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Spatiotemporal analysis of sheet and cloud cavitation and its damage potential

Hatzissawidis, Grigorios ; Kerres, Lara ; Ludwig, Gerhard J. ; Pelz, Peter F. (2022)
Spatiotemporal analysis of sheet and cloud cavitation and its damage potential.
In: IOP Conference Series: Earth and Environmental Science, 2022, 1079
doi: 10.26083/tuprints-00022519
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Spatiotemporal analysis of sheet and cloud cavitation and its damage potential
Language: English
Date: 19 October 2022
Place of Publication: Darmstadt
Year of primary publication: 2022
Publisher: IOP Publishing
Journal or Publication Title: IOP Conference Series: Earth and Environmental Science
Volume of the journal: 1079
Collation: 12 Seiten
DOI: 10.26083/tuprints-00022519
Corresponding Links:
Origin: Secondary publication DeepGreen

The cavitation regime has a substantial influence on the damage potential, thus it has to be considered in any specific investigation. For this purpose, we set up a test rig at the Technische Universität Darmstadt using a Circular Leading Edge hydrofoil (CLE) to analyse the damage potential of sheet and cloud cavitation. Exceeding a critical Reynolds number Re c, the cavitation regime transitions from harmless sheet cavitation to aggressive cloud cavitation. High-speed recordings of the cavitation regime are correlated with high frequency pressure data from a wall-mounted piezoelectric pressure transducer. Spatial and temporal content of the cavitating flow are captured applying proper orthogonal decomposition (POD) to the high-speed recordings. In order to determine the damage potential of the cavitation regime we apply a copper foil on the hydrofoil surface, on which plastic, crater-shaped deformations due to bubble collapses occur. Images of the surface are recorded before and after each run via two-dimensional Pit-Count microscopy. We correlate spatial modes from the cavitating flow field with the eroded surface rate from pitting tests leading to the result that cloud cavitation associated with increasing cloud size is more aggressive. A power law is identified where pitting rate increases with fourteenth power of the Reynolds number.

Uncontrolled Keywords: cavitation, cavitation erosion, Pit-Count microscopy, high-speed visualisation, modal decomposition
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-225190
Additional Information:

31st IAHR Symposium on Hydraulic Machinery and Systems 26/06/2022 - 01/07/2022 Trondheim, Norway

Classification DDC: 600 Technology, medicine, applied sciences > 620 Engineering and machine engineering
Divisions: 16 Department of Mechanical Engineering > Institute for Fluid Systems (FST) (since 01.10.2006)
Date Deposited: 19 Oct 2022 12:41
Last Modified: 14 Nov 2023 19:05
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/22519
PPN: 500721246
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