本論文完成具薄片型葉片小翼之水平軸風力機系統性能的研究,過程中並對葉片曲率效應進行分析。主要目的在探討不同風速下,薄片型葉片加裝小翼對水平軸風力機的機械能源、電力能源及轉換效率之影響。首先以鍍鋅薄鐵片製作具不同小翼曲率之葉片,接著將其連接於轉子輪轂且結合於發電機上,並於風洞中進行風速、轉速、扭矩及發電量的量測,以計算不同風速下水平軸風力機系統性能之數據。最後使用STAR-CCM+模擬軟體分析葉片壓力、速度及流線,以了解風力機系統動態行為之成因。 研究結果發現,於特定葉片曲率時,機械能源、電力能源及轉換效率在不同風速下皆隨小翼曲率半徑增加而增加,至一極大值後便下降。然而,在較大半徑時,有小翼葉片則未必比無小翼葉片有較佳的性能表現。此外,改變葉片曲率半徑可進一步提升風力機系統之性能,此性能在某一特定曲率半徑下亦存在一極佳值。
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.