| Summary: | 碩士 === 中原大學 === 機械工程研究所 === 99 === 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.
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