Establishment method for total-cell three-dimensional two-phase model of proton exchange membrane fuel cell

Abstract

The invention discloses an establishment method for a total-cell three-dimensional two-phase model of a proton exchange membrane fuel cell. The model construction method comprises the steps of constructing a global conservation equation, constructing a liquid water distribution relevant conservation equation, constructing an electrochemical reaction relevant conservation equation, introducing a catalyst layer agglomerate model and constructing an expression of conservation equation source items. Relevant equations are established according to the steps, and through numerical solving calculation, gas concentration distribution, liquid water volume fraction distribution, membrane water distribution and cell performance in the proton exchange membrane fuel cell under a catalyst particle volume fraction and an electrolyte volume fraction in catalyst layers can be obtained. Most traditional models ignore liquid water in channels or do not consider the influence of gas-liquid phase change inthe channels. According to the model, a liquid water saturation equation is solved in the channels, and the gas-liquid phase change process is considered; and after liquid water distribution in the channels is obtained, the influence of liquid water on gas flowing in the channels is reflected through correction of a viscosity value in a gas momentum equation, and therefore a good data basis is provided for further research.

Description

technical field [0001] The invention belongs to the field of electrochemical fuel cells, and in particular relates to a method for establishing a calculation model for a proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is widely considered as a promising clean energy technology due to its high power density, fast start-up, and high conversion efficiency. In recent years, proton exchange membrane fuel cells have made great progress in terms of performance improvement, fuel storage, power supply, etc., but some technical difficulties still hinder the commercialization of proton exchange membrane fuel cells. The proton exchange membrane fuel cell is a device that directly converts the chemical energy in the fuel (hydrogen) into electrical energy through an internal electrochemical reaction. It involves complex mass transfer, heat transfer and reaction mechanisms. The derived water heat management, The limitations of r...

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Problems solved by technology

[0004] Due to the complexity of the internal transport process of the proton exchange membrane fuel cell and the limitation of computing power, the traditional fuel cell model has been greatly simplified for specific problems, making it difficult to truly reflect the internal transport process of the proton exchange membrane fuel cell

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