Numerical predictions of the forced vibration of a disk assembly including frictional effects between the shrouds are presented concerning engineering needs for the blade design process. Assuming a tuned disk assembly, numerical static, free, and then forced vibration analyses of a shrouded turbine blade measured in the spin pit are performed systematically. For the excitation forces of an air jet evaluated from the fairly linear behavior of the experimental blade resonance peaks, the reliability of the proposed approach is validated through the very close agreement of the computed and measured resonant peaks. These resonant peaks demonstrate either a fairly linear behavior or a nonlinear one like the jump effect of blade resonance amplitudes, or elastic impacts between the shrouds. Also, the damping performance for different contact configurations between the shrouds is numerically analyzed. These numerical results indicate that the shrouds generate higher frictional damping for small angles between the circumferential direction and the normal vector to the contact surface.
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January 2008
Research Papers
On Nonlinear Forced Vibration of Shrouded Turbine Blades
J. Szwedowicz,
J. Szwedowicz
Thermal Machinery Laboratory,
szwedowicz@ch.abb.com
ABB Turbo Systems Ltd.
, Bruggerstreet 71a, CH-5401 Baden, Switzerland
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R. Visser,
R. Visser
Faculty of Mechanical Engineering,
University of Twente
, 7500 AE Enschede, The Netherlands
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W. Sextro,
W. Sextro
Institute of Mechanics,
Graz University of Technology
, Kopernikusgasse 24/III, A-8010 Graz, Austria
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P. A. Masserey
P. A. Masserey
TSDMH Department,
ALSTOM (Switzerland) Ltd.
, Brown Boveri Street 7, CH-5401 Baden, Switzerland
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J. Szwedowicz
Thermal Machinery Laboratory,
ABB Turbo Systems Ltd.
, Bruggerstreet 71a, CH-5401 Baden, Switzerlandszwedowicz@ch.abb.com
R. Visser
Faculty of Mechanical Engineering,
University of Twente
, 7500 AE Enschede, The Netherlands
W. Sextro
Institute of Mechanics,
Graz University of Technology
, Kopernikusgasse 24/III, A-8010 Graz, Austria
P. A. Masserey
TSDMH Department,
ALSTOM (Switzerland) Ltd.
, Brown Boveri Street 7, CH-5401 Baden, SwitzerlandJ. Turbomach. Jan 2008, 130(1): 011002 (9 pages)
Published Online: December 14, 2007
Article history
Received:
February 27, 2004
Revised:
March 9, 2006
Published:
December 14, 2007
Citation
Szwedowicz, J., Visser, R., Sextro, W., and Masserey, P. A. (December 14, 2007). "On Nonlinear Forced Vibration of Shrouded Turbine Blades." ASME. J. Turbomach. January 2008; 130(1): 011002. https://doi.org/10.1115/1.2218889
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