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A Twin Unidirectional Impulse Turbine for Wave Energy Conversion

Journal of Thermal Science 2011年第5期20卷 394-397页

作者： Manabu Takao akiyasu takami Shinya Okuhara Toshiaki Setoguchi Matsue College of Technology 14-4 NishiikumaMatsueShimane 690-8518Japan Saga University 1 HonjoSagaSaga 840-8502Japan

A twin unidirectional impulse turbine has been proposed in order to enhance the performance of wave energy *** turbine system uses two unidirectional impulse turbines and their flow direction is different from each ***,the turbine characteristics have not been clarified to *** performances of a unidirectional impulse turbine under steady flow conditions were investigated experimentally by using a wind tunnel with large piston/cylinder in this ***,efficiency of the twin impulse turbine have been estimated by a quasi-steady analysis using experimental results.

关键词：冲击式水轮机单向波能转换涡轮机流动方向轮机系统准稳态活塞

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Wells Turbine for Wave Energy Conversion —Improvement of the Performance by Means of Impulse Turbine for Bi-Directional Flow

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Open Journal of Fluid Dynamics 2013年第2期3卷 36-41页

作者： Shinya Okuhara Manabu Takao akiyasu takami Toshiaki Setoguchi Department of Mechanical Engineering Matsue College of Technology Matsue Japan Institute of Ocean Energy Saga University Saga Japan Techno Center Matsue College of Technology Matsue Japan

Wells turbine has inherent disadvantages in comparison with conventional turbines: relative low efficiency at high flow coefficient and poor starting characteristics. To solve these problems, the authors propose Wells turbine with booster turbine for wave energy conversion, in order to improve the performance in this study. This turbine consists of three parts: a large Wells turbine, a small impulse turbine with fixed guide vanes for oscillating airflow, and a generator. It was conjectured that, by coupling the two axial flow turbines together, pneumatic energy from oscillating airflow is captured by Wells turbine at low flow coefficient and that the impulse turbine gets the energy at high flow coefficient. As the first step of this study on the proposed turbine topology, the performance of turbines under steady flow conditions has been investigated experimentally by model testings. Furthermore, we estimate mean efficiency of the turbine by quasi-steady analysis.

关键词： Fluid Machinery Wells Turbine Impulse Turbine Wave Energy Conversion Ocean Engineering

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A Twin Unidirectional Impulse Turbine for Wave Energy Conversion

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Open Journal of Fluid Dynamics 2012年第4期2卷 343-347页

A twin unidirectional impulse turbine has been proposed in order to enhance the performance of wave energy plant. This turbine system uses two unidirectional impulse turbines and their flow direction is different each other. However, the effect of guide vane solidity on the turbine characteristics has not been clarified to date. The performances of a uni- directional impulse turbine under steady flow conditions were investigated experimentally by using a wind tunnel with large piston/cylinder in this study. Then, mean efficiency of the twin impulse turbine in bidirectional airflow has been estimated by a quasi-steady analysis using experimental results in order to investigate the effect of guide vane solidity on the performance.

关键词： Fluid Machinery Impulse Turbine Wave Energy Conversion Ocean Energy

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A Twin Unidirectional Impulse Turbine for Wave Energy Conversion—Effect of Fluidic Diode on the Performance

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Open Journal of Fluid Dynamics 2014年第5期4卷 433-439页

作者： Shinya Okuhara Manabu Takao Hideki Sato akiyasu takami Toshiaki Setoguchi Support Center for Practical Education National Institute of Technology Matsue College Matsue Japan Department of Mechanical Engineering National Institute of Technology Matsue College Matsue Japan Advanced Engineering Faculty National Institute of Technology Matsue College Matsue Japan Institute of Ocean Energy Saga University Saga Japan

As a system using a conventional unidirectional air turbine in oscillating water column (OWC) based on a wave energy plant, a twin unidirectional impulse turbine topology has been suggested in previous studies. However, the average efficiency of the suggested twin turbine is considerably lower than that of a conventional unidirectional turbine in this topology because reciprocating air flow can’t be rectified adequately by a unidirectional turbine. In order to improve the efficiency, using fluidic diode is discussed. In this study, two different fluidic diodes were discussed by computational fluid dynamics (CFD) and a wind tunnel test. Further, its usefulness is discussed from a view point of the turbine efficiency. The fluidic diode was shown to improve rectification of the topology. However, it needs more improvement in regards to its energy loss in order to enhance the turbine efficiency.

关键词： Fluidic Diode Twin Unidirectional Turbine Wave Energy Conversion Oscillating Water Column

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