Propeller Cavitation in Non-Uniform Flow and Correlation with the Near Pressure Field

Alves Pereira, Francisco and Di Felice, Fabio and Salvatore, Francesco (2016) Propeller Cavitation in Non-Uniform Flow and Correlation with the Near Pressure Field. Journal of Marine Science and Engineering, 4 (4). pp. 1-21. ISSN 2077-1312

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Abstract

An experimental study is carried out in a cavitation tunnel on a propeller operating downstream of a non-uniform wake. The goal of this work is to establish quantitative correlations between the near pressure field and the cavitation pattern that takes place on the propeller blades. The pressure field is measured at the walls of the test section and in the near wake of the propeller and is combined with quantitative high-speed image recording of the cavitation pattern. Through harmonic analysis of the pressure data and image processing techniques that allow retrieving the cavitation extension and volume, we discuss the potential sources that generate the pressure fluctuations. Time correlations are unambiguously established between pressure peak fluctuations and cavitation collapse events, based on the Rayleigh collapse time. Finally, we design a model to predict the cavitation-induced pressure fluctuations from the derivation of the cavitation volume acceleration. A remarkable agreement is observed with the actual pressure field.

Item Type: Article
Uncontrolled Keywords: marine propellers; cavitation pattern; unsteady cavitation; induced pressure fluctuations; high-speed visualization; volume acceleration; cavitation-pressure correlations
Subjects: 500 Scienze naturali e Matematica > 530 Fisica > 532 Meccanica dei fluidi; Meccanica dei liquidi (Classificare qui l’Idraulica e l’Idromeccanica) > 532.5 Idrodinamica
Depositing User: Dr Francisco Alves Pereira
Date Deposited: 12 Dec 2016 15:16
Last Modified: 12 Dec 2016 15:22
URI: http://eprints.bice.rm.cnr.it/id/eprint/15559

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