This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The experimental studies are then carried out in our own laboratory for validation purposes. The parts of the physical model were printed on a STRATASYS 3D printer, or were cast from technical resin. The CFD analysis of the problem was implemented with the package Fluent in 2 dimensions using the axisymmetric approach. ![]() A part of this paper is devoted to the governing equations used at the definition of the flow through an ejector. This system has also the function of a cavitation protection due to the higher pressure present at the suction throat of the vacuum pump. In this paper, the authors submit an overview of the problematics of suction pressure reduction with a supersonic gas ejector used as a pre-stage of a liquid ring vacuum pump. * e-mail: supersonic gas ejector in conjunction with a liquid ring vacuum pump is used for creating and maintaining a vacuum in a chamber for technological purposes. Slovak University of Technology, Faculty of M.E., Institute of Energy Machinery, Námestie Slobody 17, 812 31 Bratislava, Slovakia ![]() ![]() Róbert Olšiak *, Marek Mlkvik, František Ridzoň and Pavol Slovák
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