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Numerical Investigation of Kelvin–Helmholtz Instability in a Centrifugal Compressor Operating Near Stall

Bousquet, Yannick and Binder, Nicolas and Dufour, Guillaume and Carbonneau, Xavier and Trébinjac, Isabelle and Roumeas, Mathieu Numerical Investigation of Kelvin–Helmholtz Instability in a Centrifugal Compressor Operating Near Stall. (2016) Journal of Turbomachinery, vol. 138 (N° 7). pp. 1-9. ISSN 0889-504X

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Official URL: http://dx.doi.org/10.1115/1.4032457

Abstract

The present work details the occurrence of the Kelvin–Helmholtz instability in a centrifugal compressor operating near stall. The analysis is based on unsteady three-dimensional simulations performed on a calculation domain covering the full annulus for the impeller and the vaned diffuser. A detailed investigation of the flow structure is presented, together with its evolution consequent to the mass flow reduction. It is demonstrated that this reduction leads to an enlargement of the low-momentum flow region initially induced by the combination of the secondary and leakage flows. When the compressor operates near stall, the shear layer at the interface between the main flow and this low-momentum flow becomes unstable and induces a periodic vortex shedding. The frequency of such an unsteady phenomenon is not correlated with the blade-passing frequency. Its signature is thus easily isolated from the deterministic rotor/stator interaction. Its detection requires full-annulus simulations with an accurate resolution in time and space, which explains why it has never been previously observed in centrifugal compressors

Item Type:Article
Additional Information:Thanks to ASME editor. The definitive version is available at http://asmedigitalcollection.asme.org The original PDF of the article can be found at Journal of Turbomachinery website: http://turbomachinery.asmedigitalcollection.asme.org/article.aspx?articleid=2481411
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Institut National des Sciences Appliquées de Lyon - INSA (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Other partners > Liebherr Aérospace Toulouse (FRANCE)
Other partners > Université Claude Bernard-Lyon I - UCBL (FRANCE)
Other partners > Ecole Centrale de Lyon (FRANCE)
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Deposited By: Guillaume Dufour
Deposited On:29 Aug 2016 13:00

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