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

Author:

Bajic´ Branko1,Keller Andreas2

Affiliation:

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

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

Abstract

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.

Publisher

ASME International

Subject

Mechanical Engineering

Reference4 articles.

1. Abbot, P. A., 1989, “Cavitation Detection Measurements on Francis and Kaplan Hydroturbines,” Proceedings of the International Symposium on Cavitation Noise and Erosion in Fluid Systems, San Francisco, CA, American Society of Mechanical Engineers FED-Vol. 88, pp. 55–61.

2. Bourdon, P., Simoneau, R., Lavagne, P., 1989, “A Vibratory Approach to the Detection of Erosive Cavitation,” Proceedings of the International Symposium on Cavitation Noise and Erosion in Fluid Systems, San Francisco, CA, American Society of Mechanical Engineers, FED-Vol. 88, pp. 103–109.

3. Pearsall, I. S., 1966, “Acoustic Detection of Cavitation,” Symposium on Vibrations in Hydraulic Pumps and Turbines, Manchester, England, Proceedings of Institute of Mechanical Engineers, 1966-67, Vol. 181, Pt 3A, pp. 1–8.

4. Varga J. J. , SebestyenG., and FayA., 1969, “Detection of Cavitation by Acoustic and Vibration-Measurement Methods,” La Houille Blanche, Vol. 24, No. 2, pp. 137–149.

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