臺灣博碩士論文加值系統

由於船舶引擎單位重量馬力輸出持續提高，引擎活塞熱負載（含熱應力及活塞材料溫度）亦逐漸增高，因此必須配合此發展趨勢，提昇活塞之冷卻系統效能，以確保引擎運轉時活塞構件之可靠性。本研究針對活塞裙內設之冷卻螺旋通道及活塞冠下方設置衝擊噴柱陣列，探討此類流場應用在活塞冷卻時之熱傳性能。研究焦點分析螺旋管內因離心力引生之渦流（Dean flows），由於隨活塞往復運動，其熱傳性能自非往復流場改變之情形。另一主題探討非往復及往復狀態之衝擊噴柱陣列熱傳特性。研究內容係以實驗方法，檢測平滑螺旋管及衝擊噴柱陣列於0、0.83、1.25、1.67和2Hz等五個往復頻率之熱傳係數分佈。並比較往復與非往復狀態之熱傳結果，探討往復運動對平滑螺旋管流與衝擊噴柱陣列熱傳性能所造成之影響。熱傳現象之參數分析，探討熱傳係數因受流場慣性力、往復力及浮力之個別與偶合效應作用所產生之變化；推導熱傳實驗公式，提供相關業者參考使用。
關鍵詞：往復螺旋管流， 往復衝擊噴柱陣列， 活塞冷卻

As a result of ever-mounting power-to-weight ratio of a marine diesel engine, the thermal loads of a piston （involving the thermal stress and material temperatures）increased accordingly. To cope with this particular developing trend, heat transfer augmentation for the internal cooling system of piston is essential in order to assure the reliability of piston. This research program examined the heat transfer performances of a spiral cooling passage and an impingement jets array with piston cooling application. The research focused on the influences of reciprocation on the heat transfers in the spiral passage and impingement jets-array. This research implemented an experimental approach that measured the local heat transfer distributions along the spiral flow passage and over the impingement surface at reciprocating frequencies of 0, 0.83, 1.25, 1.67 and 2Hz. The heat transfer results attained from the static and reciprocating tests were compared to unravel the impact of reciprocation on the heat transfer performance. The parametric relationships between the convective heat transfer and inertial, reciprocating and buoyancy forces were subsequently performed with the aim of deriving the designer friendly heat transfer correlations for piston cooling system.
Keywords： Reciprocating Spiral Tube,
Reciprocating Impinging Jets-Array, Piston Cooling.

目 錄
致謝…………………………………………………………………………I
中文摘要……………………………………………………………………II
英文摘要……………………………………………………………………III表目錄………………………………………………………………………IV
圖目錄………………………………………………………………………V
符號說明……………………………………………………………………VIII
第一章 前言………………………………………………………………1
1-1 船舶推進柴油引擎發展趨勢……………………………………1
1-2 活塞冷卻系統熱傳強化…………………………………………9
1-3 研究目標…………………………………………………………12
第二章 文獻回顧與研究策略……………………………………………13
2-1 彎管（螺旋管）流熱傳研究……………………………………13
2-2 噴柱衝擊（陣列）流熱傳研究…………………………………15
2-3 脈動流與往復流熱傳研究………………………………………18
2-4 研究策略…………………………………………………………24
2-4-1 往復流理論分析………………………………………………24
2-4-2 研究規劃 ……………………………………………………32
第三章 實驗設備與方法…………………………………………………34
3-1 往復實驗機組……………………………………………………34
3-2 熱傳實驗模組……………………………………………………36
3-2-1 螺旋管熱傳實驗模組…………………………………………36
3-2-2 衝擊噴柱陣列熱傳實驗模組…………………………………38
3-3 實驗步驟…………………………………………………………40
3-3-1 往復螺旋管流實驗……………………………………………41
3-3-2 往復衝擊噴柱陣列實驗………………………………………42
3-3-3 熱損失實驗 …………………………………………………43
3-4 數據處理…………………………………………………………44
3-5 參數範圍…………………………………………………………47
第四章 往復螺旋管流熱傳………………………………………………50
4-1 靜態螺旋管流熱傳………………………………………………50
4-2 往復螺旋管流熱傳………………………………………………54
4-3 參數分析…………………………………………………………58
第五章 噴柱陣列衝擊面熱傳……………………………………………67
5-1 靜止狀態噴柱陣列………………………………………………67
5-2 往復狀態噴柱陣列………………………………………………73
5-3參數分析 …………………………………………………………75
第六章 結論………………………………………………………………89
6-1 往復螺旋管流熱傳………………………………………………89
6-2 噴柱陣列衝擊面熱傳……………………………………………90
參考文獻 …………………………………………………………………92
個人著作目錄 ……………………………………………………………95

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