PEMFC阴极排水的研究

Study on water discharging in the cathode of PEMFC

采用可视化方法研究了直条单流道质子交换膜燃料电池(PEMFC)阴极排水过程。通过分析流道首次液态排水时间和平均液态排水间隔时间的变化,研究了电流密度、增湿温度和气体流速等对阴极排水过程的影响。阴极气体非饱和增湿时,生成水以水蒸气和液态水两种方式排出,水蒸气排水为连续过程,液态排水为间歇过程。随着电流密度和相对湿度的提高,液态水的积累速度增加;随着气体流速的增大,生成的水以水蒸气方式排出的比例增大。

Water discharging in the cathode of PEMFC with single straight flow channel was studied by visualization method. The first and average liquid state water discharging time between adjacent water discharging was introduced to investigate the effects of current density, humidified temperature and gas flow rate on the water discharging in the cathode. When the cathode gas was unsaturated, water was discharged by means of vapor and liquid state water discharging. Vapor state water discharging was continuous, while liquid state water discharging was intermittent. The accumulation rate of liquid state water increased with the increasing of the current density and relative humidity and more water was blown out as vapor state with the increasing of gas flow rate.