PEM燃料电池挡板型流道内扩散层表面结构对液滴流动特性的影响规律

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Influence of the diffusion layer surface structure on droplet flow characteristics in the PEMFC with a baffle flow channel

SONG Jiaojiao1，WANG Han1， ZHANG Xiaojian1，YANG Ruoxi2，CAO Bo， WANG Yulin*1，ZHANG Jianbo2

（1.TianjinKeyLboratoryfRefrigerationTechnologyanjinUniversityofommerce，anjin334，Cina； 2.StateKeyboratoryftellgentreenehicledbilitysingaUvesityeiinga； 3.BohaiNewEnergy（Hefei）Co.，Ltd，Hefei230ooo，China）

Abstract： Inorder to improve the transport characteristics of liquid water insidea proton exchange membrane fuel cell（PEMFC），thesurface structure characteristicsof the gas difusion layer（GDL） wereobtained bywhite lightinterferometryandtheseateddropmethod，andtheinfluenceofthesurfacestructureof thediffusion layer insidethe baffle-type flowchannelon the flowcharacteristicsof the dropletswas investigatedbythe volumeof-fluid（VOF）method.The results show that，regardlessofwhether the surface structureofGDLisconsidered ornot，the hydrophobicityof thesurfaceissignificantlyenhancedwith the increaseofpolytetrafluoroethylene （PTFE）content inGDL，which leads totheshorteningof the outflow timeof droplets inthe baffle-typerunner， thereductionof the spreading areaof thedroplets，and thecorresponding reductionof the pressure drop in therunner.And compared with the smooth GDL surface，the irregular structure and pore characteristics of theactual rough GDLsurface significantly enhance thedropletadhesion，resulting ina longer flow timeof the dropletson the rough surface，the spreading area increasing，and the pressure dropin the flow channel increasing.When the PTFE mass percentage content is 40% ，the droplet flow time on the actual rough GDL surface is shortened by 28.57% ，the pressure drop in the flowchannel is reduced by 16.32% ，and the spreading areaof the droplets showesa tendency to decrease.

Key words： proton exchange membrane fuelcells （PEMFC）；surface structure of gas difusion layer；bafle flowchannel；droplet flowcharacteristics

在“碳达峰、碳中和"战略目标的推动下，传统化石燃料（如煤炭、石油和天然气）的过度开采和使用导致的大气污染、温室效应和酸雨等严峻环境状况亟待改善。（剩余11939字）