Flow Field Design And Simulation Of High Temperature Solid Oxide Fuel Cell

High temperature solid oxide fuel cell(SOFC)has become a research hotspot in electric energy conversion devices due to its high conversion efficiency,wide fuel applicability,high waste heat utilization value,and the ability to form a combined cycle power generation system.However,SOFCs still have many problems to be improved,such as the cell power density still has room to rise,the cell structure strength is low,and the economy costs to be improved.This requires structural optimization of the SOFCs and improves the uniform distribution of the flow field parameters in the cell.As an important method,numerical simulation and calculation has played an important role in the optimization of flow field configuration and power prediction of cell,and has become an important tool for many scholars to study SOFCs.In this paper,the numerical modeling of SOFCs is developed,and the computational fluid dynamics(CFD)method is used to simulate the multiphysics and electrochemical reactions of SOFCs.The research in this paper starts from two steps.First,starting with the most basic SOFC unit,discuss the main factors affecting the performance of SOFC unit and the optimization of SOFC unit.Second,the research object is extended to the SOFC cell,which is discussed separately from the external flow field of the cell and the internal flow field.In terms of the external flow field,the size design of the external manifold and its flow field uniformity at different flow rates are mainly discussed,so that the optimal solution of the outer manifold is obtained,which satisfies the requirement of high flow field uniformity and realizes optimized improvement of power density;in terms of internal flow field,this paper improves the traditional SOFC flow field design with parallel gas channels,and adds two pressure equalization slots to the internal flow field.Then compare the flow uniformity and the output performance before and after the pressure equalization slots is added.The calculation results verify the important role of the pressure equalization slots in the optimization of SOFCs.