期刊
Energies
卷 8, 期 10, 页码 11955-11972出版社
MDPI AG
DOI: 10.3390/en81011955
关键词
tip vortices; turbulent wake; wind energy; wind turbine; winglet
资金
- National Science Foundation [DGE-1144245]
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign
Wind tunnel experiments were performed to investigate the effects of downstream-facing winglets on the wake dynamics, power and thrust of a model wind turbine. Two similar turbines with and without winglets were operated under the same conditions. Results show an increase in the power and thrust coefficients of 8.2% and 15.0% for the wingletted case. A simple theoretical treatment of a two-turbine system suggests a possible positive tradeoff between increasing power and thrust coefficients at a wind farm scale. The higher thrust coefficient created a region of enhanced mean shear and turbulence in the outer portion of the wake. The winglets did not significantly change the tip-vortex strength, but higher levels of turbulence in the far wake decreased the tip-vortex strength. Because of the increased mean shear in the wingletted turbine's wake, the Reynolds stresses were higher, potentially leading to a higher energy flux downstream.
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