本研究採準穩態模型利用有限元素法進行熱流分析，求解穩態引擎缸頭與缸體熱傳導之溫度場，在不均勻熱傳係數下分析不同熱源造成的溫度分佈差異。透過光陽公司提供的資料作為設定條件，評估引擎操作溫度與分佈均勻性。
在本文中分為兩組汽缸內熱通量邊界條件來分析缸蓋及汽缸不同截面溫度場與缸內壁和鳍片尖端溫度，並探討熱源均勻分佈之效應，最後將本研究中建立模型之數值解和實驗量測值進行比對。
結果顯示，熱源分佈的改變對於缸內壁及鳍片尖端溫度隨角度變化趨勢並沒有顯著影響，溫度場梯度分佈由氣冷空氣邊界熱傳係數所主導。引擎轉速八千五百轉下，模擬值與實驗值誤差介於10%內，最準確點誤差0.4%，誤差最大為9.9%。而均勻分佈之熱通量模擬結果有著較大的誤差，誤差值介於4%~17%。

The paper deals thermal analysis of cylinder head and cylinder with quasi steady model in the condition of different heat transfer coefficient and heat flux distribution. The numerical simulation in this study makes use of the finite element method to solve temperature field of heat conduction. Through the cylinder heat flux distribution data provided by the manufacturer (Kymco Company) and hence estimated the engine operating temperatures and distribution homogeneity. In the research used two cases of cylinder heat flux distribution for boundary conditions to analyze engine different section, cylinder wall, and fin tip temperatures, also discussed uniform heat flux distribution effect. Finally, the numerical values were compared with experimental measurements.

The results reveal that the change of heat flux distribution influences little about the tendency of temperature changing as the angle of cylinder wall and fin tip, the cooling air heat transfer coefficient governs the temperature distribution. On the condition of engine speed 8500 rpm, the simulation results agree experimental values with an error under 10%, the most accurate point is 0.4%, and the most inaccurate is 9.9%. The uniform heat flux results in a larger error which between 4%~17%.

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