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Energies 2018, 11(8), 2035; https://doi.org/10.3390/en11082035

Experimental Investigation of Flow-Induced Motion and Energy Conversion of a T-Section Prism

State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, No. 92, Wei Jin Road, Nan Kai District, Tianjin 300072, China
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Received: 25 June 2018 / Revised: 28 July 2018 / Accepted: 2 August 2018 / Published: 6 August 2018
(This article belongs to the Special Issue Fluid Flow and Heat Transfer)
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Abstract

Flow-induced motion (FIM) performs well in energy conversion but has been barely investigated, particularly for prisms with sharp sections. Previous studies have proven that T-section prisms that undergo galloping branches with high amplitude are beneficial to energy conversions. The FIM experimental setup designed by Tianjin University (TJU) was improved to conduct a series of FIM responses and energy conversion tests on a T-section prism. Experimental results are presented and discussed, to reveal the complete FIM responses and power generation characteristics of the T-section prism under different load resistances and section aspect ratios. The main findings are summarized as follows. (1) Hard galloping (HG), soft galloping (SG), and critical galloping (CG) can be observed by varying load resistances. When the load resistances are low, HG occurs; otherwise, SG occurs. (2) In the galloping branch, the highest amplitude and the most stable oscillation cause high-quality electrical energy production by the generator. Therefore, the galloping branch is the best branch for harvesting energy. (3) In the galloping branch, as the load resistances decrease, the active power continually increases until the prism is suppressed from galloping to a vortex-induced vibration (VIV) lower branch with a maximum active power Pharn of 21.23 W and a maximum ηout of 20.2%. (4) Different section aspect ratios (α) can significantly influence the FIM responses and energy conversions of the T-section prism. For small aspect ratios, galloping is hardly observed in the complete responses, but the power generation efficiency (ηout,0.8 = 27.44%) becomes larger in the galloping branch. View Full-Text
Keywords: flow-induced motion; sharp sections; T-section prism; load resistances; section aspect ratios; energy conversion flow-induced motion; sharp sections; T-section prism; load resistances; section aspect ratios; energy conversion
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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 (CC BY 4.0).
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Shao, N.; Lian, J.; Xu, G.; Liu, F.; Deng, H.; Ren, Q.; Yan, X. Experimental Investigation of Flow-Induced Motion and Energy Conversion of a T-Section Prism. Energies 2018, 11, 2035.

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