Open AccessNumerical investigations of the flow distributions with a transient three-dimensional multi-component ejector model
Author(s) -
Zhanrui Liu,
Kui Jiao,
Zirong Yang,
Qing Du
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/721/1/012012
Subject(s) - nozzle , injector , mechanics , transient (computer programming) , condensation , flow (mathematics) , materials science , thermodynamics , mass flow , mass flow rate , physics , computer science , operating system
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.