Flow Analysis in Various Ejectors Configurations

Abstract

In this paper, a detailed behavior of classical ejectors assisted by the Coandã effect (with one or two supply pressure reservoirs) is analyzed using a formulation of RANS equations for axisymmetric flow with a shear stress transport (SST) k-omega turbulence model. Furthermore, numerical investigations of the evolution laws of the critical Reynolds number are carried out, when the jet is attached to the wall by the Coandã effect, considering three geometric configurations: sudden expansion with or without divergent at the inlet and open cavity. The variety of flow structure and the related bifurcation and flow instability are provided. All these investigations provide us with information about the conditions and limits in which the Coandã effect can improve the performance characteristics of a device.