Classification of Cavitation in Hydraulic Machines using Vibration Analysis

This paper describes vibration analysis techniques that have been adapted and used to classify cavitation in a model Francis turbine. This analysis can be used to compliment standard cavitation tests. Cavitation can be classified in various ways using vibration analysis. Cavitation attached to the blades of the runner is modulated by instabilities caused by the interaction with the blades and the guide vanes, as well as by the outlet swirl. The shape of this modulation is not sinusoidal. Cavitation on the runner is non-uniform; i.e. some blades are, on average, experiencing more aggressive cavitation than others are. Analysis techniques employed include a demodulation technique that considers the envelope auto-power spectrum, joint time-frequency analysis and phase averaging.


Published in:
Proceedings of the 21st IAHR Symposium on Hydraulic Machinery and Systems, Lausanne, Switzerland, 1, 475-482
Presented at:
21st IAHR Symposium on Hydraulic Machinery and Systems, Lausanne, Switzerland, September 9 -12, 2002
Year:
2002
Publisher:
International Association For Hydraulic Research
Note:
Using Smart Source Parsing 9-12 September pp 3
Laboratories:


Note: The status of this file is: EPFL only


 Record created 2005-11-04, last modified 2018-05-08

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