| Summary: | 碩士 === 國立臺灣大學 === 應用力學研究所 === 101 === This research presents dynamic analyses of vertical-axis water turbines, which include the characteristics and the performance of turbines. Combined 4 helical turbines as one turbine set, the turbines are designed as a power plant to capture the tidal energy in Matsu, Taiwan.
In this research, two typical kinds of vertical-axis water turbines are discussed: one is variable pitch water turbine, and another is helical water turbine. By aerodynamic theory, the basic characteristics of the vertical turbines are shown in this work; then the Computational Fluid Dynamic (CFD) techniques were used to simulate the variable pitch water turbine and the helical water turbine in 2D and 3D flow field domain respectively. The result shows that both two turbines could diminish the mechanical vibration affected from water flow in contrast with traditional fixed and straight blade vertical-axis water turbines
From the CFD result, the turbines combination was descripted. Two turbines with the same direction of 60 degree phase difference are calculated to have the smallest force and moment vibration; in addition, four turbines with the symmetrical direction of zero phase difference, which based on the two turbine set descripted above, are calculated to have the best performance.
Take Matsu Islands for instance, the tidal energy potential on the bay region in Beigan and Nangan were calculated. While developed, the tidal energy in Matsu could generate 28.7GWh per year, which is 42.6%requirement of Matsu region in 2011.
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