Research On The Efficient Heat Management System Of Fuel Cell Based On The Principle Of Turbulent Enhanced Heat Transfer

Since the 20 st century,due to the widespread use of petrochemical energy,the greenhouse effect has become more and more serious.The fuel cell due to its green and energy-saving advantages,has become the focus of research in the field of energy countries.In addition to the general advantages of fuel cells,proton exchange membrane fuel cell(PEMFC)also have a high specific power,simple structure and low operating temperatures advantages.As a power supply device,it is widely used in the transportation industry and other mobile facilities.However,proton exchange membrane fuel cells have strict requirements on their own hydrothermal conditions,and their life and performance are closely related to the hydrothermal conditions.At the same time,they also affect the use of fuel cell vehicles,which is one of the key issues to be solved urgently.Based on the problem of fuel cell thermal management,this paper studies a fuel cell high-efficiency thermal management system based on the principle of turbulenceenhanced heat transfer.First,establish a proton exchange membrane fuel cell single simulation model,and build the model in Fluent to perform simulation calculations.By comparing and analyzing the relevant experimental data of the fuel cell tested under the same operating conditions with the data obtained from the model,the results are verified.The accuracy and accuracy of the established simulation model.On this basis,the heat production and heat transfer characteristics of the proton exchange membrane battery are studied,and the temperature,pressure,humidity and other parameters of the proton exchange membrane fuel cell temperature distribution law are revealed,and the basis for the next step is provided.Secondly,based on the thermal characteristics of the proton exchange membrane fuel cell that have been obtained,combined with the principle of turbulence enhancement heat transfer,a thermal management plan for the proton exchange membrane fuel cell combining the split fins and liquid cooling is proposed,and the length,angle,and coolant flow rate of the split fins are analyzed.The influence of the parameters on the thermal management system of this configuration shows that the improved thermal management system of the proton exchange membrane fuel cell can enhance the heat transfer of the cooling channel in the target cell.The optimal solution is the length of the shunt With a structure of 1mm and an angle of 45°,the maximum heat exchange rate is increased by 12%,and the temperature of the proton exchange membrane is reduced by 0.15°C.However,the improved thermal management scheme based on the combination of enhanced heat transfer splitter and liquid cooling will cause the flow resistance in the flow channel to increase.In order to verify the application effect of the above research model on the fuel cell system,this paper then uses AEMsim to build a 1D model of the proton exchange membrane fuel cell system for analysis.In NEDC operating conditions,the use of shunts can improve the performance of the fuel cell thermal management system,and in suburban operating conditions,the battery temperature can be reduced by about1.6°C.