臺灣博碩士論文加值系統

燃料電池具低污染、高效率等特性，為未來最具潛力的替代能源之一，而提昇其功率密度也是目前極欲突破的目標。質子交換膜燃料電池擁有低溫運作、快速啟動、高功率密度、壽命長、固態非腐蝕性電解質、設計簡單及應用範圍廣等多項優點，適合應用於車輛系統及3C家電用產品的動力來源裝置，故本論文將針對質子交換膜燃料電池來進行研究。
在質子交換膜燃料電池中流道的設計為一重要問題，即如何藉由流道入出口流量管制的設計使得在每一條流道中的反應氣體流量為相同，達到在每一流道中反應氣體濃度能均勻分配的目的。本研究擬藉由針對多流道進口處的幾何形狀設計，進行流場之數值模擬，藉由計算流體力學數值模擬的結果，來評估各式流道口的設計對其電化學性能影響，以期獲得最佳燃料管理之流道入出口設計。
關鍵詞：質子交換膜燃料電池、流道入出口設計、計算流體力學

Fuel cells are used for power generation with low emission and high efficiency. Fuel cell will become one of the potential alternative energy sources in the future, and currently, the most emergent issue is to raise the cell power density. The major advantages of Proton Exchange Membrane Fuel Cell (PEMFC) are: low-temperature operation, quick starting, high energy density, long-life operation, solid non-corrosive electrolyte, and simple design. Therefore, the wide applications of PEMFC can be found in many industries and transportations, such as the power source of hybrid vehicles and 3C household appliances. Then, in this study, the PEMFC is the target of study.
One of the important problems in the design of multiple fuel channels for PEMFC is, how to make the reaction rate of fuel gas in every channel to be as uniform as possible. This problem cannot be found in the single-channel design of PEMFC. By the appropriate geometry design at the entrance and outlet of every channel, the fuel can be controlled to equally flow into each channel. Then the reaction rate between the fuel gas and diffusion layer in each channel will be the same and the dead zone would not be happened in some channel. In this study, the numerical simulations of flow fields will be carried out to assess the influence of entrance and outlet geometry design on the electrochemistry performance of cell. It is hoped that, with the simulation result, the optimal geometry design of each channel entrance can be proposed.
Keywords：Proton Exchange Membrane Fuel Cell( PEMFC), Entrance-Outlet Design, CFD

目錄
中文摘要 ……………………………………………………………………i
英文摘要 ……………………………………………………………………ii
致謝 …………………………………………………………………………iii
目錄 …………………………………………………………………………v
表目錄 ………………………………………………………………………viii
圖目錄 ………………………………………………………………………ix
符號說明 ……………………………………………………………………xi
第一章、導 論…………………………………………………………1
1-1 前言……………………………………………………………1
1-2文獻回顧 ………………………………………………………4
1-3研究動機與目的 ………………………………………………9
1-4 本文架構 ……………………………………………………11
第二章、理論基礎與設計概念………………………………………12
2-1 PEMFC的簡介…………………………………………………12
2-2 PEMFC的性能曲線……………………………………………14
2-3基本假設………………………………………………………16
2-4統御方程式……………………………………………………17
2-5入口邊界條件…………………………………………………18
2-6幾何形狀與尺寸………………………………………………19
2-7無因次分析……………………………………………………20
2-8均勻化指標……………………………………………………21
第三章、數值方法……………………………………………………23
3-1 數值方法 ……………………………………………………23
3-1-1 有限體積法 ………………………………………………23
3-1-2 對流項處理 ………………………………………………25
3-1-3 擴散項處理 ………………………………………………27
3-1-4 有限差分方程 ……………………………………………28
3-1-5 壓力梯度項處理 …………………………………………29
3-1-6 SIMPLEC數值方法…………………………………………30
3-2 邊界條件 ……………………………………………………31
3-3 收斂標準 ……………………………………………………32
第四章、結果與討論…………………………………………………33
4-1平均流速之探討………………………………………………34
4-1-1原始形狀……………………………………………………34
4-1-2入口處加入緩衝區…………………………………………35
4-1-3左右緩衝區各分三區塊……………………………………35
4-1-4將Case 3去掉各區塊中間連接入口與緩衝區的流道……36
4-1-5左右緩衝區之各區塊均獨立………………………………36
4-1-6入出口均有緩衝區…………………………………………37
4-1-7連接入口處與緩衝區的流道傾斜…………………………37
4-1-8入口流道中間有彎曲………………………………………38
4-1-9調整Case 7…………………………………………………38
4-1-10調整Case 8 ………………………………………………39
4-2不同入口流速之探討…………………………………………40
第五章、結論與未來展望……………………………………………41
5-1 結 論…………………………………………………………41
5-2 未來展望 ……………………………………………………42
參考文獻……………………………………………………………………45
自述…………………………………………………………………………72

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