本研究主要利用數值模擬與風洞實驗探討升/阻力混合型水平軸風力機葉片(風罩型葉片)性能之失速特性並以田口方法設計實驗參數組合，以較精簡的次數找尋適合於變速型水平軸式風力機風罩型葉片最佳幾何參數設計。
從數值模擬及風洞實驗結果發現，其最佳風罩型葉片參數可用於葉片元素動量理論之葉片，改善葉片低轉數失速之特性並對於葉片扭矩值及效率有所提升。
利用數值模擬觀察葉片表面之流場現象，可發現具有風罩之葉片會在葉片低轉數時在風罩處減少邊界層之分離，此一效應也為其葉片在低轉數時扭矩值的來源。這現象可證明利用於流場控制特性於低轉速情況下來提升水平軸式風力機葉片性能。

關鍵字: 水平軸風力發電機，升/阻力混合型葉，數值模擬，風洞實驗

In this study, the research is focused on the numerical simulation and wind tunnel experiment of Lift/Drag mixed type blades (wind hook) performance at the stall region of small-scale horizontal axis wind turbine with variable rotational speed. Taguchi Method has been used to set up the numerical experiments in search of a set of geometric parameters of wind hook on blades.
From numerical simulation and wind tunnel experimental In this study, the research is focused on the numerical simulation and wind tunnel experiment of Lift/Drag mixed type blades (wind hook) performance at the stall region of small-scale horizontal axis wind turbine with variable rotational speed. Taguchi Method has been used to set up the numerical experiments in search of a set of geometric parameters of wind hook on blades.
From numerical simulation and wind tunnel experimental results showed that the optimal parameters of the wind hook on blades has higher C_p and torque than other without the wind hook rotor models at the lower tip speed ratio.
From observing the flow fields on the Lift/Drag mixed type blades (wind hook), it can be seen that the stall phenomenon will be delayed in the blade-root. The delay of the stall can improve the performance in low rotational speed for HAWT, and this result show out that the flow control in the blade is possible.

Keywords: Horizontal Axis Wind Turbine, Design of Lift/Drag Mixed type Blade, Numerical simulation, wind tunnel test

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