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Energies 2016, 9(10), 830; doi:10.3390/en9100830

Effects of Freestream Turbulence in a Model Wind Turbine Wake

1
Mechanical Science and Engineering, University of Illinois, Urbana, IL 61801, USA
2
College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210024, China
3
Civil, Environmental, and Construction Engineering, University of Central Florida, Orlando, FL 32816, USA
4
Aerospace Engineering, University of Illinois, Urbana, IL 61801, USA
5
Civil and Environmental Engineering, University of Illinois, Urbana, IL 61801, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Frede Blaabjerg
Received: 29 August 2016 / Revised: 4 October 2016 / Accepted: 9 October 2016 / Published: 15 October 2016
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Abstract

The flow structure in the wake of a model wind turbine is explored under negligible and high turbulence in the freestream region of a wind tunnel at R e 7 × 10 4 . Attention is placed on the evolution of the integral scale and the contribution of the large-scale motions from the background flow. Hotwire anemometry was used to obtain the streamwise velocity at various streamwise and spanwise locations. The pre-multiplied spectral difference of the velocity fluctuations between the two cases shows a significant energy contribution from the background turbulence on scales larger than the rotor diameter. The integral scale along the rotor axis is found to grow linearly with distance, independent of the incoming turbulence levels. This scale appears to reach that of the incoming flow in the high turbulence case at x / d 35–40. The energy contribution from the turbine to the large-scale flow structures in the low turbulence case increases monotonically with distance. Its growth rate is reduced past x / d 6–7. There, motions larger than the rotor contribute ∼ 50 % of the total energy, suggesting that the population of large-scale motions is more intense in the intermediate field. In contrast, the wake in the high incoming turbulence is quickly populated with large-scale motions and plateau at x / d 3 . View Full-Text
Keywords: integral length scale; wake; wind turbine; large-scale motions integral length scale; wake; wind turbine; large-scale motions
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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

Jin, Y.; Liu, H.; Aggarwal, R.; Singh, A.; Chamorro, L.P. Effects of Freestream Turbulence in a Model Wind Turbine Wake. Energies 2016, 9, 830.

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