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A particle image velocimetry study of dual-rotor counter-rotating wind turbine near wake.

Hollands, E.O. and He, C. and Gan, L. (2020) 'A particle image velocimetry study of dual-rotor counter-rotating wind turbine near wake.', Journal of vizualisation., 23 (3). pp. 425-435.

Abstract

This experimental work studied the flow characteristics in the near wake region behind dual-rotor wind turbines using two-dimensional particle image velocimetry. Two auxiliary rotors of 50% and 80% scale of the main rotor were installed upwind and operated in counter-rotating condition, which are compared to the conventional single rotor turbine. In all the three configurations, a constant Reynolds number 9.5×104 was applied and all the rotors operated at a fixed tip speed ratio of 3.46. The mean and phase averaged velocity fields were investigated together with the turbulence kinetic energy. It was found that the two auxiliary rotors do not result in a significantly different wake flow property. The configuration implementing the 50% auxiliary rotor sees a slightly better wake characteristics, in terms of weaker main rotor tip vortices and a counter-rotating swirling shear region at the mid-span behind the main rotor. The decay rates of the peak vorticity of the main rotor tip vortices and their circulation are found to follow an exponential manner.

Item Type:Article
Full text:Publisher-imposed embargo
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Full text:(VoR) Version of Record
Available under License - Creative Commons Attribution.
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1007/s12650-020-00643-0
Publisher statement:This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Date accepted:03 October 2019
Date deposited:28 October 2019
Date of first online publication:31 March 2020
Date first made open access:23 April 2020

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