Throttle valves in steam turbines often operate at very small lift positions during turbine startup. The large pressure differentials across these valves, combined with the very small openings at the valve seat, result in large pressure drops across these valves and high local steam Mach numbers. A steam turbine throttle valve operated under these conditions was found to be undergoing self-excited vibration. Stress and structural dynamic finite element analyses (FEA) were performed to identify the structural mode for the valve oscillations. A three-dimensional transient computational fluid dynamics (CFD) analysis of the valve revealed an unsteady fluid dynamics phenomenon in the pressure balancing arrangement that served as a forcing function for this vibration. Valve modifications were implemented as a result of these analyses. The improved valve has performed successfully, and the design modifications have been incorporated in other production valves.
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ASME Turbo Expo 2010: Power for Land, Sea, and Air
June 14–18, 2010
Glasgow, UK
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4402-1
PROCEEDINGS PAPER
Analysis of Fluid-Structure Interaction in a Steam Turbine Throttle Valve
Joseph Tecza,
Joseph Tecza
Dresser-Rand Company, Wellsville, NY
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Randy Moll
Randy Moll
Dresser-Rand Company, Wellsville, NY
Search for other works by this author on:
Joseph Tecza
Dresser-Rand Company, Wellsville, NY
Gocha Chochua
Schlumberger, Sugar Land, TX
Randy Moll
Dresser-Rand Company, Wellsville, NY
Paper No:
GT2010-23788, pp. 2329-2338; 10 pages
Published Online:
December 22, 2010
Citation
Tecza, J, Chochua, G, & Moll, R. "Analysis of Fluid-Structure Interaction in a Steam Turbine Throttle Valve." Proceedings of the ASME Turbo Expo 2010: Power for Land, Sea, and Air. Volume 7: Turbomachinery, Parts A, B, and C. Glasgow, UK. June 14–18, 2010. pp. 2329-2338. ASME. https://doi.org/10.1115/GT2010-23788
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