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Energies 2017, 10(1), 121; doi:10.3390/en10010121

Numerical Analysis of the Effects of Rotating Wind Turbine Blades on the Aerodynamic Forces Acting on Tower

1
Institute of Science and Engineering, Kanazawa University, Kanazawa 920-1192, Japan
2
National Instiute of Advanced Industrial Science and Technology, Koriyama 963-0298, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Lance Manuel
Received: 21 August 2016 / Revised: 9 January 2017 / Accepted: 13 January 2017 / Published: 19 January 2017
(This article belongs to the Special Issue Modeling and Simulation for Wind Turbine Loads Analysis)
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Abstract

We have investigated the effects of the rotating blades of an upwind-type three-blade horizontal-axis wind turbine (HAWT) on the basic characteristics of aerodynamic forces acting on its tower by conducting improved delayed detached-eddy simulations (DESs). Three tip-speed ratios were considered for the operating conditions of the HAWT: λ = 3 (low), λ = 6 (optimum), and λ = 10 (high). The diversion of the flow approaching the tower by the rotating blades and the low-pressure region that formed downwind of the blades significantly affected the aerodynamic forces acting on the tower. For example, the azimuth angle around the tower at which the pressure reached a maximum at each height shifted significantly in the direction of the movement of the blade passing the tower because of the diversion of the flow by the blades. Fluctuations in the lift force of the tower were significantly larger than those in its drag force because of the low-pressure region downwind of the blades. View Full-Text
Keywords: horizontal-axis wind turbine (HAWT); computational fluid dynamics (CFD); detached-eddy simulation (DES); tower; aerodynamic force; blade-tower interaction (BTI) horizontal-axis wind turbine (HAWT); computational fluid dynamics (CFD); detached-eddy simulation (DES); tower; aerodynamic force; blade-tower interaction (BTI)
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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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Kono, T.; Nebucho, S.; Kogaki, T.; Kiwata, T.; Kimura, S.; Komatsu, N. Numerical Analysis of the Effects of Rotating Wind Turbine Blades on the Aerodynamic Forces Acting on Tower. Energies 2017, 10, 121.

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