Optimization Simulation Of The Performance Of Proton Exchange Membrane Fuel Cell

PEMFC (Proton Exchange Membrane Fuel Cell) is a new device of energyconversion, characterized by high power density, high efficiency of energy conversion,low temperature to start up, low level of noise, long life, and environmental friendliness.The prospects for the development is very good in the field of mobile power. It hasbecome one of the hot to national energy research institutes.It, the strength degree of gas transmission capacity inside reactant, will directlyaffect the performance of the fuel cell. And it is same to the changes of the operatingconditions and the temperature of the battery itself. So the optimization of the cell flowchannel structure, the depth of flow channels, the cases of gas getting in or out of the celland the cooling channel has a very important significance.In the first chapter, the work focuses on the origin and background of the topic. Thenin the second chapter, the work introduces the mathematical model of the fuel cellsimulation and describes the solving and computing process of CFD software. Then iestablish a single channel model of fuel cell and design different depth of gas flowchannel and add the triangle boss to the gas flow channel. The results show that with thedecrease of the depth of the gas flow, the performance of fuel cell is better. Addedtriangular bosses to the gas flow, the performance of fuel cell becomes better. In the sametime, added the sinusoidal bosses to the gas flow channel, the performance of the fuelcell also becomes better. In the last, increasing of amplitude of the sinusoidal boss, theperformance is gradually better.Research factors of single channel model of fuel cell are limited and the model isvery different from the actual fuel cell. The authors also designed a single-cell model often flow channels. The structure of anode and cathode contains single-snake model,two-snake model and a straight model. The ways of gas of the anode and cathode arefour kinds. Operating conditions of the single-cell model are different too. The results show that the performance of the single-snake model is better than other two models.And the performance of2-2model is best in the four ways of gas. With rising of thetemperature, the performance of fuel cell is firstly changing better and then changingworse. There is a best value near60℃. With increasing of operating pressure, the cellperformance is gradually increasing. While with reducing the value of the porosity in thediffusion layer, the performance of fuel cell is firstly changing better and then changingworse too. When the porosity is near0.3, fuel cell work on the best performance.At last, a new wavy structure of cooling channel in the fuel cell has been simulatedon the computer. In the result, the PEC of the wavy structure of cooling channel is largerthan1, indicating that within a certain range of Reynolds, this wave-shaped flow channelcan be used for PEMFC.