Numerical Simulation Research On Multiphysics Of Tubular Proton Exchange Membrane Fuel Cell

Energy is considered to be the driving force of the global economy.The proton exchange membrane fuel cell(proton exchange membrane fuel cell,PEMFC)of fuel has the advantages of high power density,low operating temperature,fast start-up,good response to load changes,and zero emissions.An important part of a sustainable energy system.As an important factor affecting the performance of PEMFC,the structure of PEMFC has always been the focus of research.This paper takes the tubular PEMFC model as the research object,carries on the numerical simulation under the same working state through four different structure single cell models,and analyzes the related parameters that affect the cell performance.The main content of this article is divided into four parts:(1)Using COMSOL Multiphysics and SOLIDWORKS software to construct various PEMFC models with different structures.The concentration distribution draws in the details of the cell,the power density curve,the pressure and the net work curve.The four output models were compared with the downstream and counter-flow methods to synthesize the performance of the PEMFC model.Robust: Current density and power structure generated by the tubular PEMFC single cell model.Among the different structure states of the basic cell model PEMFC,the solid string model(SC)shows the highest current density and power,and has the highest output net power.Compared with the flow input mode,the tubular PEMFC model of the counter-flow input mode has a higher output power.And the use of counter-flow input mode can increase the permeability of the substance.The SC model under the counter-flow input mode has the best battery performance,and its maximum net performance selectivity is 3.35 W.(2)Taking the tubular square chord(SC)model as the research object,by changing the porosity of the cathode gas diffusion layer,the fuel cell performance under different cathode GDL porosity was compared and analyzed.Finally,by controlling the humidification temperature and the air stoichiometric ratio of the cathode and anode inlet gas,the influence of its change on the performance of the tubular PEMFC is studied.Enlarging the cathode GDL porosity can improve the output performance of the fuel cell,and the influence of the porosity change on the cell performance curve becomes more significant with the increase of the current density.The maximum temperature of PEM corresponding to different porosity models decreases with the increase of battery voltage.At the same time,the cathode and anode air inlet humidification temperature is changed,and the cell current density first increases and then decreases with the increase of the humidification temperature.When the humidification temperature is 60℃,the output performance of the counterflow SC structure is the best.Separately change the cathode or anode humidification temperature.Under high working voltage,the current density increases with the increase of the humidifying temperature of the inlet gas,but the current density output by the fuel cell does not change significantly;under low working voltage,the current density increases with The humidification temperature increases and decreases,and the current density of the cell changes more when the degree of humidification of the cathode gas is changed,which has a significant impact on the battery performance.The performance of the fuel cell increases as the air stoichiometric ratio increases.