Simulation And Optimization For Flow Channel Structure Of Fuel Cell Based On Fluent

With the intensification of environmental pollution,greenhouse effect and energy shortage,it is urgent to develop new energy sources instead of traditional fossil fuels.Fuel cell is considered to be the fourth power generation facility after hydropower,thermal power and nuclear power.And it is increasingly concerned by governments and multinational corporations.The fuel cell flow channel has the function of transmitting the reaction gas and ensuring the uniform distribution of the reaction gas in the flow field.In this paper,the fuel cell channel is modeled,simulated and optimized.Firstly,the structure,working principle,basic classification,advantages and disadvantages of fuel cell are described.The theoretical output voltage of proton exchange membrane fuel cell was analyzed thermodynamically.The activation loss,Ohm loss and concentration loss in the working process of proton exchange membrane fuel cell were discussed according to the reaction kinetics,and a mathematical model was established,and the actual output voltage of proton exchange membrane fuel cell was calculated.According to the fluid mechanics,the law of the internal flow of proton exchange membrane fuel cell is analyzed,and the fluid mechanics model is established.According to the depth,width and bank width of the fuel cell channel,the geometry model of fuel cell with different flow path size is established for rectangular channel.The working process of fuel cell is calculated by Fluent simulation,and the distribution of pressure in the flow channel,the concentration of material and substance,temperature and water concentration are studied.The results show that the performance of fuel cell is better when the channel depth is 0.4mm,the width of the channel width and the width of the bank width are 0.7mm(the width of the single channel module is 2.1mm).The effects of the shape of rectangle,triangle,trapezoid,semicircle and inverted trapezium on the performance of fuel cell are studied.The results show that the fuel cell performance of the triangle section flow channel is better,and the drainage and heat dissipation of the inverted trapezoid channel are better.Based on the optimum cross section size parameters,a number of protruding platforms are added in the rectangular channel with better strength performance and the inclined channel is designed,and the corresponding geometric model is established,and the influence of the channel on the performance of the fuel cell is studied.The results show that the performance of fuel cell can be improved by adding the platforms or using an inclined channel.In this paper,the influence of the cross section size,cross section shape and channel protruding platform on the performance of the fuel cell is studied through simulation.It has some positive significance to the research of fuel cell and the development of the industry.