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International Journal of Rotating Machinery
Volume 2012, Article ID 717398, 10 pages
http://dx.doi.org/10.1155/2012/717398
Review Article

Air Turbines for Wave Energy Conversion

1Department of Mechanical Engineering, Matsue College of Technology, 14-4, Nishiikuma-cho, Matsue-shi, Shimane 690-8518, Japan
2Institute of Ocean Energy, Saga University, 1, Honjo-machi, Saga-shi, Saga 840-8502, Japan

Received 2 December 2011; Revised 4 April 2012; Accepted 11 April 2012

Academic Editor: Moon Chan Kim

Copyright © 2012 Manabu Takao and Toshiaki Setoguchi. 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.

Abstract

This paper describes the present status of the art on air turbines, which could be used for wave energy conversion. The air turbines included in the paper are as follows: Wells type turbines, impulse turbines, radial turbines, cross-flow turbine, and Savonius turbine. The overall performances of the turbines under irregular wave conditions, which typically occur in the sea, have been compared by numerical simulation and sea trial. As a result, under irregular wave conditions it is found that the running and starting characteristics of the impulse type turbines could be superior to those of the Wells turbine. Moreover, as the current challenge on turbine technology, the authors explain a twin-impulse turbine topology for wave energy conversion.