建議

本研究延續廖的研究，並且針對浮力效應對流場的影響，做活塞擺置角度的相關研 究，所獲得的結果不但對於一些隨活塞作往復運動之動態熱流相關方面問題的運動機制 有一初步的瞭解，另外對於更有應用價值在浮力效應的影響下，活塞擺置角度的的相關 熱流機制。但過程中仍有部分簡化值得在未來加入探討，而有以下數點建議繼續研究：

1. 本論文僅提供數值模擬計算的分析結果，雖然有多組數據能說明其流場與溫度場分 佈現象，但若搭配實驗方式探討動態移動邊界問題，並與數值結果比較，將能更清 楚其運動機制，並有助於找尋更有效率的改善方法。

2. 對於大部分工程問題來說，所遇到之流場大多為紊流、可壓縮流場，而引擎內活塞 的往復運動便屬於其中一例。在本研究中，假設活塞內部冷卻流體之雷諾數都是層 流、不可壓縮流場，對於活塞高速往復運動，內部冷卻流體之雷諾數動輒 3、4000 或者更高，相關的壓力變化對流體密度的影響不容忽略，與真實的狀況確實有一段 差距。因此，應發展紊流及可壓縮流之計算程式，以便能以數值計算來模擬實際之 物理現象。

3. 以實際的活塞內部冷卻系統來說，渠道內之流場與溫度場都是三維方向的分佈與變 化，尤其在動態之移動邊界情況下，流場的分佈以及溫度場的變化機制都相當複 雜，應建立三維的有限元素法計算程式，發展一套適合的演算法。

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