MATEC Web Conf.
Volume 133, 2017BulTrans-2017 – 9th International Scientific Conference on Aeronautics, Automotive and Railway Engineering and Technologies
|Number of page(s)||5|
|Section||Internal Combustion Engines|
|Published online||07 November 2017|
Pre-swirl mechanism in front of a centrifugal compressor: effects on surge line and on unsteady phenomena in surge area
1 Conservatoire National des Arts et Métiers, Laboratoire de Chimie Moléculaire, Génie des Procédés Chimiques et Energétique (CMGPCE – EA7341), 292 Rue Saint Martin, 75003 Paris, France
2 Association Technique Turbine à Gaz (ATTAG), 15 rue Marat, 78210 Saint-Cyr-l’Ecole, France
* Corresponding author: email@example.com
Using a pre-swirl mechanism upstream an impeller of a compressor allows to modify its characteristics curve, while weakly damaging its efficiency. Another consequence of the pre-swirl is to push back the surge line limit and to increase the operation zone towards the low flow rate limits. A centrifugal compressor has been modified in order to add a swirl generator device upstream the impeller. The incidence values of blades can vary from 0° (no pre-swirl) to ±90°. The variation of the stator blades incidence has several main consequences: to allow a flow rate adjustment with a good efficiency conservation, to increase the angular velocity with a constant shaft power, to produce a displacement of the surge line limit. In this paper, the results of experimental studies are presented to analyze the surge line and the intensity of unsteady phenomena when the compressor works in its surge area.
© The Authors, published by EDP Sciences, 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
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