| Summary: | 碩士 === 中原大學 === 機械工程研究所 === 102 === This thesis conducts a study on the performance of a horizontal-axis wind turbine system with flake-type blade winglet. Also, an analysis of the effect of blade curvature is performed. The main purpose is to investigate the influence of flake-type blade winglet on its mechanical energy, electrical energy, and conversion efficiency for different wind speeds. First, we design the blades with different winglet curvatures by using flake-type galvanized iron sheets. Second, we connect all the blades to the rotor hub and combine it to the generator. Third, we measure the wind speed, rotational speed, torque, and power generation in the wind tunnel testing system, so as to calculate the horizontal-axis wind turbine system performance data at different wind speeds. Finally, we use STAR-CCM+ for simulation to analyze the blade surface pressure, velocities, and streamlines, so as to realize the cause of dynamic behavior of the wind turbine system.
Results show that, when the value of the winglet curvature radius increases at a fixed blade curvature, all the mechanical energy, electrical energy, and conversion efficiency increase to their maxima and then decrease for different wind speeds. At a further larger radius, a system with winglet does not necessarily have a better performance than that without winglet. It is also found that changing the blade curvature radius can further magnify the system performance. The performance also has an optimum value for a particular curvature radius.
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