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Article

Wind Turbines with Truncated Blades May Be a Possibility for Dense Wind Farms

1
Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL 61801, USA
2
Department of Mechanical Engineering, The University of Texas at Dallas, Richardson, TX 75080, USA
3
Department of Aerospace Engineering, University of Illinois, Urbana, IL 61801, USA
4
Department of Civil and Environmental Engineering, University of Illinois, Urbana, IL 61801, USA
*
Author to whom correspondence should be addressed.
Energies 2020, 13(7), 1810; https://doi.org/10.3390/en13071810
Received: 17 March 2020 / Revised: 31 March 2020 / Accepted: 3 April 2020 / Published: 9 April 2020
(This article belongs to the Special Issue Fluid Mechanics and Turbulence in Wind Farms)
We experimentally explored the impact of a wind turbine with truncated blades on the power output and wake recovery, and its effects within 2 × 3 arrays of standard units. The blades of the truncated turbine covered a fraction of the outer region of the rotor span and replaced with a zero-lift structure around the hub, where aerodynamic torque is comparatively low. This way, the incoming flow around the hub may be used as a mixing enhancement mechanism and, consequently, to reduce the flow deficit in the wake. Particle image velocimetry was used to characterize the incoming flow and wake of various truncated turbines with a variety of blade length ratios L / R = 0.6 , 0.7, and 1, where L is the length of the working section of the blade of radius R. Power output was obtained at high frequency in each of the truncated turbines, and also at downwind units within 2 × 3 arrays with streamwise spacing of Δ x / d T = 4 , 5, and 6, with d T being the turbine diameter. Results show that the enhanced flow around the axis of the rotor induced large-scale instability and mixing that led to substantial power enhancement of wind turbines placed 4 d T downwind of the L / R = 0.6 truncated units; this additional power is still relevant at 6 d T . Overall, the competing factors defined by the expected power reduction of truncated turbines due to the decrease in the effective blade length, the need for reduced components of the truncated units, and enhanced power output of downwind standard turbines suggest a techno-economic optimization study for potential implementation. View Full-Text
Keywords: turbine blades; truncated rotors; wind turbines; wind farms turbine blades; truncated rotors; wind turbines; wind farms
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MDPI and ACS Style

Cheng, S.; Jin, Y.; Chamorro, L.P. Wind Turbines with Truncated Blades May Be a Possibility for Dense Wind Farms. Energies 2020, 13, 1810. https://doi.org/10.3390/en13071810

AMA Style

Cheng S, Jin Y, Chamorro LP. Wind Turbines with Truncated Blades May Be a Possibility for Dense Wind Farms. Energies. 2020; 13(7):1810. https://doi.org/10.3390/en13071810

Chicago/Turabian Style

Cheng, Shyuan; Jin, Yaqing; Chamorro, Leonardo P. 2020. "Wind Turbines with Truncated Blades May Be a Possibility for Dense Wind Farms" Energies 13, no. 7: 1810. https://doi.org/10.3390/en13071810

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