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Modelling and Simulation in Engineering
Volume 2011, Article ID 749421, 7 pages
http://dx.doi.org/10.1155/2011/749421
Research Article

Comparisons between the Wake of a Wind Turbine Generator Operated at Optimal Tip Speed Ratio and the Wake of a Stationary Disk

Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan

Received 11 November 2010; Accepted 22 February 2011

Academic Editor: Guan Yeoh

Copyright © 2011 Takanori Uchida et al. 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.

Abstract

The wake of a wind turbine generator (WTG) operated at the optimal tip speed ratio is compared to the wake of a WTG with its rotor replaced by a stationary disk. Numerical simulations are conducted with a large eddy simulation (LES) model using a nonuniform staggered Cartesian grid. The results from the numerical simulations are compared to those from wind-tunnel experiments. The characteristics of the wake of the stationary disk are significantly different from those of the WTG. The velocity deficit at a downstream distance of 1 0 𝐷 ( 𝐷 : rotor diameter) behind the WTG is approximately 30 to 40% of the inflow velocity. In contrast, flow separation is observed immediately behind the stationary disk ( 2 𝐷 ), and the velocity deficit in the far wake ( 1 0 𝐷 ) of the stationary disk is smaller than that of the WTG.