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J. Mar. Sci. Eng. 2018, 6(2), 49; https://doi.org/10.3390/jmse6020049

A Semi-Empirical Prediction Method for Broadband Hull-Pressure Fluctuations and Underwater Radiated Noise by Propeller Tip Vortex Cavitation

Maritime Research Institute Netherlands (MARIN), Haagsteeg 2, 6708 PM Wageningen, The Netherlands
This article is an extended version of the paper presented at the Fifth International Symposium on Marine Propulsors (SMP’17), Espoo, Finland, 2017.
Received: 27 February 2018 / Revised: 13 April 2018 / Accepted: 26 April 2018 / Published: 2 May 2018
(This article belongs to the Special Issue Marine Propulsors)
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Abstract

A semi-empirical method is presented that predicts broadband hull-pressure fluctuations and underwater radiated noise due to propeller tip vortex cavitation. The method uses a hump-shaped pattern for the spectrum and predicts the centre frequency and level of this hump. The principal parameter is the vortex cavity size, which is predicted by a combination of a boundary element method and a semi-empirical vortex model. It is shown that such a model is capable of representing the variation of cavity size with cavitation number well. Using a database of model- and full-scale measured hull-pressure data, an empirical formulation for the maximum level and centre frequency has been developed that is a function of, among other parameters, the cavity size. Acceptable results are obtained when comparing predicted and measured hull-pressure and radiated noise spectra for various cases. The comparison also shows differences that require adjustments of parameters that need to be further investigated. View Full-Text
Keywords: propeller; cavitation; tip vortex; hull pressures; underwater radiated noise propeller; cavitation; tip vortex; hull pressures; underwater radiated noise
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Bosschers, J. A Semi-Empirical Prediction Method for Broadband Hull-Pressure Fluctuations and Underwater Radiated Noise by Propeller Tip Vortex Cavitation . J. Mar. Sci. Eng. 2018, 6, 49.

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