PEM燃料電池擋板型流道內擴散層表面結構對液滴流動特性的影響規(guī)律

打開文本圖片集

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“碳達峰、碳中和"戰(zhàn)略目標的推動下，傳統(tǒng)化石燃料（如煤炭、石油和天然氣）的過度開采和使用導致的大氣污染、溫室效應和酸雨等嚴峻環(huán)境狀況亟待改善。（剩余11939字）