傳統流道式風機設計原理主要為增加入口截面積以提高氣流量，然而提升風速才是真正提高空氣動能的有效方式。本研究發現，桶形流道利用 Bernoulli 原理造成抽吸效應，可有效地提高流道內的氣流速度，並藉此提升風機效率。本研究更進一步改良固有的Complex演算法，並配合物件導向的最佳化程式介面，以及計算流體力學軟體模擬，對流道幾何外型進行最佳化設計。根據最佳化結果顯示，最適合此桶型流道的內部幾何形狀為一非傳統噴嘴，在最佳情況下可將氣流速度提升60% 以上。

　　以配備此最佳化噴嘴之桶型流道為基礎，本研究成功設計並製造出一部流道式風力發電機組，並經過CFD模擬及實地測試，證明確實能改善風機的工作流場，並將風機的動能擷取效率提高約80%。

　　Designs for conventional ducted wind turbines usually include a large inlet for more absorption of the air flow. However, the most efficient solution should be increasing the speed of wind. It has been observed that a bucket-shaped duct produces a sucking effect according to the Bernoulli’s Theorem, and thus significantly increases the wind speed inside the duct, while the efficiency of the wind turbine can be substantially enhanced. Moreover, the geometry of the duct is optimized by the combination of an improved Complex algorithm, an object-oriented optimizing program interface, and the simulations by CFD software. According to our studies, the optimal shape for the interior of the duct appears to be an unconventional nozzle, which extends the range of wind speed by 60%.

　　Based on this bucket duct equipped with the optimal nozzle, a wind power generator has been practically designed and constructed. The results of the field tests show that the proposed ducted turbine does improve the flow around the generator and thus increase its power extraction efficiency by about 80%.

誌　謝 0-1
摘　要 0-2
目　錄 0-4

第一章　緒論
1. 1. 風力發電概論 1-1
　1. 1. 1. 風力資源特徵 1-2
　1. 1. 2. 風力機簡介 1-3
　1. 1. 3. 風力機空氣動力學 1-8
　1. 1. 4. 風力機設計原理 1-10
　1. 1. 5. 風力機定址選擇 1-16
　1. 1. 6. 風力發電之經濟考量 1-17
　1. 1. 7. 風力發電之環境衝擊 1-19
　1. 1. 8. 總結 1-21
1. 2. 研究動機與目的 1-21
1. 3. 研究內容與方法 1-26
1. 4. 使用軟體簡介 1-29
1. 5. 論文內容架構 1-33

第二章　文獻回顧
2. 1. 流道式風機 2-1
2. 2. 最佳化演算法 2-8
2. 3. 最佳化外型設計 2-13
2. 4. 其他相關文獻 2-14
　2. 4. 1. 最佳化程式 2-14
　2. 4. 2. 風機定址 2-16
2. 5. 討論 2-19

第三章　理論背景
3. 1. 驅動盤概念 (Actuator Disc Concept) 3-1
3. 2. 轉子盤理論 (Rotor Disc Theory) 3-4
3. 3. 轉子葉片理論 (Rotor Blade Theory) 3-8
3. 4. 流體力學基本概念 3-14
3. 5. 討論 3-17

第四章　流道之 CAE 模型建構
4. 1. 桶型流道之 CFD 模型 4-1
　4. 1. 1. 基本假設 4-1
　4. 1. 2. 幾何外型建立 4-2
　4. 1. 3. 幾何參數討論 4-5
　4. 1. 4. 模擬結果討論 4-8
4. 2. 流道支架之 FEM 模型 4-16
　4. 2. 1. 基本模型架構 4-17
　4. 2. 2. 元素選用與網格分割 4-23
　4. 2. 3. 邊界條件與分析程序 4-24
　4. 2. 4. 材料常數 4-27
　4. 2. 5. 分析結果與討論 4-27
4. 3. 討論 4-29

第五章　流道外型最佳化設計
5. 1. 目標函數 5-1
5. 2. 演算法之改良 5-4
　5. 2. 1. 鎖死過程解析 5-5
　5. 2. 2. 預鎖警告 5-6
　5. 2. 3. 遜位機制 5-7
　5. 2. 4. 彈性節點數 5-8
　5. 2. 5. 標準測試函數 5-9
　5. 2. 6. 效率比較指標 5-12
　5. 2. 7. 新舊演算法之結果比較 5-13
　5. 2. 8. 與其它解鎖機制之比較 5-17
　5. 2. 9. 結論 5-19
5. 3. 最佳化問題計算 5-20
5. 4. 最佳化外型設計結果 5-22
5. 5. 結論 5-25

第六章　流道式風機架構
6. 1. 固定組各部件設計 6-1
6. 2. 可動組各部件設計 6-4
6. 3. 流道式風機之最終設計 6-13
6. 4. 設計之檢查與驗證 6-14

第七章　製造程序與實驗驗證
7. 1. 製造程序 7-1
　7. 1. 1. 支架 7-1
　7. 1. 2. 噴嘴 7-1
　7. 1. 3. 發電機 7-6
　7. 1. 4. 鐵籠主體 7-8
　7. 1. 5. 尾翼與布幕 7-9
　7. 1. 6. 組裝與配合 7-9
7. 2. 實驗裝置架設 7-10
7. 3. 結果與討論 7-12

第八章　總結、討論與建議
8. 1. 成果總結 8-1
8. 2. 研究與討論 8-2
8. 3. 未來研究方向 8-3

附錄
A. 程式架構 / 自動產生不同高度比之CFD網格: 附-1
B. 程式架構 / cubic spline計算: 附-3
C. 程式架構 / 自動產生不同噴嘴外型之CFD網格: 附-6
D. 程式架構 / Fluent軟體溝通介面 附-8

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