A 46 MW 5500 rpm multistage single casing utility steam turbine experienced strong subsynchronous rotordynamic vibration of the first rotor mode; preventing full load operation of the unit. The root cause of the vibration stemmed from steam whirl forces generated at secondary sealing locations in combination with a flexible rotor-bearing system. Several attempts were made to eliminate the subsynchronous vibration by modifying bearing geometry and clearances, which came short of enabling full load operation. The following paper presents experimental tests and analytical results focused on stabilizing a 46 MW 6230 kg utility steam turbine experiencing subsynchronous rotordynamic instability. The paper advances an integral squeeze film damper (ISFD) solution, which was implemented to resolve the subsynchronous vibration and allow full load and full speed operation of the machine. The present work addresses the bearing-damper analysis, rotordynamic analysis, and experimental validation through waterfall plots, and synchronous vibration data of the steam turbine rotor. Analytical and experimental results show that using ISFD improved the stability margin by a factor of 12 eliminating the subsynchronous instability and significantly reducing critical speed amplification factors. Additionally, by using ISFD the analysis showed significant reduction in interstage clearance closures during critical speed transitions in comparison to the hard mounted tilting pad bearing configuration.
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Stabilizing a 46 MW Multistage Utility Steam Turbine Using Integral Squeeze Film Bearing Support Dampers
Bugra Ertas,
Bugra Ertas
1
Mechanical Systems Organization,
GE Global Research Center
,Niskayuna, NY 12309
1Corresponding author.
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Vaclav Cerny,
Vaclav Cerny
Head of Operational Analysis,
Doosan Skoda Power
,Pizen 30614
, Czech Republic
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Jongsoo Kim,
Jongsoo Kim
Engineering and Research,
Waukesha Bearings Corporation
,Pewaukee, WI 53072
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Vaclav Polreich
Vaclav Polreich
Measurement and Diagnostics,
Doosan Skoda Power
,Pizen 30614
, Czech Republic
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Bugra Ertas
Mechanical Systems Organization,
GE Global Research Center
,Niskayuna, NY 12309
Vaclav Cerny
Head of Operational Analysis,
Doosan Skoda Power
,Pizen 30614
, Czech Republic
Jongsoo Kim
Engineering and Research,
Waukesha Bearings Corporation
,Pewaukee, WI 53072
Vaclav Polreich
Measurement and Diagnostics,
Doosan Skoda Power
,Pizen 30614
, Czech Republic
1Corresponding author.
Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 9, 2014; final manuscript received August 20, 2014; published online December 2, 2014. Editor: David Wisler.
J. Eng. Gas Turbines Power. May 2015, 137(5): 052506 (11 pages)
Published Online: May 1, 2015
Article history
Received:
July 9, 2014
Revision Received:
August 20, 2014
Online:
December 2, 2014
Citation
Ertas, B., Cerny, V., Kim, J., and Polreich, V. (May 1, 2015). "Stabilizing a 46 MW Multistage Utility Steam Turbine Using Integral Squeeze Film Bearing Support Dampers." ASME. J. Eng. Gas Turbines Power. May 2015; 137(5): 052506. https://doi.org/10.1115/1.4028715
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