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Three-dimensional Numerical Investigations on Ejector of Vapour Jet Refrigeration System

Performance of vapour jet refrigeration system is based on satisfactory operation of ejector. Hence, the present work focuses on enhancing the performance of the ejector using three-dimensional CFD analysis with refrigerant R134a by introducing swirl in the primary stream of ejector, using swirl generators. In literature, compressible and twodimensional axisymmetric swirl flow ejector with ideal gas assumption has been investigated. The novelty of the present work is the three-dimensional analysis of swirl flow ejector working with refrigerant R134a, considering real gas behavior using k-e turbulence model. Real gas thermodynamic behaviour and transport properties of R134a have been obtained using 'NIST Real Gas Model' that uses REFPROP subroutines. Shock patterns, Mach number, radial velocity and tangential velocity variations along the ejector have been studied for a set of operating conditions. Results indicate that the entrainment ratio gets improved for the ejector in presence of swirl by about 6% as compared to the ejector with no swirl, thereby improved coefficient of performance of vapour jet refrigeration system.