Full-scale vibro-acoustical diagnostic measurements of cavitation in four Francis 6 MW double runner turbines were performed. Two types of sensors were used—a hydrophone sensing waterborne noise at the pressure side of a runner and an accelerometer mounted at various points at the outer turbine casing, facing the runner’s pressure side. The correlation of noise and acceleration intensity with suction-side pressure fluctuations and runner position was checked. A simple but efficient method of spectrum normalization, which rejects the influence of the measurement set characteristics and vibro-acoustical characteristics of a turbine, was developed. The resulting spectra reveal the dependence of cavitation source strength on the turbine power as a function of noise or acceleration frequency.
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December 1996
Research Papers
Spectrum Normalization Method in Vibro-Acoustical Diagnostic Measurements of Hydroturbine Cavitation
Branko Bajic´,
Branko Bajic´
Brodarski Institute, Marine Research & Special Technologies, Zagreb, Croatia
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Andreas Keller
Andreas Keller
Obernach Hydraulic Research Laboratory, Munich University of Technology, Obernach, Germany
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Branko Bajic´
Brodarski Institute, Marine Research & Special Technologies, Zagreb, Croatia
Andreas Keller
Obernach Hydraulic Research Laboratory, Munich University of Technology, Obernach, Germany
J. Fluids Eng. Dec 1996, 118(4): 756-761 (6 pages)
Published Online: December 1, 1996
Article history
Received:
July 20, 1995
Revised:
January 2, 1996
Online:
January 22, 2008
Citation
Bajic´, B., and Keller, A. (December 1, 1996). "Spectrum Normalization Method in Vibro-Acoustical Diagnostic Measurements of Hydroturbine Cavitation." ASME. J. Fluids Eng. December 1996; 118(4): 756–761. https://doi.org/10.1115/1.2835506
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