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研究生:呂學權
研究生(外文):Hsueh-Chwuan Lu
論文名稱:具內鰭片之旋轉流道與熱傳之研究
論文名稱(外文):Conjugate Heat Transfer of Mixed Convection in Rotating Channel with Internal Fins
指導教授:葉榮華葉榮華引用關係蔡順峰
指導教授(外文):Rong-Hua YehShun-Feng Tsai
學位類別:碩士
校院名稱:國立臺灣海洋大學
系所名稱:輪機工程系
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2008
畢業學年度:96
語文別:中文
論文頁數:177
中文關鍵詞:雷諾數鰭片科氏力
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本論文主要研究關於在燃氣渦輪機之冷卻葉片內通道之熱傳與流場分佈情形。旋轉雙通道與三通道的流場和熱傳,通道長寬比皆為2:1。研究之重點在於通道轉彎處、旋轉、雷諾數和加入鰭片時其熱傳效應與流場分佈情形。冷卻葉片從靜止到旋轉數Ro=224.72,雷諾數從10,000到20,000。為使結果更為精準,在網格的配置上,使用了六面體網格,分別針對單U通道與雙U通道外型,無鰭片和具鰭片之情況下,使其邊界所算出之數值更加精準。在此使用了Shear Stress Transport model(簡稱SST), SST模組融合了k-epsilon與k-omega模組之優點,使其邊界上和轉彎處所算出之數值,更接近實際實驗所觀察到之結果。
研究結果顯示,當無旋轉時,流體通過轉彎處時,流場會產生兩個對稱之渦流。加入旋轉之條件,可發現渦流結構被改變,靠近前緣處之渦流變大且往前緣方向靠近,靠近後緣處之渦流變小且往後緣處靠近。對於溫度場來看,轉彎處之溫度較低之液體往外側移動,第一流程中溫度較低之液體往後緣移動。第二流程中溫度較低之液體往前緣移動。因為科氏力作用之方向不同,第一流程中流體為徑向外流,而第二流程為徑向內流。當轉速越高,流體擾動越大,使得熱傳效應變高。雷諾數從10,000增加到20,000時,通道內之熱傳係數降低,而總熱傳量增加。鰭片設置為垂直與流體流動方向,此設置本身會破壞因科氏力所產生之渦流現象,但會引起較大的流體擾動,所以散熱效果最好。
中文摘要
英文摘要
圖目錄
符號說明
1 緒論
1.1 前言
1.2 研究動機與目的
1.3 研究目的與方法
1.4 文獻回顧
1.5 論文內容與架構
2 物理與數學模型
2.1 統御方程式
2.2 紊流模型
2.3 邊界條件
2.4 流道幾何設計
3 數值模型
3.1 有限體積法(Finite Volume Method)
3.2 網格系統 (Geid System)
3.3 高階上風離散法
3.4 SIMPLER演算法
4 結果討論
4.1 外型的選擇
4.2 各種外型之流場、溫度場分析
4.3 流場結構比較分析
4.4 溫度場比較分析
4.5 熱傳效率比較分析
5 結果與未來工作
5.1 結論
5.2 未來展望
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