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http://hdl.handle.net/10397/90925
Title: | Numerical study of ducted turbines in bi-directional tidal flows | Authors: | Maduka, M Li, CW |
Issue Date: | 2021 | Source: | Engineering applications of computational fluid mechanics, 2021, v. 15, no. 1, p. 194-209 | Abstract: | Installing a turbine in a duct generally increases the flow through the rotor. If there is flow confinement due to limited water depth, the presence of lateral boundaries, or the presence of adjacent turbines, a further flow enhancement through the rotor will be achieved. Extensive studies of ducted turbines in uni-directional flow have shown that rotor-based power coefficient (Formula presented.) can exceed the Betz-Joukowsky limit (BJL) for bare turbine, whereas the exceedance of the BJL is rarely reported for duct-area-based power coefficient (Formula presented.). In this work, CFD studies have been carried out for several flanged duct turbines with different duct geometries under bi-directional flow conditions. The actuator disc approach is used to simulate the rotor. The results show that a flanged duct turbine with an inlet-arc flap and a curved brim can achieve a maximum value of (Formula presented.) close to the BJL for flow from either direction while a symmetric duct turbine- gives maximum (Formula presented.) of about 60% of the BJL. The effect of the flow confinement on (Formula presented.) shows (Formula presented.) increases with blockage ratio (Formula presented.) and a little variation in the relative performance of ducted and bare turbines. (Formula presented.). The findings pave the way for the realization of turbines with a flanged duct. | Keywords: | Computational fluid dynamics Ducted turbine Flanged duct Tidal energy |
Publisher: | Hong Kong Polytechnic University, Department of Civil and Structural Engineering | Journal: | Engineering applications of computational fluid mechanics | ISSN: | 1994-2060 | EISSN: | 1997-003X | DOI: | 10.1080/19942060.2021.1872706 | Rights: | © 2021 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The following publication M. Maduka & C.W. Li (2021) Numerical study of ducted turbines in bidirectional tidal flows, Engineering Applications of Computational Fluid Mechanics, 15:1, 194-209 is available at https://doi.org/10.1080/19942060.2021.1872706 |
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