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Acoustic Eigenmodes in the Side Cavities of Centrifugal Compressors

[+] Author Affiliations
Sven König

Siemens AG, Duisburg, Germany

Paper No. GT2009-59650, pp. 547-557; 11 pages
doi:10.1115/GT2009-59650
From:
  • ASME Turbo Expo 2009: Power for Land, Sea, and Air
  • Volume 6: Structures and Dynamics, Parts A and B
  • Orlando, Florida, USA, June 8–12, 2009
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4887-6 | eISBN: 978-0-7918-3849-5
  • Copyright © 2009 by Siemens Energy

abstract

The current paper presents results of an extended research program to gain insight into a better understanding of excitation mechanisms in centrifugal compressors. The focus is on acoustic eigenmodes in the respective side cavities. If those eigenmodes are excited, the resonances may lead to high levels of noise, and, more importantly, vibration amplitudes which may, under certain conditions, ultimately lead to machine failures. Modeling issues arise from the correct modeling of the boundary conditions and a possible mode coupling with connecting cavities. Those issues have been addressed by evaluating different computational domains. By means of finite element analysis it could be shown that a large variety of acoustic modes establishes in the side cavities — some of them with frequencies and mode orders in a frequency range relevant for impeller excitation. For the calculated frequency range it was found that the modes in the hub and shroud side cavities are fully coupled, leading to eigenfrequencies well away from the eigenfrequencies of the local cavity modes.

Copyright © 2009 by Siemens Energy

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