CFD analysis of ejector in a combined ejector cooling system |
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Authors: | E Rusly Lu Aye WWS Charters A Ooi |
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Affiliation: | aInternational Technologies Centre (IDTC), Department of Civil and Environmental Engineering, The University of Melbourne, Melbourne, Vic. 3010, Australia;bDepartment of Mechanical and Manufacturing Engineering, The University of Melbourne, Melbourne, Vic. 3010, Australia |
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Abstract: | One-dimensional ejector analyses often use coefficients derived from experimental data for a set of operating conditions with limited functionality. In this study, several ejector designs were modelled using finite volume CFD techniques to resolve the flow dynamics in the ejectors. The CFD results were validated with available experimental data. Flow field analyses and predictions of ejector performance outside the experimental range were also carried out. During validation, data from CFD predicted the entrainment ratios with greater accuracy on definite area ratios, although no shock was recorded in the ejector. Predictions outside the experimental range—at operating conditions in a combined ejector–vapour compression system—and flow conditions resulting from ejector geometry variations are discussed. It is found that the maximum entrainment ratio happens in the ejector just before a shock occurs and that the position of the nozzle is an important ejector design parameter. |
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Keywords: | Refrigerating system Ejector system Modelling CFD PerformanceMots clé s: Systè me frigorifique Systè me à é jecteur Modé lisation Dynamique numé rique des fluides Performance |
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