- 學位論文
薄片型雙曲葉片於提升水平軸風力機系統性能之研究
Study on the enhanced performance of a horizontal-axis wind turbine system with flake-type double-curvature blades
摘要
本論文完成薄片型雙曲葉片於水平軸風力機系統性能之研究。主要目的在探討不同風速下，薄片型葉片導風板曲率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曲率之雙曲葉片，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ANSYS軟體模擬應力分布以分析葉片變形量，並使用STAR-CCM+軟體進行流體動力學模擬以分析速度、壓力及流線，藉以了解風力機系統動態行為之成因。 研究結果發現，雙曲葉片之設計確實能夠降低葉片在受風時的變形，於特定主葉片曲率時，機械能源、電力能源及轉換效率在不同風速下可隨導風板曲率半徑增加而增加，至一極大值後即下降。然而，在較大曲率半徑時，具導風板曲率葉片之風力機系統未必比無導風板曲率葉片之系統有較佳的性能表現。因此，考慮具曲率之導風板一般可提升風力機系統之性能，而此性能在某一特定曲率下存在一極佳值。
並列摘要
This thesis conducts a study on the horizontal-axis wind turbine system with flake-type double-curvature blades. The main purpose is to investigate the influence of wind deflector curvature of flake-type blade on its mechanical energy, electrical energy, and conversion efficiency for different wind speeds. First, the double-curvature blades are designed with different curvatures by using flake-type galvanized iron sheets. Second, all the blades are connected to the rotor hub and combined to the generator. Third, the wind speed, rotational speed, torque, and power generation are measured in the wind tunnel testing system, so as to calculate the horizontal-axis wind turbine system performance data at different wind speeds. In the final step of this study, ANSYS is used for simulating the stress distribution so as to analyze the deformation of blade. Moreover, STAR-CCM+ is used for fluid dynamic simulation to analyze the velocities, pressure, and streamlines in order to find out the cause of dynamic behavior of the wind turbine system. Results show that the design of double-curvature blades can certainly help in improving upon the deformation of blade under wind action and that, when the wind deflector curvature radius increases at a fixed principal blade curvature, the mechanical energy, electrical energy, and conversion efficiencies may increase to their maxima and then decrease for different wind speeds. However, at larger curvature radii, a system with double-curvature blades does not necessarily have a better performance than that with single-curvature blades. As a result, considering the wind deflectors with curvature in general magnifies the performance of the system. Also, the performance has an optimum value for a particular curvature.