| Issue |
Mechanics & Industry
Volume 20, Number 7, 2019
Application of Experimental and Numerical Methods in Fluid Mechanics and Energy
|
|
|---|---|---|
| Article Number | 703 | |
| Number of page(s) | 11 | |
| DOI | https://doi.org/10.1051/meca/2019069 | |
| Published online | 20 November 2019 | |
Regular Article
Two stage ejector as a pre-stage of the water ring vacuum pump
Slovak University of Technology, Faculty of M.E., Institute of Energy Machinery, Námestie Slobody 17, 812 31 Bratislava, Slovakia
* e-mail: robert.olsiak@stuba.sk
Received:
25
March
2019
Accepted:
5
October
2019
A 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. 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. This system has also the function of a cavitation protection due to the higher pressure present at the suction throat of the vacuum pump. A part of this paper is devoted to the governing equations used at the definition of the flow through an ejector. The CFD analysis of the problem was implemented with the package Fluent in 2 dimensions using the axisymmetric approach. The parts of the physical model were printed on a STRATASYS 3D printer, or were cast from technical resin. The experimental studies are then carried out in our own laboratory for validation purposes.
Key words: Two stage ejector / liquid ring vacuum pump / cavitation
© R. Olšiak et al., published by EDP Sciences 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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