本研究係針對四汽缸雙動式史特靈引擎(Four-cylinder double-acting Stirling engine)內部之熱流場進行數值模擬與參數分析；藉由三維可移動邊界熱流模型，求解引擎內部工作流體之熱流場分佈情況，並探討引擎轉速、填充質量、加熱溫度與孔隙率對引擎性能之影響，進一步求得引擎之最佳設計。首先，利用CAD軟體CATIA建立引擎內部工作流體之流場模型，再透過ANSYS Workbench之網格模組建置網格系統，最後選用ANSYS Fluent軟體之Realizable k-ε紊流模型進行數值模擬計算。
根據模擬結果可知引擎會在特定轉速下達到最大輸出功率；而對於在不同操作條件之引擎而言，可得到引擎具有最大輸出功率之轉速亦不同。另外，增加汽缸內部填充質量或提高加熱端溫度皆可提升引擎之輸出功率、扭矩與熱效率。此外，再生通道之孔隙率亦是本研究探討參數之一；透過模擬結果可知特定孔隙率可使引擎具有最大輸出功率、扭矩與最佳熱效率。

This research is focused on numerical simulation of thermal and flow fields in a four-cylinder double-acting Stirling engine, with a three-dimensional moving boundary model. The research is aimed to study internal thermal and flow fields of the engine as well as to carry out parametric analysis of varying rotational speed, charging mass, heating temperature and porosity in order to determine best design of the engine. First of all, the engine’s working fluid model is created using the CAD software, CATIA, followed by model meshing using the mesh module in ANSYS Workbench. The numerical simulation is then conducted in ANSYS Fluent using the turbulence (Realizable k-ε) model.
Based on the simulation results, the maximum power output of the specified engine rotational speed can be obtained. Under different operating conditions, the maximum power output corresponding to the engine rotational speed can be found. Besides that, increasing charging mass in engine’s cylinder or increasing the heating temperature can improve the engine’s performance, including its power output, torque and thermal efficiency. In addition, the porosity in regenerator is also taken into account for parametric analysis. Thus, the porosity corresponding to the best performance is known.

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