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International Journal of Rotating Machinery
Volume 3, Issue 4, Pages 233-238

Air-Turbine with Self-Pitch-Controlled Blades for Wave Energy Conversion (Estimation of Performances in Periodically Oscillating Flow)

1Department of Mechanical Engineering, Saga University, 1 Honjo-Machi, Saga-shi, Saga 840, Japan
2Department of Aeronautical Engineering, The Queen's University of Belfast, Belfast, Northern Ireland, UK

Received 23 May 1997; Revised 25 May 1997

Copyright © 1997 Hindawi Publishing Corporation. 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.


In the development of an air-turbine with self-pitch-controlled blades for wave energy conversion, existence of hysteretic characteristics in a reciprocating flow has been examined. In order to clarify the validity of the analysis, a numerical simulation has been made by use of the experimental results obtained from a steady unidirectional flow condition. The comparison between the analysis and experiment has shown that the quasi-steady analysis is reasonable accurate for predicting the performance. The running and starting characteristics have also been investigated analytically taking into account the blade turning process during pitch.