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Sustainability 2016, 8(8), 756; doi:10.3390/su8080756

Experimental Research on Primary and Secondary Conversion Efficiencies in an Oscillating Water Column-Type Wave Energy Converter

1
Institute of Ocean Energy, Saga University, 1, Honjo, 840-8502 Saga, Japan
2
Department of Mechanical Engineering, Matsue National College of Technology, 14-4, Nishiikuma, Matsue, 690-8518 Shimane, Japan
*
Author to whom correspondence should be addressed.
Academic Editors: Diego Vicinanza and Mariano Buccino
Received: 29 June 2016 / Revised: 26 July 2016 / Accepted: 2 August 2016 / Published: 5 August 2016
(This article belongs to the Special Issue Wave Energy Converters)
View Full-Text   |   Download PDF [3443 KB, uploaded 5 August 2016]   |  

Abstract

For the practical application of a fixed oscillating water column (OWC)-type wave energy converter, it is necessary to develop a design method which can consider the characteristics of incident wave motion, the motion of the internal free surface affected in the structure such as a partly submerged wall, the fluctuation of air pressure in an air chamber, and the rotation of the air turbine. On the other hand, the impulse turbine as the secondary conversion device in the OWC unit is expected to achieve high efficiency. In this paper, firstly, the steady air flow tests for a single-impulse turbine were conducted to grasp the characteristics of the turbine without the effect of water waves. Secondly, the 2-dimensional wave tank tests in regular waves for the performance evaluation of the fixed OWC-type wave energy converter with the same impulse turbine were conducted to obtain the data needed to make this design method. As the results, the effects of the air chamber length and the guide vane’s setting angle on the primary and secondary conversion efficiencies are clarified experimentally. View Full-Text
Keywords: wave energy converter; oscillating water column; primary conversion; secondary conversion; impulse turbine wave energy converter; oscillating water column; primary conversion; secondary conversion; impulse turbine
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MDPI and ACS Style

Murakami, T.; Imai, Y.; Nagata, S.; Takao, M.; Setoguchi, T. Experimental Research on Primary and Secondary Conversion Efficiencies in an Oscillating Water Column-Type Wave Energy Converter. Sustainability 2016, 8, 756.

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