碩士 / 國立高雄海洋科技大學 / 造船及海洋工程研究所 / 105 / The ocean surface area is about 70% of the earth and the wave energy is one of the potential energy in the ocean renewable energy. The aim of this paper is to investigate the performance of an impulse turbine driven by the reciprocating air flow for ocean wave energy. Because the impulse turbine rotates in the same direction with reciprocating flow, it is suitable for wave energy conversion. In order to enhance the effect of energy conversion, a pair of guide vanes is installed nearby the inlet and outlet of impulse turbine. Thus, the airflow smoothly enters the impulse blades and enhances the performance and energy conversion efficiency.
In the numerical analysis, the computational fluid dynamics (CFD) software ANSYS Fluent is used to calculate the streamlines, the distributions of pressure and velocity near the turbine. The torque of the impulse turbine decreases with the rotating speed, at a fixed velocity of air flow. The preliminary results depict that the improvement of the performance of the turbine with guide vanes is about 153% and the maximal power coefficient is 0.3, as optimal rotating speed is 104.7rad/s. Furthermore, the optimal blade numbers of the guide vane and the turbine are 26 and 30, respectively. The influences of the diameter of turbine, the interspace between of turbine and guide vanes, and the height of the blade are also analyzed. The results further propose a useful foundation to design and develop the impulse turbine in power generation for ocean wave energy conversion.
| Identifer | oai:union.ndltd.org:TW/105NKIM0345006 |
| Date | January 2017 |
| Creators | CHEN,KAI-WEI, 陳凱威 |
| Contributors | YANG,MIN-HSIUNG, 楊敏雄 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 99 |
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