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International Journal of Rotating Machinery
Volume 2012, Article ID 549048, 12 pages
http://dx.doi.org/10.1155/2012/549048
Research Article

Study and Control of a Radial Vaned Diffuser Stall

1Turbomeca, Safran Group, BP 17, 64511 Bordes Cedex, France
2LMFA, UMR 5509, Ecole Centrale de Lyon, UCB Lyon I and INSA, 69134 Ecully Cedex, France

Received 20 July 2012; Accepted 29 October 2012

Academic Editor: Seyed G. Saddoughi

Copyright © 2012 Aurélien Marsan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The aim of the present study is to evaluate the efficiency of a boundary layer suction technique in case of a centrifugal compressor stage in order to extend its stable operating range. First, an analysis of the flow pattern within the radial vaned diffuser is presented. It highlights the stall of the diffuser vanes when reaching a low massflow. A boundary layer separation in the hub-suction side corner grows when decreasing the massflow from the nominal operating point to the surge and finally leads to a massive stall. An aspiration strategy is investigated in order to control the stall. The suction slot is put in the vicinity of the saddle that originates the main separating skin-friction line, identified thanks to the analysis of the skin-friction pattern. Several aspiration massflow rates are tested, and two different modelings of the aspiration are evaluated. Finally, an efficient control is reached with a removal of only 0,1% of the global massflow and leads—from a steady-state calculations point of view—to an increase by 40% of the compressor operating range extent.