臺灣博碩士論文加值系統

本文針對離心風扇做設計及分析，設計了整體尺寸為75mm×70mm×12mm 之雙吸入式離心風扇，藉由田口法來針對扇葉進行最佳化運算。本文主要是運用計算流體力學（CFD）來對離心式風扇做數值化之模擬，從中了解各參數變化對扇葉流場及效率之影響，進而建立整個流場的格點，以達最佳化效果之設計及高效率運轉的目的，彌補傳統在設計上費時又費力的缺點，降低開發成本且提高產品的附加價值，使離心式風扇在市場上更具競爭力。

The subject of this thesis is about design and analysis of centrifugal fan . The purpose of centrifugal fan,design the double-entry centrifugal fan 75mm×70mm×12mm, use the Taguchi method for the blades. Numerical simulation of centrifugal fan is analyzed by using CFD, therefore let us realize how the variation of parameters affects the flow field and efficiency of the centrifugal fan from the simulation. Furthermore, we also build the nodes of flow field for the centrifugal fan in order to finding out the optimal design of high efficient one. By the method, the defect of time consuming traditional design can be improved as well as lowers the cost and upgrades the additional value. Then, the centrifugal fan will be out compete in the market.

摘 要.............................................i
英文摘要..........................................ii
誌 謝.............................................iii
目 錄.............................................iv
表 目 錄..........................................vi
圖 目 錄..........................................vii
符號說明..........................................ix
第一章緒 論.......................................1
1.1 前 言.........................................1
1.2 文獻回顧......................................2
1.2.1 離心式風扇方面..............................2
1.2.2 數值模擬方面................................5
1.3 研究動機及目的................................8
第二章葉輪設計的基本方法..........................10
2.1 離心式風扇設計................................10
2.1.1 離心式風扇的簡介............................10
2.1.2 離心式風扇之構造及分類......................12
2.1.3 葉輪基本方程式..............................14
2.2 蝸殼設計......................................19
2.3 實驗量測設備..................................20
2.3.1 風扇性能量測設備............................21
第三章數值方法....................................23
3.1 流場..........................................23
3.1.1 基本假設....................................23
3.1.2 基本統御方程式..............................24
3.1.3 標準k -e 模型方程式.........................25
3.2 數值理論......................................27
3.2.1 離散化方程式................................27
3.2.2 混合差分法（hybird differencing scheme).....29
3.2.3 SIMPLE 解法理論.............................31
第四章離心式風扇最佳化設計........................36
4.1 田口最佳化實驗計畫............................36
4.1.1 扇葉控制因子、水準及直交表設定邊界條件......41
4.2 流場數值分析..................................43
4.2.1 建立模型網格................................43
4.2.2 邊界條件設定................................47
4.2.3 數值穩定性..................................49
4.3 離心式風扇之數值模擬..........................50
4.4 數值模擬運算結果田口法比較....................60
4.5 扇葉樣品製作..................................64
4.5.1 量測結果....................................67
第五章結論與建議..................................68
5.1 結論..........................................68
5.2 建議..........................................69
參考文獻..........................................70
自 傳.............................................75

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