自從西元1,970年兩次石油能源危機之後，環境污染和氣候異常等兩大議題就成為全世界關心之議題，目前再生能源的發展趨勢正隨著風機之運轉逐漸變得更有吸引力，這是因為風力發電具有豐沛、潔淨和燃料免費之特色，今日興建風力電廠已成為我國能源發展之重要標的。本研究以國家『水與綠計畫』為研究動機，以自行設計之三種不同翼尖，利用FLUENT 6.1.22之有限元素法進行數值模型之建立和計算，以通過葉輪質量流率和極限風速為模擬條件，來分析各種扭轉角度在不同風速下之流場情形與比較。在數值模擬之結果方面，扭轉角度介於-15~-25度之間都有不錯之數值，但以-25度最好，比較扭轉角-25和0度在葉輪固定轉速10 RPM和風速15 m/s情況下之數值，葉輪可用風力可提升17%，質量流率增加14,729 kg/s；其他在設定停止和啟動運轉之指定風速間均獲得良好之改善，且可以降低入口風速在數值模型中對於翼尖極限風速之影響，減少風能密度流失、增加葉輪獲得可用風力，對於風機效能之提升幫助頗大。

Since the second energy crises happened in 1970s, environment pollution and weird climate have become the important tasks in the world. Therefore, while the wind turbine started running, the trend of developing the renewable energy became more attractive than ever. So far, building the wind power plant becomes one of the most promising projects for Taiwan to develop the whole country’s energy resources after evaluating the wind energy’s characters like its clean and abundant resource without any fuel cost. The motivation of this research is based on the National Water and Green project proposed by government in Taiwan. In this research, three HAWTs (horizontal axial wind turbine) with different blade tips are designed and evaluated their power output and flow patters by taking advantage of the CFD code (Fluent). Then, various twists on the impeller blade are included to enhance the power generation of HAWT. The comparing criterions are the extreme wind speed at the blade tip and mass flow rate crossing the rotor. According to the numerical results, the power outputs of wind turbine are pretty good for the twist angle ranging from -15 to -25 degrees. However, the best result is presented at the case of -25 degree. By comparing the calculated outcomes of HAWTs operating at 15 m/s wind velocity and 10 rpm rotor speed, the improvements on the average power efficiency and airflow rate are 17% and 14,729 kg/s for the twist angle changing from 0 to -25 degrees. Moreover, several wind speeds ranging from the cut-in to cut-out wind speeds are considered in this study. It is concluded that the case of -25 degrees yields a better performance and a smaller extreme wind speed at blade tip than the case of zero twist for all wind speeds considered here.

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