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The flow channel structure at the cathode side is one of the main factors affecting the performance of proton exchange membrane fuel cells. The flow channel at the cathode side needs to discharge liquid water out of the fuel cell in time and make oxygen flow to the cathode catalytic layer as much as possible. Thus, the phenomenon of cathode flooding and concentration polarization is avoided. An innovative 3D cathode side channel, sugar gourd type channel, is designed. The sugar gourd type channel is formed by adding arc-shaped side trapezoidal block based on the traditional straight flow channel. The simulation results show that, compared with the traditional straight flow channel, the current density in the high current density region is increased by about 8%. And because of the special structure of the sugar gourd type channel, the air flow advances to the outlet in the form of pulse decline, and the heat and mass transfer are significantly enhanced. In addition, the influence of arc-shaped side trapezoidal height on overall performance is further explored.

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阴极侧流道结构是影响质子交换膜燃料电池性能的主要因素之一。阴极侧流道需要将液态水及时排出燃料电池和使氧气尽可能多地流向阴极催化层，从而避免阴极水淹和传质损失现象发生。设计了1种糖葫芦型三维阴极侧流道。糖葫芦型流道是在传统直流道的基础上，增加弧形边梯形块而形成的。对阴极侧糖葫芦型流道进行模拟，结果表明：与传统直流道相比，糖葫芦型三维阴极侧流道高电流密度区域电流密度提高了约8%；并且由于糖葫芦型流道的特殊结构，气流以脉冲递减的形式向出口推进，传热传质得到明显增强。另外，还进一步探究了弧边梯形高度对整体性能的影响。

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喻峰正（1997），男，硕士研究生，主要研究方向为质子交换膜燃料电池冷启动，2571157518@qq.com。

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喻峰正（1997），男，硕士研究生，主要研究方向为质子交换膜燃料电池冷启动，2571157518@qq.com。

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