流道幾何參數對質子交換膜燃料電池性能的影響

Effects of Gas Channel Geometry on the Performance in the PEM Fuel Cell

紀俊偉(Chun-Wei Chi)

指導教授 ： 林育才

元智大學/工程學院/機械工程學系/碩士(2004年)

摘要

本論文是以三維數值模擬的方法，分析不同的流道設計對質子交換膜燃料電池(Proton Exchange Membrane Fuel Cell)性能的影響。主要考慮的參數為流道的深度與寬度在不同的流道形式與流量下，對PEMFC所產生的影響。論文中也探討溫度對PEMFC的影響，隨著溫度的增加可提升整體的性能。流道深度的尺寸分別為1.0mm、1.5mm、2.0mm，而結果顯示對柵狀流道而言最佳化的深度是1.5mm；反之，深度對單蛇形流道則不會有很大的影響。陰極流量分別為25c.c./min、50c.c./min、75c.c./min、100c.c./min，結果顯示提高燃料流量對兩種流道都可增加其效率。流道寬度的影響則以改變流道/肋條之比值來探討，此值分別為1.2/2.0、1.6/1.6、2.0/1.2，結果顯示流道寬度的增加並不能有效改善整體的效能，反而會稍微降低其電流密度。

關鍵字

質子交換膜燃料電池 ； 流道設計 ； 數值模擬

並列摘要

The effects of geometry of flow channel, flow rate, and temperature in the Proton Exchange Membrane Fuel Cell (PEMFC) are analyzed with numerical simulations. The primary geometrical parameters considered are the channel depth and the channel width. Under different operating conditions, these effects in different flow channel types (parallel and serpentine) are investigated. Three channel depths are considered: 1.0, 1.5 and 2.0mm. The results show that the fuel cell with 1.5mm depth has better performance for parallel type fuel cell. However, the effect is not obvious for serpentine type fuel cell. It is also shown that the larger flow rate on the cathode, the better the performance of the cell for both types of channels. As for the channel width, three ratios of the channel/rib are studied: 1.2/2.0, 1.6/1.6, and 2.0/1.2. The results show that the increase of the channel width does not improve the fuel cell performance, and the corresponding current density decreases slightly.

並列關鍵字

Proton Exchange Membrane Fuel Cell (PEMFC) ； Type of flow channel ； Numerical simulation

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