Preprint Article Version 1 NOT YET PEER-REVIEWED

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

  1. CNR-INSEAN, Marine Technology Research Institute, Via di Vallerano 139, 00128 Rome, Italy
Version 1 : Received: 28 August 2016 / Approved: 29 August 2016 / Online: 29 August 2016 (10:51:08 CEST)
Version 2 : Received: 3 September 2016 / Approved: 5 September 2016 / Online: 5 September 2016 (09:37:05 CEST)

A peer-reviewed article of this Preprint also exists.

Alves Pereira, F.; Di Felice, F.; Salvatore, F. Propeller Cavitation in Non-Uniform Flow and Correlation with the Near Pressure Field. J. Mar. Sci. Eng. 2016, 4, 70. Alves Pereira, F.; Di Felice, F.; Salvatore, F. Propeller Cavitation in Non-Uniform Flow and Correlation with the Near Pressure Field. J. Mar. Sci. Eng. 2016, 4, 70.

Journal reference: J. Mar. Sci. Eng. 2016, 4, 70
DOI: 10.3390/jmse4040070

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 simple harmonic analysis of the pressure data and image processing techniques that allow to retrieve 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 upon the Rayleigh collapse time. Finally, we design a model to predict the cavitation-induced pressure fluctuations from the derivation of the cavitation volume acceleration. This simple model demonstrates a remarkable agreement with the actual pressure field.

Subject Areas

propeller; cavitation pattern; unsteady cavitation; induced pressure fluctuations; high-speed visualization; volume acceleration; cavitation-pressure correlations

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