基于对称蛇形流场的PEMFC双极板流道尺寸优化

Optimization design of PEMFC bipolar plate channel dimensions based on symmetric serpentine flow field

基于对称蛇形流场双极板,采用中心复合试验设计方法,以双极板流道结构参数为优化变量,以质子交换膜燃料电池(PEMFC)最大功率密度和双极板流道进出口压差为目标,通过试验设计和数值模拟的方法研究了基于最优对称蛇形流场尺寸的PEMFC的内部流动特性和电化学性能,并与优化前比较。优化设计结果表明,对最大功率密度和压差影响最大的因素分别为双极板流场直线型流道宽度和流道深度;当辅助流道宽度为1 mm,脊宽为1.4 mm时,直线型流道宽度的最佳取值范围为1.14~1.68 mm,流道深度的最佳取值范围为0.9~1.51 mm。在相同条件下,双极板流道优化后对称蛇形流场PEMFC最大功率密度为0.662 W/cm^(2),相比于优化前的最大功率密度(0.601 W/cm^(2))提高了10%。

Based on the symmetric serpentine flow field bipolar plate,the design method of central composite experiments was adopted,with the bipolar plate flow channel structural parameters as the optimization variables,and the maximum power density of the PEMFC and the differential pressure between the inlet and outlet of the bipolar plate flow channel as the objectives.The internal flow characteristics and electrochemical properties of PEMFC based on the optimal symmetric serpentine flow field dimensions were investigated by means of experimental design and numerical simulation,and compared with the unoptimized flow field.The optimization design results show that the greatest influence factors on the maximum power density and the differential pressure are the linear flow channel width and depth of the bipolar plate flow field,respectively.When the auxiliary flow channel width is 1 mm and the ridge width is 1.4 mm,the optimal range of linear runner width is 1.14-1.68 mm and the optimal range of flow channel depth is 0.9-1.51 mm.Under the same conditions,the maximum power density of the symmetric serpentine flow field PEMFC with the optimized bipolar plate flow channel is 0.662 W/cm^(2),which is 10%higher than that(0.601 W/cm^(2))of the unoptimized flow channel.