Performance analysis of a water ejector using Computational Fluid Dynamics (CFD) simulations and mathematical modeling

Victor Jorge de Oliveira Marum, Lívia Bueno Reis, Felipe Silva Maffei, Shahin Ranjbarzadeh, Ivan Korkischko, Rafael dos Santos Gioria and Julio Romano Meneghini

Energy, 2021, vol. 220, issue C

Abstract: A quasi-one-dimensional (1D) mathematical model coupled with Computational Fluid Dynamics (CFD) simulations of a water ejector is presented. Using data from CFD simulations, the mathematical model was used to calculate the friction loss coefficients of the ejector components, to predict its maximum efficiency point and to delimit its envelope of operation. The CFD approach was validated with experimental data and employed the finite element method to test the main turbulence models found in the literature (k-ε, k-ω and k-ω SST) for incompressible-flow ejectors. A set of operational conditions (OP) was tested and results show that the k-ω SST turbulence model is the most suitable to capture the ejector flow characteristics in all OP. In addition, for higher entrainment ratio (M) values, it was observed a possible correlation between how well the boundary layer can be solved and how the model is able to capture the ejector efficiency curve. Moreover, for lower M values, another possible correlation may be stated between how the turbulence model is able to capture the velocity profile.

Keywords: Ejector; Efficiency; Mathematical modeling; Computational Fluid Dynamics (CFD) (search for similar items in EconPapers)
Date: 2021
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Citations: View citations in EconPapers (4)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:220:y:2021:i:c:s0360544221000281

DOI: 10.1016/j.energy.2021.119779

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