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Citation:
　Yanuar,Gunawan,Sunaryo and A. Jamaluddin.Micro-bubble Drag Reduction on a High Speed Vessel Model[J].Journal of Marine Science and Application,2012,(3):301-304.[doi:10.1007/s11804-012-1136-z]
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Micro-bubble Drag Reduction on a High Speed Vessel Model

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Title:
Micro-bubble Drag Reduction on a High Speed Vessel Model
Author(s):
Yanuar;  Gunawan;  Sunaryo and A. Jamaluddin
Affilations:
Author(s):
Yanuar;  Gunawan;  Sunaryo and A. Jamaluddin
1. Department of Mechanical Engineering, University of Indonesia, Jakarta 16424, Indonesia 2. Indonesian Hydrodynamic Laboratory, Surabaya 60111, Indonesia
Keywords:
ship model test;  micro-bubble injection;  drag reduction;  high speed vessel model
分类号:
-
DOI:
10.1007/s11804-012-1136-z
Abstract:
Ship hull form of the underwater area strongly influences the resistance of the ship. The major factor in ship resistance is skin friction resistance. Bulbous bows, polymer paint, water repellent paint (highly water-repellent wall), air injection, and specific roughness have been used by researchers as an attempt to obtain the resistance reduction and operation efficiency of ships. Micro-bubble injection is a promising technique for lowering frictional resistance. The injected air bubbles are supposed to somehow modify the energy inside the turbulent boundary layer and thereby lower the skin friction. The purpose of this study was to identify the effect of injected micro bubbles on a navy fast patrol boat (FPB) 57 m type model with the following main dimensions: L=2 450 mm, B=400 mm, and T=190 mm. The influence of the location of micro bubble injection and bubble velocity was also investigated. The ship model was pulled by an electric motor whose speed could be varied and adjusted. The ship model resistance was precisely measured by a load cell transducer. Comparison of ship resistance with and without micro-bubble injection was shown on a graph as a function of the drag coefficient and Froude number. It was shown that micro bubble injection behind the mid-ship is the best location to achieve the most effective drag reduction, and the drag reduction caused by the micro-bubbles can reach 6%–9%.

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Memo

Memo:
Supported by the Directorate for Research and Community Service, University of Indonesia (RUUI Research Laboratory 2010), Jakarta, Indonesia.
Last Update: 2012-09-05