| Summary: | 碩士 === 國立中興大學 === 機械工程學系所 === 98 === In this study, the numerical method, employing Fluent/Ansys, is used to simulate the two-dimensional VAWT system driven by the wind. The VAWT system includes three blades separated by along the azimuthal direction. The chord length of each blade is 0.1m, with a airfoil profile of NACA0012. The rotating radius of the VAWT system is 0.4m. Three inflow speeds (5m/s、10m/s、15m/s) are employed to investigate the related aerodynamics of the VAWT system. Also, the effect of solidity on the performance of the VAWT is investigated at inflow speed of 10m/s. The value of solidity is varied by changing the rotating radius of the VAWT system, ranging between 0.25 and 0.5.The result shows that the higher the inflow speed, the larger the output power; and thus the power coefficient. The tip speed ratio ranges between 0.2 and 0.46. As the solidity increases up to 0.428, both the starting acceleration and the driving torque increase. Futher increase of the solidity will reduce the starting acceleration and the driving torque. This decrease is caused by the severe interfere of the wake of upwind with the downwind blades. The maximum power coefficient is found to be 12% at the solidity of 0.428.
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