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Energies 2017, 10(8), 1140;

Windbreak Effects Within Infinite Wind Farms

Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL 61801, USA
Department of Civil and Environmental Engineering, University of Illinois, Urbana, IL 61801, USA
Department of Aerospace Engineering, University of Illinois, Urbana, IL 61801, USA
Author to whom correspondence should be addressed.
Received: 9 May 2017 / Revised: 14 July 2017 / Accepted: 27 July 2017 / Published: 3 August 2017
(This article belongs to the Collection Wind Turbines)
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Building upon a recent study that showed windbreaks to be effective in increasing the power output of a wind turbine, the potential of windbreaks in a large wind farm is explored using simplified formulations. A top-down boundary layer approach is combined with methods of estimating both the roughness effects of windbreaks and the induced inviscid speed-up for nearby turbines to investigate power production impact for several layouts of infinite wind farms. Results suggest that the negative impact of windbreak wakes for an infinite wind farm will outweigh the local inviscid speed-up for realistic inter-turbine spacings, with the break-even point expected at a spacing of ∼25 rotor diameters. However, the possibility that windbreaks may be applicable in finite and other wind farm configurations remains open. Inspection of the windbreak porosity reveals an impact on the magnitude of power perturbation, but not whether the change is positive or negative. Predictions from the boundary-layer approach are validated with power measurements from large-eddy simulations. View Full-Text
Keywords: wind energy; windbreak; atmospheric boundary layer wind energy; windbreak; atmospheric boundary layer

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Tobin, N.; Chamorro, L.P. Windbreak Effects Within Infinite Wind Farms. Energies 2017, 10, 1140.

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