Numerical investigations of the flow distributions with a transient three-dimensional multi-component ejector model. (January 2020)

• Record Type: Journal Article
• Authors: Liu, Zhanrui; Jiao, Kui; Yang, Zirong; Du, Qing
• Is Part Of: IOP conference series. Volume 721(2020)
• Publication Date: 2020-01
• Subjects: Materials science -- Periodicals; 620.1105
• DOI: 10.1088/1757-899X/721/1/012012
• Languages: English
• ISSNs: 1757-8981

Abstract

Abstract: Ejector is a promising hydrogen recirculation for proton exchange membrane fuel cell (PEMFC) systems since it does not require parasitic power consumption. However, the complicated transport mechanisms inside the ejector remain unclear. In this study, the heat and mass transport processes are investigated by a transient three-dimensional multi-component model. The distribution of velocity, temperature, and pressure are presented. To avoid water vapor condensation, the maximum primary flow pressure should be limited to prevent the formation of a low temperature region at the nozzle throat. Compared with the converging-diverging nozzle, the convergent nozzle is recommended since it increases the condensation of water vapor. To predict the lowest temperature, the relationship between the relative pressure and the temperature is further obtained by curve fitting methods.