气态进料直接甲醇燃料电池的二维数值模拟

摘要

A two-dimensional,two-phase,and non-isothermal model is developed for a vapor-feed direct methanol fuel cell (DMFC) based on alkaline anion exchange membrane system by using the multi-fluid approach.The model will lead to better understanding of the mass-transfer and electrochemical phenomenon in the cell.In the model,the vapor generated from the liquid methanol in the tank goes through a composite material made of Nafion membrane and hydrophobic porous layer into the cell.In the study,the vapor transport layer (VTL) and micro porous layer (MPL) are taken into account,and two symmetrical exits in the VTL are set for the CO2 removal.With this model,effects of the CO2 exit length and the hydrophobic MPL on performance and inner water distribution of DMFC are investigated.%基于多相流理论,建立被动式气态甲醇进料碱性阴离子交换膜直接甲醇燃料电池的二维两相非等温模型,研究电池内部的质量传输和电化学现象.在模型中,液态甲醇蒸发形成蒸汽,通过由Nafion膜与疏水的多孔介质复合而成的材料进入电池.模型考虑气体传输层(VTL)和微孔层(MPL),在VTL的两侧对称地开两个微孔,便于CO2的外排.讨论不同CO2开口大小对电池性能的影响和MPL的疏水性对电池内部水分布以及性能的影响.