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

Bousquet, Yannick and Carbonneau, Xavier and Trébinjac, Isabelle and Binder, Nicolas and Dufour, Guillaume Numerical Investigation of Kelvin-Helmholtz Instability in a Centrifugal Compressor Operating Near Stall. (2015) In: ASME Turbo Expo 2015, 15 June 2015 - 19 June 2015 (Montreal, Canada).

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Official URL: http://dx.doi.org/10.1115/GT2015-42495

Abstract

The present works details the occurrence of the Kelvin–Helmholtz instability in a centrifugal compressor operating near stall. The analysis are 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 struc- ture 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 sec- ondary 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:Conference or Workshop Item (Paper)
Additional Information:ISBN: 978-0-7918-5665-9
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Other partners > Université de Lyon - UDL (FRANCE)
Laboratory name:
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Deposited By: Bousquet Yannick
Deposited On:21 Mar 2018 11:41

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