臺灣博碩士論文加值系統

汽車水箱是汽車引擎冷卻系統中最重要的機件，對引擎的動力性、經濟性、可靠性都有重大影響， 而如何提升水箱的散熱能力，且製作出性能更好、體積更小、材料更省、讓系統運轉更節能的水箱， 一直是汽車產業中努力的一環。

本研究針對車用水箱水管進行內置三角翼型渦流產生器，考量水箱的水管內置三角翼型渦流產生器後與原設計(無內置)在穩態下熱傳性能增益，藉由數值計算與實驗量測進行研究結果探討。藉商用軟體COMSOL Multiphysics建立三角翼型渦流產生器之三維模型，將三角翼型之寬度、角度、間距列為測試參數，在管內採固定流速及入口水溫及管外固定進風速度。首先，就單管內置三角翼型渦流產生器作為測試件，完成最佳化的數值計算，並藉實驗求取熱能與摩擦因子(friction factor)之數據，比對數值計算結果，獲得單一水管內置三角翼型渦流產生器後與原設計於穩態下熱傳效益。透過最佳化的數值結果，最佳化設計後之水管與無放置渦流產生器之水管相比，其平均紐賽數增加了215%，熱性能係數增加13.9%，因此達到本文之車用水箱水管內置三角翼渦流產生器最佳化設計的目標。

Radiator is the key component in the cooling system of the engine for a car. It has the major impact on the power, efficiency and reliability for the engine. How to enhance the thermo-hydraulic performance of radiators with more compact design is a goal in the car industry! All of radiator manufactures try to achieve the goal through different ways diligently.

The project is to insert a delta-wing vortex generator in the tube for automobile radiators. Comparing data from the one with delta-wing vortex generator inserted and the one without insertion to see how it affect heat transfer performance. We can use the commercial software,COMSOL Multiphysics and create a 3D model of delta-wing vortex generator with width,pitch and the angle of the delta-wing as variables and test under steady flow. And record the temperature of water input the tube and the velocity of outside air from the tube under a constant velocity of the tube water. First, the performance of a single tube with a delta-wing vortex generator is analyzed to establish the best combination of characteristic parameters to obtain the highest thermal enhancement factor. Afterward, it will perform experimental tests to investigate heat transfer performance expressed in terms of thermal energy and fluid-flow performance expressed in terms of friction f factor for the one with delta-wing vortex generator inserted and the one without insertion under varied inlet water temperature and upstream air velocity. The results of statistical analysis indicates that the optimized designs of tube compare to the design without vortex generator, the average Nusselt number is higher by 196% and the thermal performance factor is higher by 15%. As a result, the performance of automobile radiators With Build-in Delta-wing Vortex-generator Tubes is obviously improved.

摘要
Abstract
致謝
目錄
表目錄
圖目錄
符號說明
第一章　緒論
1-1研究背景與動機
1-2文獻回顧
1-2-1車用水箱發展
1-2-2渦流產生器
1-3研究目的
第二章　理論模式
2-1熱傳介面
2-1-1熱傳介面之邊界條件
2-2紊流介面
2-2-1紊流介面之邊界條件
2-3熱流理論
2-4最佳化概述
2-5最佳化設計流程
2-5-1建立最佳化設計模型
2-5-2選定最佳化求解器
2-5-3分析最佳化結果
第三章　數值方法
3-1選擇模組/PDE
3-2建構幾何模型
3-3材料參數設定
3-4邊界條件設定
3-4-1熱傳介面
3-4-2紊流介面
3-5網格建立與測試
3-6求解設定
3-7數據後處理
第四章　實驗設備及方法
4-1實驗設備
4-2測試件介紹
4-3實驗方法與步驟
第五章　結果與討論
5-1數值模擬計算 48
5-1-1相同雷諾數下有無三角翼型渦流產生器之數值模擬結果
5-1-2相同雷諾數下最佳化後不同間距比之數值模擬結果
5-2實驗結果
5-3數值模擬與實驗數據比較
第六章　結論與未來展望
6-1結論
6-2未來展望
參考文獻

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