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

Autor(es)

Marum, Victor Jorge de Oliveira ^[1] ; Reis, Livia Bueno ^[1] ; Maffei, Felipe Silva ^[2] ; Ranjbarzadeh, Shahin ^[2] ; Korkischko, Ivan ^[3] ; Gioria, Rafael dos Santos ^[1] ; Meneghini, Julio Romano ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Escola Politecn, Dept Min & Petr Engn, BR-11013560 Santos, SP - Brazil

^[2] Univ Sao Paulo, Escola Politecn, Dept Mech Engn, BR-05508010 Sao Paulo, SP - Brazil

^[3] CNEN, IPEN, Nucl & Energy Res Inst, CECCO, BR-05508000 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ENERGY; v. 220, APR 1 2021.
• Citações Web of Science: 0

Resumo

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-epsilon, k-omega and k-omega SST) for incompressible-flow ejectors. A set of operational conditions (OP) was tested and results show that the k-omega 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. (c) 2021 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 18/11474-7 - Otimização topológica dos selos labirintos para aplicação de compressor de CO2
• Beneficiário: Shahin Ranjbarzadeh
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 14/50279-4 - Brasil Research Centre for Gas Innovation
• Beneficiário: Julio Romano Meneghini
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia
• Processo FAPESP: 19/05197-3 - Otimização paramétrica de geometria de ejetor para compressão
• Beneficiário: Lívia Bueno Reis
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 16/12397-0 - Otimização de campo de escoamento de células de combustível através de métodos numéricos
• Beneficiário: Ivan Korkischko
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado