基于鹦鹉螺仿生结构的流道对PEMFC性能提升研究

提出一种基于鹦鹉螺旋转结构的仿生流道并建立三维单相、等温的CFD数值模型进行多物理场模拟研究,该流道进气口位于中心位置,反应气体从流场中心进入,向周围环形流道依次流动。将传统蛇形流道与鹦鹉螺仿生流道进行数值模拟分析,发现鹦鹉螺仿生流道具有反应气体分布更加均匀、除水效果更好、浓差极化损失较小、输出性能更好等优势,相比蛇形流道的峰值电流密度提升46.77%、峰值功率密度提升21.53%。

STUDY ON IMPROVING PERFORMANCE OF PEMFC BY FLOW CHANNEL BASED ON NAUTILUS BIONIC STRUCTURE

A bionic flow channel based on nautilus structure is proposed and a three-dimensional single phase, isothermal CFD numerical model is established for multi-physical field simulation in present study. The inlet of the flow channel is located in the center, the reactants enter from the center of the flow channel and flow to the surrounding annular flow channel in turn. The traditional serpentine flow channel and the nautilus bionic flow channel are simulated and analyzed. It is found that nautilus bionic flow channel has more uniform distribution of reactants, better water removal, less loss of concentration polarization and better output performance. Compared with the serpentine flow channel, the peak current density increases by 46.77% and the peak power density increases by 21.53%.