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Stability Characteristics of Steam Turbine Rotor Seal System With Analytical Floating Ring Seal Force Model

[+] Author Affiliations
Guang-hui Zhang, Zhan-sheng Liu, Rui-xian Ma

Harbin Institute of Technology, Harbin, Hei Longjiang, China

Gui-long Wang

Shanghai Marine Equipment Research, Shanghai, China

Paper No. GT2013-94118, pp. V07BT30A004; 9 pages
doi:10.1115/GT2013-94118
From:
  • ASME Turbo Expo 2013: Turbine Technical Conference and Exposition
  • Volume 7B: Structures and Dynamics
  • San Antonio, Texas, USA, June 3–7, 2013
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5527-0
  • Copyright © 2013 by ASME

abstract

The analytical oil film force model for floating ring seal is established including the effect of axial pressure gradient. The analytical model is based on the oil lubricated Reynolds equation and the short bearing assumption, where the fluid Lomakin effect is considered. The pressure distribution of the floating ring and static characteristics is studied by numerical simulation. The three dimensional flow model is established and solved by the CFD method. By employing the finite element method, the dynamic model of the floating ring seal-steam turbine rotor system is established. The critical speed, mode shape and dynamic response of the steam turbine rotor with different bearing support stiffness are obtained. The effect of the floating ring oil film force on the critical speed and instability speed with different bearing support stiffness is studied. The effects of floating ring parameters (groove geometrical dimensions) on dynamic response are studied, and the stability of floating ring seal-rotor system with variation of the factor is analyzed. The floating ring seal can play the role of increasing the supporting effect, which will increase the critical speed of the rotor system. The floating ring seal can cause the sub synchronous vibration and the groove can significantly increase the stability of system.

Copyright © 2013 by ASME

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