During Fuel Cell Vehicle(FCV)operation,the liquid water in gas diffusion media(GDM)prevents the reaction gas from reaching the reaction zone and lead to output power fluctuation and reduce the lifespan of FCV.In the p...During Fuel Cell Vehicle(FCV)operation,the liquid water in gas diffusion media(GDM)prevents the reaction gas from reaching the reaction zone and lead to output power fluctuation and reduce the lifespan of FCV.In the present research,hydrophobicity gradient settings of micro-porous layer(MPL)and gas diffusion layer(GDL)are optimized to improve the water removal ability of GDM.Computational fluid dynamics(CFD)model is constructed for numerical simulations to analyze the fuel cell power output and the water content in the GDM with different hydrophobicity gradients.Experiments with different hydrophobicity gradients,which are specifically prepared with corresponding concentrations of polytetrafluoroethylene(PTFE)solutions,are conducted for validation of simulation results.It is shown that the positive hydrophobicity gradient of MPL and GDL provides a better capacity for water removal and oxygen transport.The contact angles of MPL and GDL are further optimized as 147.9°-138.6°by genetic algorithm integrated with the CFD simulations.展开更多
An adaptable product can satisfy different customer requirements by changing its configuration and parameter values during the operation stage. Design of adaptable products aims at reducing the environment impact thro...An adaptable product can satisfy different customer requirements by changing its configuration and parameter values during the operation stage. Design of adaptable products aims at reducing the environment impact through replacement of multiple different products with single adaptable ones. Due to the complex architec- ture, multiple functional requirements, and changes of product configurations and parameter values in operation, impact of uncertainties to the functional performance measures needs to be considered in design of adaptable products. In this paper, a robust design approach is introduced to identify the optimal design configuration and parameters of an adaptable product whose functional performance measures are the least sensitive to uncertain- ties. An adaptable product in this paper is modeled by both configurations and parameters. At the configuration level, methods to model different product configuration candi- dates in design and different product configuration states in operation to satisfy design requirements are introduced. At the parameter level, four types of product/operating parameters and relations among these parameters are discussed. A two-level optimization approach is developed to identify the optimal design configuration and its parameter values of the adaptable product. A case study is implemented to illustrate the effectiveness of the newly developed robust adaptable design method.展开更多
基金supported by the National Natural Science Foundation of China(51975196 and 52075159)the Virtual Reality Key Application Technology Research(Revealed and Commanded)Project of Jiangxi Province(20213ABC03V01)+1 种基金the High Level and High Skill Leading Talent Training Project of Jiangxi Province,the Jiangxi Provincial Natural Science Foundation(20224ACB218002)the open foundation of State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures,Guangxi University(2022GXYSOF24).
文摘During Fuel Cell Vehicle(FCV)operation,the liquid water in gas diffusion media(GDM)prevents the reaction gas from reaching the reaction zone and lead to output power fluctuation and reduce the lifespan of FCV.In the present research,hydrophobicity gradient settings of micro-porous layer(MPL)and gas diffusion layer(GDL)are optimized to improve the water removal ability of GDM.Computational fluid dynamics(CFD)model is constructed for numerical simulations to analyze the fuel cell power output and the water content in the GDM with different hydrophobicity gradients.Experiments with different hydrophobicity gradients,which are specifically prepared with corresponding concentrations of polytetrafluoroethylene(PTFE)solutions,are conducted for validation of simulation results.It is shown that the positive hydrophobicity gradient of MPL and GDL provides a better capacity for water removal and oxygen transport.The contact angles of MPL and GDL are further optimized as 147.9°-138.6°by genetic algorithm integrated with the CFD simulations.
文摘An adaptable product can satisfy different customer requirements by changing its configuration and parameter values during the operation stage. Design of adaptable products aims at reducing the environment impact through replacement of multiple different products with single adaptable ones. Due to the complex architec- ture, multiple functional requirements, and changes of product configurations and parameter values in operation, impact of uncertainties to the functional performance measures needs to be considered in design of adaptable products. In this paper, a robust design approach is introduced to identify the optimal design configuration and parameters of an adaptable product whose functional performance measures are the least sensitive to uncertain- ties. An adaptable product in this paper is modeled by both configurations and parameters. At the configuration level, methods to model different product configuration candi- dates in design and different product configuration states in operation to satisfy design requirements are introduced. At the parameter level, four types of product/operating parameters and relations among these parameters are discussed. A two-level optimization approach is developed to identify the optimal design configuration and its parameter values of the adaptable product. A case study is implemented to illustrate the effectiveness of the newly developed robust adaptable design method.
