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Stability and bifurcation behaviour of a Laval‐Rotor considering fluid forces in compliant liquid seals
Author(s) -
Bäuerle Simon,
Hetzler Hartmut
Publication year - 2015
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201510111
Subject(s) - hopf bifurcation , seal (emblem) , rotor (electric) , mechanics , bifurcation , critical speed , work (physics) , engineering , control theory (sociology) , physics , mechanical engineering , nonlinear system , computer science , art , visual arts , control (management) , quantum mechanics , artificial intelligence
This contribution discusses the influence of fluid forces, stemming from compliant, contact‐free annular rotor seals, on the steady state stability and bifurcation behaviour of a rotor. The model used in this work consists of a Laval‐Rotor where the disc runs in a turbulently streamed seal. The compliance of the seal is reduced to a visco‐elastically supported outer seal ring. In order to account for the fluid seal forces the Childs‐Hirs‐model is used. An investigation of the eigenvalues shows that the compliance of the seal support may lead to a significant increase in the stable operating range. A stability‐loss via Hopf‐ , Hopf‐Hop f or secondary Hopf‐ Bifurcations can occur depending on the system parameters. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)