Performance analysis of a water ejector using Computational Fluid Dynamics (CFD) simulations and mathematical modeling
| Autor: | Lívia Bueno Reis, Julio Romano Meneghini, Ivan Korkischko, Shahin Ranjbarzadeh, Felipe Silva Maffei, Rafael dos Santos Gioria, Victor Jorge de Oliveira Marum |
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| Rok vydání: | 2021 |
| Předmět: |
020209 energy
DINÂMICA DOS FLUÍDOS COMPUTACIONAL 02 engineering and technology Computational fluid dynamics Industrial and Manufacturing Engineering Friction loss law.invention Physics::Fluid Dynamics 020401 chemical engineering law 0202 electrical engineering electronic engineering information engineering 0204 chemical engineering Electrical and Electronic Engineering Civil and Structural Engineering Mathematics Mathematical model Turbulence business.industry Mechanical Engineering Fluid mechanics Building and Construction Injector Mechanics Pollution Finite element method Boundary layer General Energy business |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | 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-e, 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. |
| Databáze: | OpenAIRE |
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