本研究探討β型史特靈引擎在不同工作氣體的操作壓力與加熱溫度對輸出功率之影響，設計重點為低重量與小尺寸的微型史特靈引擎，並填充多種氣體對其性能進行實驗量測，研究不同工作氣體對於影響之原因，根據氣體之物理性質差異，即熱傳導係數、黏滯係數、比熱容等導致各輸出功率有所差別。再藉由減少引擎整體尺寸後進行加工組裝，實驗採取菱形驅動機構使移氣器與活塞呈現同軸運動，基於所提出的幾何尺寸大小，結合熱力學理論模型以分析預測史特靈引擎之性能與各腔室的熱力變化。實驗量測針對引擎之轉速、扭矩與輸出功率，研究結果指出，在相同填充壓力7 bar、加熱溫度750 °C情況下，引擎功率表現最突出是以氫氣為工作氣體其次為氦氣、氮氣和空氣，輸出最大軸功約33.5 W，轉速約1300 rpm相較於其他氣體增加約52 %、38 %、25 %。而理論模擬趨勢亦符合實驗量測結果，兩者皆顯示輸出功率將隨轉速增加到最佳運轉之速度後呈現下降的情勢，理論模擬與實驗量測之最大誤差約為15 %。

The purpose of this research is to investigate the gases measurement of the miniature Stirling engine with a rhombic mechanism, that is, the performance of four working gases under different pressures and heating temperatures is used to measure the generated mechanical power and compared the results with theoretical model to verify the accuracy of the model. The Stirling engine mainly composed of displacer, piston, heat exchangers and drive mechanism. This study adopts the theory of non-ideal adiabatic model to discuss the pressure loss and heat loss. From the results of the experiment obtained that at the same charge pressure of 7 bar and heating temperature of 750 °C, the most outstanding performance is hydrogen, followed by helium, nitrogen, and air. For helium, rotation speed of 1295 rpm, the maximum mechanical power is 33.5 W.

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