Journal of Materials and Engineering Structures
Volume 8, Numéro 4, Pages 477-490
2021-12-30
Flow And Mixing Structure In A Supersonic Gas-gas Ejector Installed In A Refrigeration System With A Load Capacity Of 10tr
Authors : Hamzaoui Malek . Nesreddine Hakim . Aidoun Zine .
Abstract
The complexity of the flow in an ejector requires very careful visualization in order to describe the ejector behavior. This paper is based on a numerical simulation of the flow of R245fa through the gas-gas supersonic ejector installed in a real refrigeration system with a nominal capacity of 10 TR. The k-e RNG turbulence model is chosen for two modes of ejector operation, critical and sub-critical. Analysis shows that back pressure significantly affects both induced refrigerant flow and ejector operating regime. The use of the NIST-REFPROP database and a mesh adapted for each simulation allows to give results very close to the physical reality such that for the critical (on design) regime the relative errors do not exceed 4%, on the other hand, in under critical conditions (off design), they are of the order of 14%.
Keywords
Ejector ; CFD ; R245fa ; Refrigeration
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