Effects of baffle position in serpentine flow channel on the performance of proton exchange membrane fuel cells  

作　　者：Guodong Xia Xiaoya Zhang Dandan Ma 

机构地区：[1]MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation,Beijing Key Laboratory of Heat Transfer and Energy Conversion,Beijing University of Technology,Beijing 100124,China

出　　处：《Chinese Journal of Chemical Engineering》2024年第5期250-262,共13页中国化学工程学报（英文版）

基　　金：financially supported by the Science&Technology Project of Beijing Education Committee(KM202210005013);National Natural Science Foundation of China(52306180)。

摘　　要：This study used a three-dimensional numerical model of a proton exchange membrane fuel cell with five types of channels:a smooth channel(Case 1);eight rectangular baffles were arranged in the upstream(Case 2),midstream(Case 3),downstream(Case 4),and the entire cathode flow channel(Case 5)to study the effects of baffle position on mass transport,power density,net power,etc.Moreover,the effects of back pressure and humidity on the voltage were investigated.Results showed that compared to smooth channels,the oxygen and water transport facilitation at the diffusion layer-channel interface were added 11.53%-20.60%and 7.81%-9.80%at 1.68 A·cm^(-2)by adding baffles.The closer the baffles were to upstream,the higher the total oxygen flux,but the lower the flux uniformity the worse the water removal.The oxygen flux of upstream baffles was 8.14%higher than that of downstream baffles,but oxygen flux uniformity decreased by 18.96%at 1.68 A·cm^(-2).The order of water removal and voltage improvement was Case 4>Case 5>Case 3>Case 2>Case 1.Net power of Case 4 was 9.87%higher than that of the smooth channel.To the Case 4,when the cell worked under low back pressure or high humidity,the voltage increments were higher.The potential increment for the back pressure of 0 atm was 0.9%higher than that of 2 atm(1 atm=101.325 kPa).The potential increment for the humidity of 100%was 7.89%higher than that of 50%.

关 键 词：Proton exchange membrane fuel cell Baffle position Mass transfer Net power UNIFORMITY Voltage increment 

分 类 号：TM911.4[电气工程—电力电子与电力传动]