臺灣博碩士論文加值系統

本文目的在建立個人電腦風扇的設計、數值計算和實驗之完整分析方法。首先經由軸流風扇的設計概念，設定出符合氣動力性質的風扇參數，並配合NACA的葉形，產生出所需的風扇葉形。接著利用數值模擬將此葉形之內部三維流場表現出來，做為改良葉形設計的初步判斷依據。經過參數一再修正，重覆初步的數值模擬過程，並判斷是否產生順暢之流場及符合需求之氣動力性能，經由此數值結果與設計參數之反覆修正，以確立所需之風扇設計。由最後確認的風扇葉形做參數變化，再藉由數值計算求得複雜的細部流場資訊，用以詳細分析所設計的風扇產生的流場變化。而且將導管(Duct)與槳罩(Spinner)加入計算，以探討間隙層(Tip Clearance)對葉片流場的影響，並研判影響效率的原因，以便日後修正得到更具效率的葉形。最後將葉形由CAD/CAM系統轉換成加工程式，經快速成型技術或加工機製成實體葉片，再利用AMCA風扇測試設備，進行精準量測以取得風扇之性能，作為數值模擬的比較之用。

The purpose of this study is to establish an integrated design scheme for an axial-flow cooling fan. This aerodynamic design procedure is comprised of design theory, numerical simulation, andexperimental verification. First of all, based on theoretical analysis, an axial-flow fan is constructed with the NACA airfoil; then, the flowfields associated with this construction, including the frame and rotating spinner, are simulated by solving a 3-D Navier-Stokes equation. The numerical outcomes yield the detailed flow phenomena inside the tip-clearance and blade passages, which can be used as the basis to modify tip-clearance and blade geometry. Thereafter, the entire configuration of the rotor is expressed in CAD/CAM format to manufacture the prototype. Finally, the aerodynamic performances and noise characteristics are executed in the AMCA test chamber and semi-anchoic chamber, respectively. In summary, a comprehensive analysis and design scheme is furnished by integrating the above procedures to serve as a reliable design tool for an axial-flow cooling fan.

目 錄
頁次
中文摘要i
英文摘要ii
誌謝iii
目 錄iv
圖索引vi
表索引viii
第一章 緒論1
1.1 前言1
1.2 文獻回顧3
1.3 研究動機與目的6
1.4 本文架構7
第二章 扇葉設計9
2.1 NACA翼剖面設計9
2.2 扇葉設計14
2.2.1 扇葉理論推導14
第三章 數值方法24
3.1 統御方程式25
3.2 數值方法30
3.2.1 離散化方程式30
3.2.2 邊界條件與初始條件32
第四章 數值分析33
4.1 數值格點之建立33
4.2 風扇數值模擬39
4.2.1 整體流場分析41
4.2.2 流量分析46
4.2.3 壓力等位圖分析53
4.2.4 壓力係數分析54
4.2.5 速度向量分析55
第五章 實驗結果65
5.1 實驗設備65
5.2 實驗結果69
第六章 結論與建議72
6.1 結論72
6.2 建議73
參考文獻74
符號索引78
作者簡介82

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