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研究生： 莊惠婷
Hui-Ting Chuang
論文名稱： 新型複合式風扇以及流線形鰭片散熱座之數值與實驗整合研究
An Integrated Numerical and Experimental Study of the Novel Complex Fan and Streamlined Heat Sink Assembly
指導教授： 林顯群
Sheam-Chyun Lin
口試委員: 陳恩宗
En-Tsung Chen
陳呈芳
none
蔡博章
none
學位類別： 碩士
Master
系所名稱： 工程學院 - 機械工程系
Department of Mechanical Engineering
論文出版年： 2005
畢業學年度： 94
語文別： 中文
論文頁數： 203
中文關鍵詞： 風扇 、流線形 、鰭片
外文關鍵詞： Fan, Sink, Streamline
相關次數： 點閱：294  下載：29 
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    • 摘 要
    由於筆記型電腦之空間限制，加上內部電子元件之密集排列，使得CPU所釋出的熱量更難以被排出系統外，因此本研究開發一款結合離心扇之高壓及橫流扇之低噪特性的複合式風扇，其大小為60×60×15 mm3，並以數值模擬方法來觀察分析各參數對風扇性能之影響，再加以實驗量測作驗證。最後再依據風扇之出口流線方向來設計流線形鰭片散熱座，以提高整體散熱模組之效能。複合風扇之幾何參數的改變包含了進風口直徑、背板型式、舌部間隙、葉輪高度及遮蔽效應等，其中以改變葉輪高度對於風扇性能之提升有最佳之成效，流量較原始設計提升了10.9 % (5.3CFM)，靜壓則增加13.5 % (8.48mm-Aq)。此外，由實驗與模擬之比對結果，可以看到兩者均呈現相同之趨勢，因此證實數值模擬之方法的確有其準確性。在散熱座方面，除了依據風扇出口流場來設計流線型鰭片散熱座外，再設計一款等散熱面積的直板型鰭片散熱座以作為對照組。實驗結果顯示流線型之熱阻值為1.154℃/W，而直板型為1.228℃/W且溫度較流線型高了2℃，結果證實流線型鰭片確實比傳統直板型鰭片有較佳之散熱效果。

    Abstract
    A streamlined heat sink assembly, which consists of the cooling fan and the streamlined fins, is designed simultaneously for meeting the thermal task of laptop computers in this research. At first, a systematic scheme including CFD simulation, mockup fabrication, and experimental verification, is established to generate a complex fan. This novel blower (60×60×15mm3), featured with the characteristics from both centrifugal fan and cross-flow fan, provides a sufficient airflow with high-pressure rise under the space limitation of notebooks. Moreover, a combined effort from numerical simulation and experimental verification is executed to perform the parametric study on the geometric variables for obtaining an optimum fan design. The parameters considered here include inlet diameter, shape of rear wall, tongue clearance, throat gap, and the height of rotor. In additions, prototypes are made by CNC machine and tested to serve as references for numerical verification. This parametric study indicates that increasing the rotor height is the key factor to enhance the fan aerodynamic performance. Also, experimental results verify that the optimum fan design operating at 3,000 rpm delivers 5.3-CFM airflow with 8.48mm-Aq static-pressure.
    Thereafter, to match the flow pattern appropriately and minimize the resistance to the passing airflow, the streamlined fin geometry is generated with the aids of the detailed, numerical flow visualization at the fan outlet. Under the same operating conditions, experimental outcome shows that this strteamlined fin geometry yields a slightly better thermal resistance (1.154℃/W) compared to the traditional vertical fin (1.228℃/W), which represents a reduction of 2℃ on CPU case temperature. In conclusion, this new design approach, which generates the new cooling fan type and fin simultaneously, offers a reliable alternative to enhance the thermal performance of heat sink assembly successfully for meeting the thermal challenge of the high-performance notebooks.

    目 錄 中文摘要.........................................I 英文摘要.........................................II 誌謝.............................................IV 目錄.............................................V 圖索引...........................................VIII 表索引...........................................XIII 符號索引.........................................XV 第一章 緒論.......................................1 1.1 前言........................................1 1.2 文獻回顧....................................6 1.2.1 離心扇................................7 1.2.2 橫流扇................................9 1.2.3 散熱座................................15 1.3 研究動機與方法..............................18 第二章 複合式風扇設計.............................22 2.1 複合扇設計..................................22 2.1.1 葉輪設計..............................22 2.1.2 外框設計..............................25 2.2 複合扇之網格建立............................26 第三章 數值方法...................................36 3.1 流場統御方程式..............................36 3.2 紊流模式....................................38 3.3 數值方法....................................40 3.3.1 離散法則..............................40 3.3.2 上風差分法............................41 3.3.3 SIMPLE解法理論........................43 3.4 數值邊界件設定..............................46 第四章 實驗設備及儀器.............................49 4.1 風扇性能量測設備............................49 4.2 噪音量測設備與環境..........................52 4.2.1 聲壓量測系統..........................52 4.2.2 量測環境..............................52 4.3 散熱器性能量測設備與環境....................54 4.3.1 散熱器性能量測設備....................54 4.3.2 恆溫環境系統..........................57 第五章 複合扇之數值模擬分析.......................60 5.1 原始設計之流場分析..........................60 5.1.1 Z方向剖面.............................62 5.1.2 θ方向剖面............................69 5.2 不同入風口直徑..............................78 5.2.1 Z方向剖面.............................79 5.2.2 θ方向剖面............................79 5.3 背板型式之變化..............................87 5.3.1 Z方向剖面.............................90 5.3.2 θ方向剖面............................104 5.4 變更舌部間隙................................108 5.4.1 Z方向剖面.............................108 5.4.2 θ方向剖面............................114 5.5 變更葉輪高度................................114 5.5.1 Z方向剖面.............................119 5.5.2 θ方向剖面............................119 5.6 複合扇之遮蔽效應............................119 5.6.1 θ方向剖面............................126 5.6.2 Z方向剖面.............................126 第六章 複合扇之實驗結果與討論.....................136 6.1 變更入風口直徑..............................138 6.2 變更背板型式................................141 6.3 變更舌部間隙................................144 6.4 變更葉輪高度................................147 6.5 風扇遮蔽效應................................150 第七章 整體散熱模組之實驗結果.....................157 7.1 流線型鰭片設計..............................157 7.2 散熱座之熱阻實驗............................163 7.2.1 不同鰭片外型之散熱座熱阻實驗..........168 7.2.2 不同加工方式之直板型散熱座熱阻實驗....168 第八章 結論與建議.................................176 8.1 結論........................................176 8.2 建議........................................178 參考文獻..........................................180 作者簡介..........................................186

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