Cavitation erosion risk assessment on a full-scale steerable thruster

Journal article (2022)

Authors

Themistoklis Melissaris Wärtsilä Netherlands BV, Ship Hydromechanics and Structures - Mechanical, Maritime and Materials Engineering

S. Schenke Ship Hydromechanics and Structures - Mechanical, Maritime and Materials Engineering

Norbert Bulten Wärtsilä Netherlands BV

T.J.C. van Terwisga Ship Hydromechanics and Structures - Mechanical, Maritime and Materials Engineering , Maritime Research Institute Netherlands (MARIN)

Research Group

Ship Hydromechanics and Structures (Mechanical, Maritime and Materials Engineering) (TU Delft)

DOI: https://doi.org/10.1016/j.oceaneng.2022.111019

URANS Cavitation erosion Blade accumulated energy Energy projection Steerable thruster Surface impact distribution

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Published Date

2022

Language

English

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Faculty

Mechanical, Maritime and Materials Engineering

Department

Marine and Transport Technology

Research Group

Ship Hydromechanics and Structures

Abstract

Propeller cavitation erosion prediction at an early design stage is becoming more and more important since it is one of the key constraints in the search for maximum propeller efficiency. Despite the experience from model tests, cavitation erosion research on actual ship scale is very limited. In this study, an attempt is made to assess the erosion risk on the blades of a full-scale steerable thruster of a tug boat. Pressure side cavitation was detected on board for three different propeller designs. For the first time, a cavitation erosion analysis is performed on ship-scale, using a rigorous potential energy approach, which accounts for the focusing of the potential energy at the collapse center during the cavity collapse. A full sensitivity study has been performed for the blade surface accumulated energy. The erosion model shows the erosion risk for different propeller designs applied on the vessel, and different operating conditions, by looking at the surface specific energy on the blade. The erosion analysis shows locations of high erosion risk that show a good resemblance with the actual damage locations on the real blades.

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