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Journal ArticleDOI

A Study on the Performance Comparison of Energy Saving Devices for Handy-size Bulk Carrier

31 Jan 2015-Journal of the Korean Society of Marine Engineering (Korean Society of Marine Engineers)-Vol. 39, Iss: 1, pp 1-7
About: This article is published in Journal of the Korean Society of Marine Engineering.The article was published on 2015-01-31 and is currently open access. It has received 2 citations till now.

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Summary

  • The environmental regulations for CO2 emissions from the ship have been established recently, and fuel oil price has been increased continuously.
  • In order to overcome these circumstances, Energy Saving Devices (ESDs) have been developed continuously to reduce the fuel oil consumption and improve the propulsive efficiency.
  • This paper describes the trial performance of PBCF (Propeller Boss Cap Fins), SCHNEEKLUTH duct, Asymmetric rudder bulb and Mewis duct applied to handy-size bulk carriers.
  • As a result, SCHNEEKLUTH duct is more effective than other energy saving devices at the reducing the fuel oil consumption and the improvement of the propulsive efficiency.
  • And the fuel oil consumption can also be reduced through main engine de-rating.

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Journal ArticleDOI
25 Feb 2016
TL;DR: In this paper, the dynamic performance of a large floating wave-offshore hybrid power generation platform in extreme conditions was evaluated by measuring motion responses in regular waves and complicated environmental conditions including wave, wind, and current.
Abstract: The present study experimentally considers dynamic performance of large floating wave-offshore hybrid power generation platform in extreme conditions. In order to evaluate the motion performance of the large floating hybrid power generation platform, 1/50 scaled model was manufactured. A mooring line was also manufactured, and free-decay and static pull-out tests were carried out to check the mooring model. A mooring line table was introduced to satisfy the water depth, and environmental conditions were checked. Motion responses in regular waves were measured and complicated environmental conditions including wave, wind, and current were applied to see the dynamic performance in extreme/survival conditions. Maximum motion and acceleration were judged following the design criteria, and maximum offset and mooring tension were also checked based on the rule. The characteristics of hybrid power generation platform are discussed based on these data.

7 citations

Journal ArticleDOI
09 Jul 2021
TL;DR: In this paper, the efficiency of PBCF installed at a bulk carrier was estimated under both Propeller Open Water (POW) and self-propulsion conditions through Computational Fluid Dynamics (CFDs) simulation.
Abstract: In this paper, the efficiency of Propeller Boss Cap Fins (PBCF) installed at the bulk carrier was estimated under both Propeller Open Water (POW) and self-propulsion conditions. For this estimation, virtual model-basin tests (resistance, POW, and self-propulsion tests) were conducted through Computational Fluid Dynamics (CFDs) simulation. In the resistance test, the total resistance and the wake distribution according to ship speed were investigated. In the POW test, changes of thrust, torque coefficient, and open water efficiency on the propeller according to PBCF installation were investigated. Finally, the International Towing Tank Conference (ITTC) 1978 method was used to predict the effect of PBCF installation on self-propulsive coefficient and brake horsepower. For analyzing incompressible viscous flow field, the Reynolds-Averaged Navier–Stokes (RANS) equation with SST k-ω turbulence model was calculated using Star-CCM+ 11.06.010-R8. All simulation results were validated by comparing the results of model tests conducted at the Korea Research Institute of Ships and Ocean Engineering (KRISO). Consequently, for the self-propulsion test with the PBCF, a 1.5% reduction of brake horsepower was estimated in the simulation and a 0.5% reduction of the brake horsepower was estimated in the experiment.

2 citations

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This paper describes the trial performance of PBCF ( Propeller Boss Cap Fins ), SCHNEEKLUTH duct, Asymmetric rudder bulb and Mewis duct applied to handy-size bulk carriers.