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http://dx.doi.org/10.7837/kosomes.2016.22.1.123

A Study on the Hydrodynamic Effect of Biofouling on Marine Propeller  

Seo, Kwang-Cheol (Department of Naval Architecture and Ocean Engineering, Mokop National Maritime University)
Atlar, Mehmet (Emerson Cavitation Tunnel, School of Marine Science and Technology, Newcastle University)
Goo, Bonguk (Department of Naval Architecture and Marine Engineering, Changwon National University)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.22, no.1, 2016 , pp. 123-128 More about this Journal
Abstract
The effect of propeller surface roughness condition on ship performance is very significant even the influence of fouling on propeller performance is not well established compared to biofouling on the hull surface. In present study, predictions of open water efficiency of propeller are made for three different fouling conditions, and its application is given for the 7m full-scale propeller of a medium-size tanker in open water condition. The numerical predictions of propeller efficiency loss due to fouling are based on the results from laboratory-scale drag measurements and boundary layer similarity law analysis presented in Schultz (2007) together with an in-house unsteady lifting surface code which is an appropriate tool to predict the effect of propeller surface roughness on propeller performance. The results of this study indicate that the subject propeller with the small calcareous fouling ($k_s=0.001$) can lead to as high as 15 % loss at the propeller operating condition (J=0.5) and the loss of propeller efficiency due to fouling should be evaluated while the ship is operating.
Keywords
Ship performance; Biofouling; Surface roughness; Open water efficiency; Boundary layer;
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