燃料电池多通道蛇形流场的设计及优化

Design and Optimization of Multi-Channel Serpentine Flow Field for Fuel Cells

结合现有燃料电池流场设计的优点,为某燃料电池双极板设计多通道蛇形冷却水流道,利用计算流体动力学(computational fluid dynamics,CFD)技术进行流场仿真、改进和设计优化,进行试验验证。结果表明,仿真与试验结果吻合,原设计方案虽然满足压降和流量分配均匀性要求,但分支流道内流速过低,整个流场基本处于层流状态,不利于电堆散热。优化后的流场已基本发展为湍流,湍流度较高,增强了冷却效果,压降和流量分配也满足要求,表明优化方案冷却效果更好。

Summarizing the advantages of the existing fuel cell flow field design, a multi-channel serpentine cooling water flow channel is designed for a fuel cell bipolar plate. The flow field simulation is carried out by computational fluid dynamics (CFD) technology and verified by experiments. The results show that the simulation results are in well agreement with the test. The design scheme meets the requirements of pressure drop and flow distribution uniformity. However, the flow velocity in the branch flow channel is too low, and the whole flow field is basically laminar, which is not conducive to heat dissipation. The optimized design flow field has basically developed into turbulent flow, high turbulence, enhanced cooling effect, pressure drop and the flow distribution also meets the requirements, the measured results show that the scheme can meet the cooling demand better.