全钒液流电池流场模拟与优化

Simulation and optimization of flow field of all vanadium redox flow battery

流场结构是影响全钒液流电池性能的关键问题之一。基于CFD技术建立全钒液流电池流场的二维数学模型,通过模拟获得在给定流场结构下电解液在石墨毡电极内的分布规律,优化流场结构提高电解液在石墨毡电极内分布的均匀性。研究结果表明,增加分配口个数和延长入口竖直主流道的长度能够有效提高电解液的分配均匀性;同时考察了分配流道宽度和流量对电解液分配均匀性的影响;所得结论对全钒液流电池流场结构设计具有重要的指导意义。

The structure of flow field is one of the key factors that affect the performance of all vanadium redox flow battery.A two-dimensional model for the flow field of all vanadium redox flow battery was proposed based on CFD technology.The distribution of electrolyte in electrode in the specified structure of flow field could be obtained by the proposed model.The flow field was optimized to enhance the distributional uniformity of electrolyte in electrode.The conclusion indicates that the distributional uniformity can be improved by increasing the number of distributional ports and extending the length of inlet vertical channel.Meanwhile,the effects of width of distributional channel and flow rate on distributional uniformity of electrolyte were considered.The conclusion has great guidance for the design of flow field of all vanadium redox flow battery.