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Article

Analysis of a Linear Model for Non-Synchronous Vibrations Near Stall

1
Ecole Centrale de Lyon, Universite de Lyon, CNRS, Universite Claude Bernard Lyon 1, INSA Lyon, LMFA, UMR 5509, F-69134 Ecully, France
2
Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, UK
*
Author to whom correspondence should be addressed.
This paper is an extended version of our paper published in the Proceedings of the 14th European Turbomachinery Conference, Gdansk, Poland, 12–16 April 2021.
These authors contributed equally to this work.
Academic Editor: Antoine Dazin
Int. J. Turbomach. Propuls. Power 2021, 6(3), 26; https://doi.org/10.3390/ijtpp6030026
Received: 30 June 2021 / Revised: 6 July 2021 / Accepted: 6 July 2021 / Published: 9 July 2021
Non-synchronous vibrations arising near the stall boundary of compressors are a recurring and potentially safety-critical problem in modern aero-engines. Recent numerical and experimental investigations have shown that these vibrations are caused by the lock-in of circumferentially convected aerodynamic disturbances and structural vibration modes, and that it is possible to predict unstable vibration modes using coupled linear models. This paper aims to further investigate non-synchronous vibrations by casting a reduced model for NSV in the frequency domain and analysing stability for a range of parameters. It is shown how, and why, under certain conditions linear models are able to capture a phenomenon, which has traditionally been associated with aerodynamic non-linearities. The formulation clearly highlights the differences between convective non-synchronous vibrations and flutter and identifies the modifications necessary to make quantitative predictions. View Full-Text
Keywords: non-synchronous vibration; flutter; aeroelastic instability; compressor non-synchronous vibration; flutter; aeroelastic instability; compressor
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MDPI and ACS Style

Brandstetter, C.; Stapelfeldt, S. Analysis of a Linear Model for Non-Synchronous Vibrations Near Stall. Int. J. Turbomach. Propuls. Power 2021, 6, 26. https://doi.org/10.3390/ijtpp6030026

AMA Style

Brandstetter C, Stapelfeldt S. Analysis of a Linear Model for Non-Synchronous Vibrations Near Stall. International Journal of Turbomachinery, Propulsion and Power. 2021; 6(3):26. https://doi.org/10.3390/ijtpp6030026

Chicago/Turabian Style

Brandstetter, Christoph, and Sina Stapelfeldt. 2021. "Analysis of a Linear Model for Non-Synchronous Vibrations Near Stall" International Journal of Turbomachinery, Propulsion and Power 6, no. 3: 26. https://doi.org/10.3390/ijtpp6030026

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