Date of Award
Mechanical, Automotive, and Materials Engineering
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In this study, the steady state performance and dynamic behavior of a commercial 10-cell PEM fuel cell stack was experimentally investigated using a self-designed and developed PEM Fuel Cell Testing Stand. The start-up characteristics of the stack to different current load and dynamic responses after current step-up were studied. The stack voltage was observed to experience oscillation at air excess coefficient of 2 owing to the flooding and recovery of part of cells. To correlate the stack voltage with the pressure drop across the cathode/anode, fast Fourier transform was performed to obtain the dominant frequency of pressure drop signal, which indicated the water behavior in cathode/anode thereby predicting the stack voltage change. It is potentially possible to utilize pressure drop signal as a diagnosis tool for stack voltage at a fixed current load.
Chen, Jixin, "Experimental study on the performance of a 10-cell proton exchange membrane (PEM) fuel cell stack" (2007). Electronic Theses and Dissertations. 4652.