本研究主要探討的對象為小型軸流風扇，軸流風扇應用於散熱方面的實例不勝枚舉，但是對於如何評判風扇的優劣，則是一個非常困難的議題；本研究以Joukowski 翼型為設計的基底，繪製出兩種外型大小相同但是扭轉角度不同的3-D 軸流風扇之外型，以及模擬風洞整體測試流道的邊界，改變不同流量、轉速及紊流理論模式，藉由電腦數值計算軟體加以模擬，分析風扇整體流場的分佈，以及預測出風扇性能曲線，透過與實驗量測之數據加以比較，再由各種不同紊流模式中，判別出適合運用在風扇流場中的模式。

This thesis studies to simulate the axial flow fans by using the CFD software. Designing two geometries types of axial flow fans which had different twist angles and the same contour（70×70×15 mm）with the Joukowski airfoil; then, defining the boundaries shapes identical with the experimental instrument.
In the part of numerical calculation, varying the rotation speed （rpm）,volume flow rate（CFM）and seven types of turbulence models to simulate the flow fields and evaluate the axial flow fans performance curves. Utilizing the comparison of the experimental and simulate results to provide the appropriate turbulent models to periodic the performance curve precisely.

摘要................................................Ⅰ
目錄................................................Ⅱ
圖目錄..............................................Ⅴ
表目錄..............................................Ⅶ
符號說明............................................Ⅷ
第一章 緒論..........................................1
1.1 簡介.............................................1
1.2 國內外研究情形（文獻回顧）.......................3
1.3 研究動機與目的...................................6
第二章 葉片幾何形狀設計..............................7
2.1 基本設計參數.................................... 7
2.2 理想葉型及重要參數..............................12
2.3 風扇移熱原理....................................14
2.4 風扇性能曲線選擇................................15
2.5 風扇效率........................................16
2.6 葉型之選擇......................................16
2.7 葉型產生器之利用................................20
2.8 格點建立及設定..................................21
2.9 格點測試........................................23
第三章 計算方法.....................................24
3.1 數值模擬軟體簡介................................24
3.2 假設條件........................................25
3.3 邊界條件........................................27
3.3 統御方程式......................................28
3.4 紊流模式理論....................................28
（1）Bladwin-Lomax 零方程式模式.....................28
（2） K-epsilon 雙方程式模式........................31
3.5 數值分析方法....................................35
3.5-1多重網格法（Multigrid）........................35
3.5-2前處理方法.....................................36
3.6改變之參數 ......................................39
3.7實驗方法.........................................39
3.7-1風扇性能量測規範 ..............................39
3.7-2風扇性能量測設備...............................40
第四章 數值模擬結果.................................41
4.1風扇葉型1之設定..................................41
4.2風扇葉型1之壓力場模擬............................42
4.3風扇葉型1之流量模擬..............................45
4.4風扇葉型1之性能曲線圖............................48
4.5風扇葉型2之設定..................................52
4.6風扇葉型2之壓力場模擬............................53
4.7風扇葉型2之流量模擬..............................55
4.8風扇葉型2之性能曲線圖............................57
第五章 結論與建議...................................61
5.1結論.............................................61
5.2建議.............................................63
參考文獻............................................64
附錄A幾何形狀定義圖.................................67
附錄B流量定義及轉換.................................68

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