Study On Cathode Channel Of Proton Exchange Membrane Fuel Cell Based On Ship Block

Proton exchange membrane fuel cell(PEMFC)is an automobile power source with great development potential in the future because of its advantages of clean and environmental protection,high energy density,low noise in use and short hydrogen charging time.However,during the operation of proton exchange membrane fuel cell,the cathode channel is prone to water flooding,which leads to gas starvation and the attenuation of cell performance and life.Therefore,based on the research of ship design and its resistance characteristics,a new ship block cathode channel is established to promote the drainage and mass transfer performance of proton exchange membrane fuel cell cathode channel.The main research contents are as follows:(1)Based on the design of KCs standard ship form and its resistance theory,the ship block model is designed.Then,according to the ship length width ratio L/B and ship width draft ratio B/T,the blocking block is optimized to reduce the fluid resistance of the blocking block and optimize the water management of the cathode of proton exchange membrane fuel cell.Finally,the volume of fluid model VOF(volume of fluid)is used to simulate the ship block with different sizes.The three-dimensional diagram of cathode channel,the integral of liquid water in channel,the area of diffusion layer and pressure drop are compared and analyzed.The simulation results show that when the ship shape aspect ratio L/B= 7 and the ship width draft ratio B/T = 4.2,the drainage efficiency of the cathode channel is higher,the residual water in the channel is less and the droplet distribution is more reasonable.(2)The fluid performance experiment is designed to simulate the intake air and moisture generation under common battery conditions,and the gray scale of the experimental results is calibrated.By comparing and analyzing the fluid characteristics of channels with different structures,it is finally verified that the optimized ship block has better fluid characteristics and can enhance the drainage performance of channels.(3)The performance simulation of fuel cell is carried out for the ship block model and the DC channel model.According to the static pressure of gas in the channel,the water content in the membrane,the molar concentration of oxygen in different parts,the gas velocity vector and other indicators,the reasons for the ship block to enhance the mass transfer and drainage capacity and improve the performance of the battery are analyzed.The advantages of optimizing the ship block in the performance of the battery are shown through the polarization curve,The reliability of the block design is verified.In this paper,the cathode channel of proton exchange membrane fuel cell designed based on the ship block design theory can effectively improve the mass transfer performance of the cell and reduce the occurrence of water flooding.It provides a new solution for solving the problem of water management and improving the performance of the fuel cell,and has a certain theoretical guiding value.