Numerical Investigation on a Diffuser-Augmented Horizontal Axis Tidal Stream Turbine with the Entropy Production Theory

Wei Zang, Yuan Zheng, Yuquan Zhang (), Xiangfeng Lin, Yanwei Li and Emmanuel Fernandez-Rodriguez
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Wei Zang: College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
Yuan Zheng: College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
Yuquan Zhang: College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
Xiangfeng Lin: College of Harbor Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China
Yanwei Li: College of Energy and Electrical Engineering, Hohai University, Nanjing 210098, China
Emmanuel Fernandez-Rodriguez: Technological Institute of Merida, Technological Avenue, Merida 97118, Mexico

Mathematics, 2022, vol. 11, issue 1, 1-18

Abstract: An implication of a turbine current is the development of a wake, a reduced speed flow, thus affecting the performance of an adjoined turbine. The aim of this study is to examine the turbine wake properties to offer a basic framework for the exploration of efficient turbine arrangements through the OpenFOAM source package and the entropy production theory. The results indicate that the diffuser inlet produces the largest entropy rate; however, this dissipates quickly after the rotor plane. In terms of vorticity, the Q and λ 2 -criterion results are sensitive to the isosurface thresholds. In general, the Ω-Rortex method proves a convenient and accurate solution for vortex visualization and identification. For the overall mean wake structure, the velocity profile follows a tadpole-shape, whilst the velocity deficits above 100% are observed around the nacelle and throat (diffuser) and behind the tower. The concentration of maximum turbulent intensities appears behind the throat of the diffuser and at the top and bottom of the tower. Owing to the swirling effect after rotor, we proposed recommended values of b 0 = 10 −5 for the hydrodynamic investigation of tidal stream turbines. The present findings extend our knowledge on the flow disruption due to shrouded turbines and are particularly relevant for farm project advisors.

Keywords: diffuser-augmented tidal stream turbine; near wake structure; turbulent intensity; entropy production theory; Rortex criterion (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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