流道入口及檔板排列方式與操作參數對燃料電池性能之影響

Effect of Channel Inlet and Baffle Arrangements and Operating Conditions on the Performance of Fuel Cells

陳柏任(Bo-Ren Chen)

指導教授 ： 蔡瑞益

中原大學/工學院/機械工程研究所/碩士(2011年)

https://doi.org/10.6840/cycu201100667

摘要

本文研究不同的流道設計對質子交換膜燃料電池性能的影響，並利用CFD-RC計算流體力學套裝軟體輔以模擬來驗證。首先以棋盤型流道做為基礎模型，改變流道入口的位置及流道檔板排列來分析內部質傳現象;再藉以改變操作參數(陰極入口流速、溫度、壓力)所得之結果來進行分析電池內部現象的變化及性能影響。
模擬結果顯示，在陰極入口流速為2.86m/s，壓力為2atm，溫度為70℃時，交錯-邊界入口的流道和同軸-中央入口、同軸-邊界入口、交錯-中央入口等三種流道相較之下，其內部質傳現象較良好，因此性能也較佳。當陰極入口流速為1.43m/s時，電流密度小，性能較差，而隨著入口流速由2.86m/s至5.72m/s逐漸提高，電流密度也增大，性能較佳;同時改變壓力為1atm、1.5atm、2.5atm及溫度為65℃、80℃，影響了氧濃度及相對濕度的變化，在65℃/2.5atm時有著最大的電流密度。

關鍵字

檔板 ； 操作參數 ； 質子交換膜燃料電池 ； 流道入口

並列摘要

The purpose of this thesis is to study using the various designs of flow channels for analysis, and to know the effect on performance of proton exchanges membrane fuel cell by using the Computational fluid dynamic software CFD-RC to simulate. At first, choose the grid flow channel as the basic model. Analyze the phenomenon of internal mass transfer by changing the location of channel inlet and baffle arrangement. Then, change the operating condition such as velocity, temperature, and pressure of cathode inlet to analyzing the effect on performance and internal phenomenon of cell.
The simulation results indicate that the performance and internal mass transfer of staggered-side inlet flow channel is better than in-line-central inlet, in-line-side inlet, and staggered-central inlet flow channel when velocity is 2.86m/s, pressure is 2atm and temperature is 70℃ on cathode inlet. The current density is small and performance is bad when velocity is 1.43m/s. With increasing inlet velocity from 2.86m/s to 5.72m/s, the current density is also rising and performance is more better. When we changed the pressure as 1atm, 1.5atm and 2.5atm and temperature is 65℃ and 80℃ at the inlet, the oxygen concentration and relative humidity could be affected. At 65℃/2.5atm the cell have maximum current density.

並列關鍵字

PEM Fuel Cell ； Flow Channel Inlet ； Baffle ； Operating Condition

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