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Energies 2017, 10(1), 79; doi:10.3390/en10010079

Effect on Torque and Thrust of the Pointed Tip Shape of a Wind Turbine Blade

1
Center for Energy and Environmental Sustainability, Incohen Co., Seoul 05510, Korea
2
Center for Energy and Environmental Sustainability (CEES), Department of Mechanical Engineering, Prairie View A&M University (PVAMU), Prairie View, TX 77446, USA
3
Center for Energy and Environmental Sustainability, Department of Civil & Environmental Engineering, Prairie View A&M University (PVAMU), Prairie View, TX 77446, USA
4
School of Architecture, Department of Architectural Engineering, Inha University, Inchoen 402-751, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Frede Blaabjerg
Received: 11 November 2016 / Revised: 2 January 2017 / Accepted: 2 January 2017 / Published: 11 January 2017
(This article belongs to the Special Issue Wind Turbine 2017)
View Full-Text   |   Download PDF [11428 KB, uploaded 11 January 2017]   |  

Abstract

This paper presents the effect of the tip shape of a wind turbine blade on aerodynamic forces, including the effects of separation, transition and stall. A National Renewable Energy Laboratory (NREL) Phase-VI wind turbine blade was used, in which the shape of the tip was modified to a pointed tip. Computational fluid dynamics (CFD) simulations were employed for the analysis and the results were compared with the original NREL blade CFD and experimental data using ANSYS CFX (Ansys Inc., Delaware, PA, USA). To predict the separation and separation-induced transition on both near wall and far away, the shear-stress-transport (SST) Gamma-Theta turbulent model was used. The stall onset of a 20° angle of attack and its effects were also analyzed and presented. The value of torque with the pointed tip blade was found to be 3%–8% higher than the original NREL blade showing the benefit of the pointed tip. Normal force coefficient is lower at the tip for the pointed tip blade, which results in lower deformation of the blade. It was found that the pointed-tip blade is more efficient in terms of generating torque than the original NREL Phase-VI blade in the dynamic stall region of 10–15 m/s wind speeds. View Full-Text
Keywords: wind energy; wind turbine blade; pointed tip blade; National Renewable Energy Laboratory (NREL) Phase VI; shear-stress-transport (SST) Gamma-Theta turbulent model; separation and transition wind energy; wind turbine blade; pointed tip blade; National Renewable Energy Laboratory (NREL) Phase VI; shear-stress-transport (SST) Gamma-Theta turbulent model; separation and transition
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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

Lee, K.; Roy, S.; Huque, Z.; Kommalapati, R.; Han, S. Effect on Torque and Thrust of the Pointed Tip Shape of a Wind Turbine Blade. Energies 2017, 10, 79.

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