中文摘要：

开展了不同重力情况下燃料电池性能的实验研究。利用微重力落塔，对常重力和微重力条件下燃料电池发电时其内部的两相流动开展了可视化现场观测。对重力因素对燃料电池内部传质过程的影响进行了分析和讨论。实验结果表明：当电流密度较大时，在微重力环境中燃料电池性能较常重力环境中的有较明显下降。由于微重力条件下浮升力的消失导致气体不能及时从流道中排出，进而对直接甲醇燃料电池内的传质过程产生负面影响。

英文摘要：

An experimental investigation of fuel cells performance under different gravity conditions has been conducted. An in situ visual observation of two-phase flow inside fuel cells in normal gravity and microgravity has been performed, respectively, in a drop tower. The effect of gravity on mass transfer in fuel cells was analyzed and discussed. The experimental results indicated that when the fuel cells operate at high current density, its performance in microgravity is worse than it in normal gravity condition. Carbon dioxide bubbles can not discharge in time from the flow channels because of disappearance of buoyancy lift in microgravity condition. It results in a negative influence on the mass transfer in direct methanol fuel cells.