Effects of Turbulence Intensities on Wake Models of Horizontal Wind Turbines

Abstract

Abstract In this paper, wind tunnel tests of a scaled wind turbine have been performed to investigate the effects of turbulent intensity of oncoming flow on turbine wake field. The scaled turbine model was carefully designed to satisfy the similarity conditions. The wind velocities and turbulent intensities were measured using hotwire anemometer in order to compare with existing wake model. It was found from the tests that the existing wake models well fit with test results at turbulent flow rather than at uniform flow. Finally modified wake model has been proposed based on the measured data. Keywords :wind turbine,wake model, turbulence intensity, wind tunnel test † Corresponding author: Tel: +82-63-270-2289; E-mail: sdkwon@chonbuk.ac.krReceived July 11 2014; Revised July 21 2014Accepted July 23 2014Ⓒ2014 by Computational Structural Engineering Institute of KoreaThis is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License(http://creativecommons. org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.Fig. 1 Wake effect in Horns Rev. wind farm(owned by Vattenfall. Phothographer Christian Steiness)