The diversity and complexity of the parameters involved in the modeling of proton exchange membrane fuel cells(PEMFCs)have restricted further research and applications of such cells,and the similarity theory is a prom...The diversity and complexity of the parameters involved in the modeling of proton exchange membrane fuel cells(PEMFCs)have restricted further research and applications of such cells,and the similarity theory is a promising solution to this problem.The similarity theory is an effective tool to obtain compact and generalized results with the same precision as that of the basic mathematical model.This paper presents a comprehensive review of the application of the similarity theory to most aspects of PEMFCs.The advantages of using the similarity theory,such as generality,reduction in the test effort,convenient comparisons and guidance to scale up the experiment,are discussed and analyzed.Although a number of similarity criteria have been proposed in recent years,the similarity theory is not as widely applied or well accepted in PEMFC research as in the heat transfer and fluid flow domain.The objective of this paper is to demonstrate the feasibility of performing a similarity analysis for such complex systems and encourage researchers to present a dimensionless expression of their results in the follow-up PEMFC research.A key challenge is to use the similarity analysis for a complete gas-water-electricity-heat-mechanics coupled with PEMFC system and obtain the correlation between the dimensionless output voltage/current and input similarity criteria.This review indicates that none of the existing models can achieve this objective,and further research pertaining to this aspect must be performed.Several recommendations to achieve this aim,including a hierarchical classification of the criteria,are provided.展开更多
基金the key project of National Natural Science Foundation of China(NNSFC)[Grant No.number 51836005]the National Key Research and Development Program[Grant num-ber 2017YFB0102702]+3 种基金the Foundation for Innovative Research Groups of the National Natural Science Foundation of China[Grant number 51721004]the Basic Research Project of Shaanxi Province[Grant num-ber 2019ZDXM3-01]the 111 Project[Grant number B16038]and the Key Science and Technology Project in Henan Province(Innovation Leading Project)[Grant number 191110210200].
文摘The diversity and complexity of the parameters involved in the modeling of proton exchange membrane fuel cells(PEMFCs)have restricted further research and applications of such cells,and the similarity theory is a promising solution to this problem.The similarity theory is an effective tool to obtain compact and generalized results with the same precision as that of the basic mathematical model.This paper presents a comprehensive review of the application of the similarity theory to most aspects of PEMFCs.The advantages of using the similarity theory,such as generality,reduction in the test effort,convenient comparisons and guidance to scale up the experiment,are discussed and analyzed.Although a number of similarity criteria have been proposed in recent years,the similarity theory is not as widely applied or well accepted in PEMFC research as in the heat transfer and fluid flow domain.The objective of this paper is to demonstrate the feasibility of performing a similarity analysis for such complex systems and encourage researchers to present a dimensionless expression of their results in the follow-up PEMFC research.A key challenge is to use the similarity analysis for a complete gas-water-electricity-heat-mechanics coupled with PEMFC system and obtain the correlation between the dimensionless output voltage/current and input similarity criteria.This review indicates that none of the existing models can achieve this objective,and further research pertaining to this aspect must be performed.Several recommendations to achieve this aim,including a hierarchical classification of the criteria,are provided.
