本研究目的為進行α型史特靈引擎內部熱流場之數值模擬分析。本研究建構完成三維可動邊界問題之電腦模擬模組，求解氣缸內之熱流場分佈，探討α型史特靈引擎之填充壓力、加熱端溫度、相位角、運轉速度、再生通道等參數對其輸出性能之影響。研究發現填充壓力越高，史特靈引擎輸出功率越大。另外，史特靈循環之熱效率與輸入熱量隨加熱端溫度提高而增加，若有良好的加熱設計，可在低加熱端溫度下仍可得高功率輸出。亦求解出在不同的轉速下的引擎輸出功率，並與實驗量測比較數據相符。接著進行相位角之探討，因最佳相位角會隨操作參數與幾何改變而不同，因此本研究探討當填充高壓、引擎汽缸直徑、加熱溫度與體積比改變時，對其最佳相位角之選擇與引擎性能之影響。
最後並將熱流場之數值模擬分析結果與現有熱力循環理論模式比較，以探討熱力循環理論模式之正確性。

The thermofluidic module based on the frame of a computational fluid dynamics package is constructed for three-dimensional and transient numerical simulation of the thermofluid field inside an α-type Stirling engine. A parametric study of the effects of gas pressure, heating temperature, and rotation speed on the performance of an α-type Stirling engine is carried out. It is found that the output power of the Stirling engine increases with these parameters. Meanwhile, the numerical simulation of the engine power output as a function of the rotational speed is completed, and a close agreement between the numerical predictions and the experiments has been observed. The optimal phase angle for the developed α-type Stirling engine is also obtained. However, the optimal phase angle and engine performance are dependent on charged pressure, cylinder diameter, heating temperature, and volume ratio. In addition, a comparision between the present thermofluidic module and existing thermodynamic model is attempted to verify the feasibility of the latter.

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