| The spray humidifier on the PEMFC stack test platform can be used to simulate the humidification state of the reactor gas.It is an important component for studying the dynamic water management of a PEMFC stack,but there is little research on it.In order to better understand the influence of the structure and operating parameters of the spray humidifier on the gas humidification state,this paper used ANSYS Fluent software to simulate the spray humidifier in the PEMFC stack test platform.The numerical model of the humidifier was simplified and established in accordance with the original physical model and its actual working conditions.It was then verified to be reliable by comparing the simulation results with the experimental results.The humidification performance was analyzed and the results showed the temperature and humidity distribution at the outlet of the humidifier is uneven under standard working condition.Therefore,the operation parameters of the humidification process were investigated and the results showed that when the inlet gas was fixed at certain status,the average temperature and humidity of the outlet gas can be increased by increasing the injection water mass flow and temperature,and when the injection water was fixed at certain status,the gas could attain better humidification by reducing the inlet gas mass flow.However,the increase of the inlet air temperature is not conducive to gas humidification.In order to further improve the humidification performance,structure optimization was carried out.The results showed that reducing the distance between the nozzle and the wall of the humidifier,changing the injection direction to spray vertically downward and adjusting the nozzle layout to staggered arrangement can improve the humidification performance.Meanwhile,under the maximum inlet gas mass flow,the outlet gas can obtain a better humidification effect when the spray droplet size is around 50μm. |
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