angle. At the optimum tip speed ratio, the axial velocity was almost uniform within the midsection of the rotor wake, whereas two strong peaks are observed for high tip speed ratios when the yaw angle is 0 degrees. As the yaw angle increases, the wake width was found to be reduced and skewed towards the yawed direction. With increasing downstream distance, the wake velocity field was observed to depend on the tip speed ratio and more pronounced at high tip speed ratio. Copyright (c) 2011 John Wiley & Sons, Ltd.
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