Stability and bifurcation behaviour of a Laval-Rotor considering fluid forces in compliant liquid seals |
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| Authors: | Simon Bäuerle Hartmut Hetzler |
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| Institution: | Engineering Dynamics Group, Institute of Mechanics, University of Kassel, Mönchebergstraße 7, 34125 Kassel – Germany |
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| Abstract: | 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-Hopf or secondary Hopf-Bifurcations can occur depending on the system parameters. (© 2015 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim) |
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