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Energies 2019, 12(2), 227; https://doi.org/10.3390/en12020227

Effect of Rotor Thrust on the Average Tower Drag of Downwind Turbines

1
Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan
2
Interdisciplinary Graduate School of Engineering and Science, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan
*
Author to whom correspondence should be addressed.
Received: 28 November 2018 / Revised: 8 January 2019 / Accepted: 8 January 2019 / Published: 12 January 2019
(This article belongs to the Special Issue Fluid Flow and Heat Transfer)
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Abstract

A new analysis method to calculate the rotor-induced average tower drag of downwind turbines in the blade element momentum (BEM) method was developed in this study. The method involves two parts: calculation of the wind speed distribution using computational fluid dynamics, with the rotor modeled as a uniform loaded actuator disc, and calculation of the tower drag via the strip theory. The latter calculation considers two parameters, that is, the decrease in wind speed and the pressure gradient caused by the rotor thrust. The present method was validated by a wind tunnel test. Unlike the former BEM, which assumes the tower drag to be constant, the results obtained by the proposed method demonstrate much better agreement with the results of the wind tunnel test, with an accuracy of 30%. View Full-Text
Keywords: wind turbine; downwind; tower shadow; load; tower; BEM; actuator disc wind turbine; downwind; tower shadow; load; tower; BEM; actuator disc
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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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Yoshida, S.; Fujii, K.; Hamasaki, M.; Takada, A. Effect of Rotor Thrust on the Average Tower Drag of Downwind Turbines. Energies 2019, 12, 227.

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