| Summary: | 碩士 === 中原大學 === 機械工程研究所 === 100 === This article discusses and simulates the effect of various channel designs on the performance of proton exchange membrane fuel cells (PEMFCs) by using computational fluid dynamics software (CFD-RC). At first, consider a grid flow channel as the basic model. To analyze the phenomenon of mass transportation of internal flow field by changing the location of channel inlet (central inlet and side inlet) and the arrangement of baffles (removal of the inlet baffles and expanding flow paths). To study the variation of flow-field and performance on PEMFC by changing the operating conditions (the velocity, temperature, and pressure of cathode inlet).
The simulation results show that the mass transportation performance of sparse-side inlet channel is batter than noninletbaffle-central inlet channel, noninletbaffle-side inlet channel, and sparse-central inlet channel for stationary condition (velocity is 2.86m/s, temperature is 70˚C, and pressure is 2atm on cathode inlet.). Although the performance of sparse-side inlet channel is slightly worse than noninletbaffle-side inlet channel, the phenomenon in pressure drop of sparse-side inlet channel is batter than noninletbaffle-side inlet channel. The results also indicate that the performance increases when the velocity and the pressure of cathode inlet increase on PEMFC. The performance reduces when the temperature of cathode inlet increases on PEMFC.
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