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WASSERWIRTSCHAFT
Published in: WASSERWIRTSCHAFT 13/2015

01-05-2015 | Hydropower

Cavitation Measurements in Hydraulic Machines by Using Accelerometers

Authors: Markus Eichhorn, Dr. Eduard Doujak, Alfred Schübl

Published in: WASSERWIRTSCHAFT | Issue 13/2015

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Excerpt

Flow acceleration in runners induces a drop of pressure leading to a partly vaporising even at constant temperature, which is called cavitation. The release of steam bubbles results in a two-phase flow, which negatively affects global parameters such as efficiency, torque and head. Further, the sudden implosion of vapour-bubbles in regions of higher pressure causes material erosion, damages on affected component surfaces, vibrations and noise in the hydraulic machinery. Due to the fact that cavitation cannot be avoided completely, special detection methods have to be developed in order to keep negative impacts in an acceptable range. For this reason a monitoring system using piezoelectric accelerometers was developed on a laboratory test rig at the Vienna University of Technology and further applied for prototype measurements. …
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Literature
[1]
Bajic, B.: Multidimensional Diagnostics of Turbine Cavitation. In: Journal of Fluids Engineering 124 (2002).CrossRef
[2]
Bajic, B.: Vibro-Acoustical Diagnostics of Turbine Cavitation. Examples of Application. In: HydroVision, Charlotte, USA, 2000.
[3]
Bajic, B.: Cavitation diagnostics and monitoring. In: International Water Power & Dam Construction (2003).
[4]
Boorsma, A.; Fitzsimmons, P.: Quantification of Cavitation Impacts with Acoustic Emissions Techniques. In: 7th International Symposium on Cavitation. Ann Arbour, USA, 2009.
[5]
Eichhorn, M.: Velocity and Acceleration Measurements on the Casing of Hydraulic Laboratory Models. Diploma Thesis, Institute for Energy Systems and Thermodynamics, 2013.
Metadata
Title
Cavitation Measurements in Hydraulic Machines by Using Accelerometers
Authors
Markus Eichhorn
Dr. Eduard Doujak
Alfred Schübl
Publication date
01-05-2015
Publisher
Springer Fachmedien Wiesbaden
Published in
WASSERWIRTSCHAFT / Issue 13/2015
Print ISSN: 0043-0978
Electronic ISSN: 2192-8762
DOI
https://doi.org/10.1007/s35147-015-0523-1

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