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系統識別號 U0026-2508201914563600
論文名稱(中文) 雙管式熱交換器三角翼渦流產生器之設計研究
論文名稱(英文) The Study on Designing the Delta Winglet Vortex Generators in Double-Pipe Heat Exchanger
校院名稱 成功大學
系所名稱(中) 系統及船舶機電工程學系
系所名稱(英) Department of Systems and Naval Mechatronic Engineering
學年度 107
學期 2
出版年 108
研究生(中文) 連家慶
研究生(英文) Jia-Ching Lien
學號 P16061041
學位類別 碩士
語文別 中文
論文頁數 69頁
口試委員 指導教授-黃正弘
口試委員-陳寒濤
口試委員-艾和昌
口試委員-李弘毅
中文關鍵字 拉凡格氏法  熱交換器  渦流產生器  最佳化設計 
英文關鍵字 Levenberg-Marquardt Method  Heat exchanger  Vortex generator  Optimal design 
學科別分類
中文摘要 本論文利用商業套裝軟體CFD-ACE+建立三角翼渦流產生器之三維模型,並透過拉凡格氏法(Levenberg-Marquardt Method)最佳化渦流產生器之外形參數,以提升熱交換器之效率為目的來反算出三角翼渦流產生器最佳化之形狀。
本研究以文獻[1]為設計基礎並將其延伸,探討三種不同參數設計,並使用反算設計問題預測最佳渦流產生器外形參數。案例一將渦流產生器之長度固定,預測寬度及仰角,並與文獻[1]之結論相比,探討其外形改變對效率影響之趨勢;案例二將渦流產生器之長度、寬度及仰角皆列為預測參數;案例三以案例二之最佳化結果為初始設計,將各組渦流產生器之仰角列為參數,探討其各組參數改變對效率之影響,以上案例設計目標皆為取得熱交換器之最大效率。
由統計分析的結果顯示,經過最佳化設計後之熱交換器與無放置渦流產生器之熱交換器相比,其平均紐賽數增加了322%,最大效率達到1.34,因此達到本文之雙管型熱交換器之三角翼渦流產生器最佳化設計的目標。
英文摘要 A three-dimensional design problem is carried out to study the thermal-hydraulic characteristic of a heat exchanger with the delta winglet vortex generator. The objective of this thesis is to utilize the commercial package CFD-ACE+ and the Levenberg-Marquardt Method (LMM). Results show that the width of the delta- wing(w), height-pitch ratio (c/P) and the angle of attack (α) remains critical. Therefore, those parameters are chosen as our variables.
The thesis is aimed to improve the thermal performance of heat exchanger among the identical flow condition. Case A is optimized based on the original design while the width of the delta-wing and the angle of attack as design variables. Case B is optimized based on the original design while the width of the delta-wing, height-pitch ratio and the angle of attack are considered as design variables. Case C is optimized based on Case B while the angle of each vortex generators are considered as design variables.
The results of statistical analysis indicates that the optimized designs of the heat exchanger compare to the design without vortex generator, the average Nusselt number is higher by 322% and the thermal performance factor reach 1.34. As a result, the performance of heat exchanger is obviously improved.
論文目次 目錄
摘要 I
英文延伸摘要 II
致謝 VI
目錄 VII
表目錄 X
圖目錄 XI
符號說明 XIV
英文字母 XIV
希臘字母 XVI
第一章 緒論 1
1-1前言 1
1-2文獻回顧 2
1-3研究方法 6
第二章 數值分析 9
2-1 直接解問題 10
2-1-1 基本假設 12
2-1-2 統御方程式 12
2-1-3 紊流模式 14
2-2模型建立 16
2-2-1模型幾何尺寸 17
2-2-2 網格產生 17
2-2-3 邊界條件 19
第三章 拉凡格氏法於三角翼型渦流產生器最佳幾何外形預測 31
3-1 設計問題 31
3-2 拉凡格氏法極小化過程 37
3-3 數值計算流程 40
第四章 結果與討論 41
最佳化問題分析 41
4-1 Case A 42
4-2 Case B 43
4-3 Case C 44
4-4結果與討論 45
4-4-1 紐賽數比較 45
4-4-2 摩擦因子比較 46
4-4-3 效率比較 46
第五章 結論 65
參考文獻 67

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