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系統識別號 U0026-3007201200210200
論文名稱(中文) 自由活塞式史特靈引擎之理論模擬與最佳化分析
論文名稱(英文) Theoretical Simulation and Optimization of a Free-Piston Stirling Engine
校院名稱 成功大學
系所名稱(中) 航空太空工程學系碩博士班
系所名稱(英) Department of Aeronautics & Astronautics
學年度 100
學期 2
出版年 101
研究生(中文) 莊靜雯
研究生(英文) Chin-Wen Chuang
學號 p46994088
學位類別 碩士
語文別 中文
論文頁數 79頁
口試委員 口試委員-宋齊有
口試委員-康尚文
口試委員-王覺寬
指導教授-鄭金祥
中文關鍵字 自由活塞式  史特靈引擎  理論模式  最佳化設計 
英文關鍵字 Free piston  Stirling engine  Theoretical model  Optimization 
學科別分類
中文摘要 本研究以改善自由活塞式史特靈引擎(Free-Piston Stirling Engine, FPS)效益為目的,透過發展理論模式並結合簡易型共軛梯度法(Simplified Conjugate Gradient Method, SCGM),進行最佳化分析。其中,理論模式包括分成熱力模式與動力模式兩大部分。在熱力模式中,以不可逆熱力模式,求得自由活塞式史特靈引擎內部各腔室的溫度、體積、壓力與質量的暫態變化;動力模式則是由膨脹室與壓縮室間的壓力差,並考慮彈簧的性質與外部負載,推算出活塞與移氣器的加速度、速度與位移變化。另外,亦利用最佳化設計方法,針對彈簧常數、再生通道間隙、活塞與移氣器質量等影響因子進行多參數的最佳化(Muti-variable optimization),改善自由活塞式史特靈引擎的性能。結果顯示,隨著彈簧常數的增加,可改善移氣器與活塞的碰撞問題。在不同的參數組合設計下,再生通道間隙與質量具有最佳的範圍能夠讓引擎趨於穩定振盪。當最佳化搜尋目標非常接近時,可藉由改變步進距與敏感度係數加速收斂,求得更精確的最佳值。此外,本研究發現,利用最佳化分析可以有效改善碰撞問題並提升引擎功率,對自由活塞式史特靈引擎的設計有重要助益。
英文摘要 In order to improve the performance of free-piston Stirling, a simulation with a theoretical model combined with the optimized analysis by simplified conjugate gradient method has been performed in this study. This theoretical model is composed of thermal model and dynamic model. In irreversible thermal model, using momentum equations as the government equations to calculate the transient influence of temperature, volume, pressure and mass in each chamber inside the Stirling engine, and then considering the property of spring and loading, the acceleration, velocity and displacement can get from the pressure difference between expansion chamber and compression chamber in the dynamic model. The optimized analysis is considerated with the stiffness coefficient, the gap of regenerator access and the mass of displacer or piston. According to these influential factors, we can use the simplified conjugate gradient method as the optimized method to improve the performance of free-piston Stirling.
論文目次 摘要 I
ABSTRACT II
誌謝 III
目錄 V
表目錄 VIII
圖目錄 IX
符號索引 XII
第一章 前言 1
1.1 研究動機與目標 1
1.2 史特靈引擎 2
1.3 自由活塞式史特靈引擎 3
1.4 最佳化分析 5
第二章 理論模式 7
2.1 機構模型 7
2.2 基本假設 7
2.3 熱力模式 9
2.3.1 再生通道 9
2.3.2 膨脹室 12
2.3.3 壓縮室 14
2.4 動力模式 15
2.4.1 初始參數設定 15
2.4.2 運動方程式 17
2.4.3 移氣器與活塞之位移與速度 19
2.4.4 碰撞處理 21
2.5 熱力與動力模式的整合 23
第三章 參數分析 25
3.1 參數選定 25
3.2 彈簧常數的影響 25
3.3 再生通道間隙的影響 26
3.4 質量的影響 27
3.5 綜合討論 28
第四章 最佳化設計 30
4.1 自行發展計算程式及界面 30
4.2 最佳化方法 30
4.3 簡易型共軛梯度法(SCGM) 32
4.4 程式設計流程 34
第五章 最佳化結果與討論 36
第六章 結論 39
參考文獻 41
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