THE INFLUENCE OF GEOMETRICAL PARAMETERS ON THE EFFICIENCY OF THE LIQUID JET EJECTOR

Abstract

Ejectors are jet pumps in which energy to drive fluid is obtained from another fluid. Because they have no moving parts, liquid jet ejectors have found their application in many specific conditions of fluid transport, such as refrigeration, hydraulic transportation, mixing and homogenization of different liquids, changing characteristics of centrifugal pumps, etc. The disadvantage of ejectors is relatively low efficiency. This paper used a method of numerical simulation, the computational fluid dynamics (CFD) method, to study the influence of operating conditions and geometry parameters on the performance of an ejector. This research focuses on the effect of the geometrical and operating parameters of ejectors. Results of a CFD simulation aid the understanding of ejector characteristics and provide information for designing the ejector to suit different entrainment ratios. In addition, they provide a better understanding of the links between geometrical parameters and ejector efficiency. This paper investigates the effects of a few geometrical parameters on the ejector’s performance by numerical simulation. The lengths of the primary inlet, secondary inlet, mixing chamber, and diffuser are varied, along with the diameters of the primary and secondary inlet, nozzle, and diffuser. The ANSYS Fluent software package was used for numerical simulations. The primary and secondary fluid is water.