臺灣博碩士論文加值系統

以G5面板工廠傳送系統軌道台車引起尾流氣流為研究主題，利用計算流體力學模擬氣流路徑，推論微污染物如何進行污染，進而利用尾流抑制或隔離控制。微污染物吸入污染產品，主要取決於台車後方區域所引起尾流之負壓吸力大小與流線路徑，本文利用被動式控制，以控制棒原理改變尾流特性，控制導流板之不同位置、角度、長度幾何不同，有效控制尾流產生不同特性。
使用GAMBIT建構網格、FLUENT迭代運算、TECPLOT進行後處理，模擬軌道台車引起尾流效應，依台車特性五大因子進行分析，分別為卡門渦街頻率、尾流影響區域、史卓賀數、局部與全域流線特性進行分析，針對未加裝與加裝導流板模擬結果差異性分析說明。
在下方加裝15度為傾斜導流板最佳角度，長度0.6公尺改善效果較0.3m更佳，台車底部氣流會順著下方15度傾斜導流板噴出，使抑制微污染物逆時針渦流能持續存在，持續抑制台車上方順時針與後方順時針渦流產生剝離連接，使台車上移載產品不易受到污染。

This study investigates the wake flow induced by rail vehicle within the transport system of G5 panel manufacturers. The flow path is numerically simulated to visualize the transfer of micro-contaminants for further implementation of wake suppression or separation control. Product contamination by micro-contaminants is caused by negative pressure distribution of the wake flow and flow streamlines behind the rail vehicle. Passive control system is introduced in the present study. By using control rod, characteristics of wake flow are changed. Various characteristics of wake flow, which effectively affected by different location, angle, and length variation off low guide plate,
are examined.
Using GAMBIT for grid generation, FLUENT for iterative computation, and TECPLOT for post-processing, simulation of wake flow induced by rail vehicle is analyzed in accordance with the five characteristics of rail vehicle, namely Karman vortex street frequency, affecting area of wake flow, Strouhal number, and streamline distribution. In comparison with the simulation of rail vehicle with and without flow guide plate, difference analysis is discussed.
In terms of flow guide plate fixed on the tail of rail vehicle, the best angle of inclination is 15 degrees and its length of 0.6 meter demonstrates better improvement than 0.3 meter. Airflow at the bottom of rail vehicle is expelled from the flow guide plate with inclination of 15 degrees, producing counterclockwise vortex which inhibits micro-contaminants. The continuing presence of the counterclockwise vortex repeatedly blocks the connection between clockwise vortex at the top of rail vehicle and clockwise vortex shedding containing micro-contaminants at the rear, reducing the risk to contaminate products on rail vehicle.

明志科技大學碩士學位論文指導教授推薦書 i
明志科技大學碩士學位論文口試委員審定書 ii
明志科技大學學位論文授權書 iii
誌謝 iv
中文摘要 v
英文摘要 vi
目錄 vii
符號索引 ix
表圖目錄 x
第一章 緒論 1
1.1 研究背景 1
1.2 研究動機 2
1.3 遭遇微污染物問題分析 2
1.4 文獻回顧 4
1.5 研究目的與方法 8
第二章 數值分析 9
2.1計算流體力學軟體簡介 9
2.2統御方程式 11
2.3 GAMBIT建立網格 13
2.4離散化 14
2.5邊界條件及初始條件 15
2.6數值方法 16
2.7數值模擬 17
第三章 模擬方法 18
3.1卡門渦街頻率取樣 18
3.2尾流區域平均壓力 19
3.3史卓賀數 20
3.4雷諾數 20
3.5流線圖 20
第四章 結果與討論 21
4.1軌道台車未加裝導流板案例 21
4.2軌道台車加裝不同導流板案例 22
4.2.1卡門渦街頻率 22
4.2.2尾流影響區域 23
4.2.3史卓賀數與雷諾數關係 24
4.2.4局部流線圖觀察 26
4.2.5全域流線圖觀察 27
4.2.6導流板幾何形狀分析 28
4.3軌道台車未加裝與加裝導流板案例差異性 29
第五章 結論與建議 32
參考文獻 34

[1] 龍隆無塵室科技股份有限公司 (2011)。“無塵室簡介”。上網日期：民100年09月30日。網址：http://www.cleanroom.com.tw/html/news/new-1.htm
[2] 戴士偉 (2004)。“計算流體力學技術應用於改進熱流工程教學之研究”。國立清華大學工程與系統科學系博碩士論文。
[3] J. Moureh, D. Flick (2005). “Airflow characteristics within a slot-ventilated enclosure”, International Journal of Heat Fluid Flow, Vol. 26, pp. 12-24.
[4] 陳念祖 (2001)。“高架地板置換式自然通風對室內通風效率之影響”。國立成功大學建築系碩士論文。
[5] S.J.Yang (2003). “An arbitrary Lagrangian–Eulerian finite element method for interactions of airflow and a moving AGV in a cleanroom”, Finite Elements in Analysis and Design, Vol. 39, pp. 521-533.
[6] 曹志明、胡石政 (2006)。“自動導引車對裝置高架地板並內含製程設備之無塵室三維流場影響分析”。電子月刊(第十二卷第五期)。
[7] H. Sakamoto, H. Haniu, Y. Obata, S. Matubara (1994). “Optimum Suppression of Fluid Forces Acting on a Circular Cylinder and Its Effectiveness(Controlled by a Fine Flat Plate)”, JSME International Journal, Ser. B, pp. 369-376.
[8] Varaprasad Patnaik, Aswatha Narayanaa, Seetharamub (1999). “Numerical simulation of vortex shedding past a circular cylinder under the influence of buoyancy”, International Journal of Heat and Mass Transfer, Vol. 42, pp. 3495-3507.
[9] C.H. Kuo, L.C. Chiou, C.C. Chen (2007). “Wake flow pattern modified by small control cylinders at low Reynolds number”, Journal of Fluids and Structures, Vol. 23, pp. 938-956.
[10] 郭正雄 (2002)。“具有小間距與不同排列的雙圓柱尾流特性之實驗研究”。國科會計畫編號 NSC91-2212-E005-014。
[11] S.C. Yen, J.H. Liu (2011). “Wake flow behind two side-by-side square cylinders”, International Journal of Heat and Fluid Flow, Vol. 32, pp. 41-51.
[12] Hiroshi Suzuki, Yoshiaki Inoue, Toshihiko Nishimura, Kazuhisa Fukutani, and Kenjiro Suzuki (1993). “Unsteady flow in a channel obstructed by a square rod (crisscross motion of vortex)”, Heat and Fluid Flow, Vol.14, No. 1.
[13] L.L. Shi, Y.Z. Liu, J.J. Wan (2010). “Influence of wall proximity on characteristics of wake behind a square cylinder: PIV measurements and POD analysis”, Experimental Thermal and Fluid Science, Vol. 34, pp. 28-36.
[14] Ian Taylor, Marco Vezza (1999). “Prediction of unsteady flow around square and rectangular section cylinders using a discrete vortex method”, Journal of Wind Engineering and Industrial Aerodynamics, Vol. 82, pp. 247-269.