To improve the drag reduction performances of the proton exchange membrane fuel cell (PEMFC), a three dimensional numerical investigation about the water removal in a lotus-like PEMFC flow channel is carried out. The effects of the microstructure shape parameters (height, radius and spacing) are investigated. The investigation revealed that the liquid water can be effectively removed by the lotus-like flow channel from the channel wall surface. The appropriate height of lotus-like channel can effectively reduce the water coverage ratio on the top wall of the lotus-like flow channel. As height increases, the average drag reduction ratio increases firstly and decreases finally. When the radiuses are 25 μm and 50 μm, the average drag reduction ratios of these cases are higher than those of the other cases obviously. The spacing of the lotus-like channel has a few effects on the water removal and water coverage ratio. The lotus-like flow channel with the height of 50 μm, the radius of 50 μm and the spacing of 150 μm has a high drag reduction and anti-corrosion performance. The work in this study provides a new choice for the flow channel and has certain guiding significance for the design of the flow channel for anti-corrosion and drag reduction.

为了提高质子交换膜燃料电池（PEMFC）的减阻性能，进行了荷叶状PEMFC流道中除水的三维数值研究。研究了微结构形状参数（高度、半径和间距）的影响。调查表明，莲花状流道可以有效地从通道壁表面去除液态水。适当的荷花流道高度可以有效降低荷花流道顶壁的水覆盖率。随着高度的增加，平均减阻率先增大后减小。当半径为25 μm和50 μm时，这些情况的平均减阻率明显高于其他情况。莲花状通道的间距对除水和水覆盖率有一些影响。高度为50μm，半径为50μm，间距为150μm的莲花状流道具有很高的减阻和防腐性能。本研究工作为流道提供了一种新的选择，对防腐减阻流道的设计具有一定的指导意义。