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Energies 2015, 8(10), 11955-11972; doi:10.3390/en81011955

An Experimental Study on the Effects ofWinglets on the Wake and Performance of a ModelWind Turbine

1
Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL 61801, USA
2
Department of Civil and Environmental Engineering, University of Illinois, Urbana, IL 61801, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Frede Blaabjerg
Received: 25 August 2015 / Revised: 25 September 2015 / Accepted: 3 October 2015 / Published: 21 October 2015
(This article belongs to the Special Issue Wind Turbine 2015)
View Full-Text   |   Download PDF [2852 KB, uploaded 21 October 2015]   |  

Abstract

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. View Full-Text
Keywords: tip vortices; turbulent wake; wind energy; wind turbine; winglet tip vortices; turbulent wake; wind energy; wind turbine; winglet
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Tobin, N.; Hamed, A.M.; Chamorro, L.P. An Experimental Study on the Effects ofWinglets on the Wake and Performance of a ModelWind Turbine. Energies 2015, 8, 11955-11972.

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