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International Journal of Rotating Machinery
Volume 2017 (2017), Article ID 4120862, 12 pages
https://doi.org/10.1155/2017/4120862
Research Article

Active Flow Control in a Radial Vaned Diffuser for Surge Margin Improvement: A Multislot Suction Strategy

1Department of Mechanical Engineering, Université de Sherbrooke, Sherbrooke, QC, Canada J1K 2R1
2LMFA, Ecole Centrale de Lyon, 36 Avenue Guy de Collongue, 69134 Ecully, France
3Safran Helicopter Engines, Avenue Joseph Szydlowski, 64510 Bordes, France

Correspondence should be addressed to Aurélien Marsan; ac.ekoorbrehsu@nasram.neilerua

Received 31 January 2017; Accepted 9 April 2017; Published 9 May 2017

Academic Editor: Yutaka Ohta

Copyright © 2017 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

This work is the final step of a research project that aims at evaluating the possibility of delaying the surge of a centrifugal compressor stage using a boundary-layer suction technique. It is based on Reynolds-Averaged Navier-Stokes numerical simulations. Boundary-layer suction is applied within the radial vaned diffuser. Previous work has shown the necessity to take into account the unsteady behavior of the flow when designing the active flow control technique. In this paper, a multislot strategy is designed according to the characteristics of the unsteady pressure field. Its implementation results in a significant increase of the stable operating range predicted by the unsteady RANS numerical model. A hub-corner separation still exists further downstream in the diffuser passage but does not compromise the stability of the compressor stage.