Optimization of the cathode flow channel structure can enhance the performance of the proton exchange membrane fuel cell(PEMFC).A design of machining through holes on a cube to make a block with a grille-like cross-section is proposed.A three-dimensional(3D)model of the cathode flow channel of PEMFC is established to study the influence on the performance of PEMFC.Under the premise of keeping the opening rate constant at 0.36,the more the number of openings,the better the performance of PEMFC.When the number of openings is 25(GB-25),the power of density of the PEMFC can be increased by 17.0%compared with that without grille blocks(GB-0).The influence of the arrangement of multiple grille blocks in the cathode channel on the performance of PEMFC is studied.It is found that when multiple grille blocks,that the number of openings is 16,are equally placed at the back end of the cathode channel(GB-16-3BE),PEMFC has the best performance,the power density is increased by 19.8%compared with that of GB-0.
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