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J. Mar. Sci. Eng. 2016, 4(3), 59; doi:10.3390/jmse4030059

Dynamics of a Marine Turbine for Deep Ocean Currents

1
Institute of Applied Mechanics, National Taiwan University, Taipei 106, Taiwan
2
Energy Research Center, National Taiwan University, Taipei 106, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Dong-Sheng Jeng
Received: 11 July 2016 / Revised: 19 August 2016 / Accepted: 5 September 2016 / Published: 12 September 2016
(This article belongs to the Section Ocean Engineering)
View Full-Text   |   Download PDF [14319 KB, uploaded 12 September 2016]   |  

Abstract

For most of the ocean currents, such as the Kuroshio at east Taiwan, the Gulf Stream at east Florida and the Agulhas Current at southeast Africa, the depth of the seabed is generally deeper than one hundred meters, some waters of which can even reach one thousand meters. In such deep waters, the design of the turbine, as well as the anchoring system shall have special features so that existing ocean engineering technologies can be applied and the engineering cost can be lowered. Thus, as regards design, in addition to the analysis of the interaction between turbine and current, priority shall also be given to the design of the anchoring system of the turbine. To address the concerns, the authors propose an ocean turbine featured as follows: (1) it can be anchored in deep waters with a single cable; (2) it can generate high power in a current of moderate flow speed while producing low drag; (3) it can be self-balanced against current disturbance; (4) it is shrouded to enhance power efficiency; (5) the dynamic variations due to the interaction between the turbine and current are small. All of these features are confirmed with the computational results, leading to a detailed design of the turbine structure. If the easy-to-install high-efficiency shrouded turbines, having the capability to self-balance and requiring minimum maintenance effort, are successfully developed, the power supply pressure in Taiwan can be greatly alleviated. The Kuroshio was chosen as the typical current for the present dynamic analysis because, firstly, the flow characteristics of Kuroshio are similar to those of other large-scale currents mentioned above, and secondly, the data of Kuroshio are highly available to us so that a thorough analysis can be done. View Full-Text
Keywords: energy reserves; supply and demand; energy storage energy reserves; supply and demand; energy storage
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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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Chang, L.-Y.; Chen, F.; Tseng, K.-T. Dynamics of a Marine Turbine for Deep Ocean Currents. J. Mar. Sci. Eng. 2016, 4, 59.

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