Spectrum Normalization Method in Vibro-Acoustical Diagnostic Measurements of Hydroturbine Cavitation

[+] Author and Article Information
Branko Bajić

Brodarski Institute, Marine Research & Special Technologies, Zagreb, Croatia

Andreas Keller

Obernach Hydraulic Research Laboratory, Munich University of Technology, Obernach, Germany

J. Fluids Eng 118(4), 756-761 (Dec 01, 1996) (6 pages) doi:10.1115/1.2835506 History: Received July 20, 1995; Revised January 02, 1996; Online January 22, 2008


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.

Copyright © 1996 by The American Society of Mechanical Engineers
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