Estimation of Cavitation Pit Distributions by Acoustic Emission
Publication: Journal of Hydraulic Engineering
Volume 146, Issue 2
Abstract
Cavitation erosion in hydraulic machinery, such as in turbines and pumps, often leads to significant reduction of the service life of the affected components, with serious consequences for their maintenance costs and operation efficiency. In this study, the potential contribution of acoustic emission (AE) measurements to the assessment of cavitation damage is evaluated from experiments in a cavitation tunnel. Stainless steel samples were exposed to cavitation and damage was characterized from pitting tests carried out on mirror-polished samples. The pits were measured using an optical profilometer and cavitation damage was characterized by pit diameter distribution. In parallel, AE time signal was measured directly from behind the samples. A dedicated signal-processing technique was developed in order to identify each burst in the AE signal and determine its amplitude. The AE amplitude distribution compares well with PVDF and pressure sensor measurements from literature. It is concluded that AE signal analysis can be used to monitor the formation of pits without visual examination of the damaged surface. This provides a basis for possible future applications of nonintrusive cavitation erosion monitoring in hydraulic machines, provided the findings remain true in a more complex environment.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are proprietary or confidential in nature and may only be provided with restrictions (e.g., anonymized data). All data, including the acoustic emission signal and the profilometer data are the propriety of the Tampere University NEM-project. The corresponding author may ask, on request, a permission from the proprietor to provide the data.
Acknowledgments
The authors would like to thank Business Finland, Fortum Power and Heat Oy, Sandvik Mining and Construction Oy, Valtra Oy, and Teollisuuden Voima Oyj and Fortum Foundation for funding the research and for providing technical support.
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Published In
Journal of Hydraulic Engineering
Volume 146 • Issue 2 • February 2020
Copyright
©2019 American Society of Civil Engineers.
History
Received: Nov 28, 2018
Accepted: Jul 10, 2019
Published online: Dec 12, 2019
Published in print: Feb 1, 2020
Discussion open until: May 12, 2020
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