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研究生:林志澤
研究生(外文):Lin Chin Che
論文名稱:內設縱鳍往復彎管流熱傳研究
論文名稱(外文):Heat Transfer of Reciprocating Curved Tube Fitted With Longitudinal Fins
指導教授:張始偉張始偉引用關係
指導教授(外文):Chang, Shyy-Woei
學位類別:碩士
校院名稱:國立高雄海洋科技大學
系所名稱:輪機工程研究所
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:2006
畢業學年度:94
語文別:中文
論文頁數:83
中文關鍵詞:內設縱鳍彎管往復彎管熱傳活塞冷卻
外文關鍵詞:Longitudinal FinReciprocating Curved TubePiston Cooling
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本實驗研究探討往復內設縱鳍彎管熱傳現象,評估應用縱鳍於往復彎管活塞冷卻性能強化之效果。實驗檢測內設縱鳍彎管各五組流向截面(φ=0°、45°、90°、135°、180°)於0、0.83、1.25、1.67及2Hz等五個往復頻率之周向熱傳係數分佈,比較往復與靜止狀態的熱傳結果,探討往復運動對內設縱鳍彎管熱傳性能造成的影響。於實驗參數範圍內,往復彎管熱傳係數與靜態彎管熱傳係數之比值為0.67~1.12。於任一往復頻率,測試五組雷諾數(Re=5000、10000、15000、20000、24000)。為評估往復浮力對熱傳產生之影響,任一組測試Re數與往復頻率均採用五組熱通量,藉以改善浮力強度,分析往復浮力效應對內設縱鳍彎管熱傳之影響。參數分析之焦點探討熱傳係數因受彎管內離心力、流場慣性力、往復力及往復浮力之個別與偶合效應所產生的變化,並推導出符合物理意義之熱傳實驗公式,提供設計活塞冷卻系統之參考。
This experimental study examines the heat transfer of the reciprocating curved tube fitted with longitudinal fins with the attempts to evaluate the heat transfer augmentation generated by the longitudinal fins and to develop the heat transfer correlation for the design of piston cooling system. The circumferential heat transfer distributions along five cross-sections of the curved fin-tube were measured. Heat transfer tests were performed with five reciprocating frequencies of 0, 0.83, 1.25, 1.67 and 2 Hz for each tested Reynolds number of 5000, 10000, 15000, 20000, 24000. The selected heat-transfer results in this thesis illustrated the heat transfer physics inside the reciprocating curved tube fitted with longitudinal fins. The Nusselt numbers obtained from the reciprocating and static test-conditions were compared to unravel the influences of reciprocation on heat transfer. Within the parametric range studied, the ratios of Nusselt number between the reciprocating and static tubes were in the range of 0.67~1.12. A set of heat transfer correlations was derived to permit the evaluation of individual and interactive impacts of centrifugal force, inertial force, reciprocating force and reciprocating buoyancy on heat transfer, which provided the design reference for piston cooling system.
謝誌…………………………………………….…………………….…I
中文摘要…..……………………………………..…………………….II
英文摘要…..………………………………………..……………...….III
表目錄…..………………………………………..……………...……..V
圖目錄…..…………………………………………..……….....……..VI
符號說明.……………………………………………..…….....……..VII

第一章 前言…………………………………………….....….....……..1
1-1 船舶主機發展概述………………………….…..…….……..1
1-2 活塞冷卻系統…………………………………..….….……..4
1-3 研究目標………………………………………..……………7

第二章 文獻回顧…………………………………………..…………10
2-1 彎管、螺旋管與內設流向鰭片直管流熱傳研究………….10
2-2 往復流與脈動流熱傳研究……………………..…………..16
2-3 理論分析…………………………………………..………..24

第三章 實驗設備與方法………………………………..……………34
3-1 往復機組…………………………….…………...…………34
3-2 熱傳測試模組………………………………...…………….38
3-3 數據處理及實驗檢測之參數範圍……………...………….40
3-4 實驗步驟………………………………………..………….47
3-4-1 熱損失實驗步驟………………………..…..……….47
3-4-2 靜態實驗步驟……………………………..………...48
3-4-3 往復實驗步驟…………………………………..…...49
3-5 實驗數據誤差分析…………………………………..……...49
第四章 結果與討論……………………………………..…………..51
4-1 靜態熱傳結果……………………………..………………..51
4-2 往復熱傳結果…………………………..…………………..64
4-3 參數分析………………………………..…………………..68
第五章 結論…………………………..……………………………..79
參考文獻…………………………………………………………..…..81
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