Abstract
This study is a parametric investigation of the application of a compact type of pre-swirl duct for a slender aft-body 158k crude oil carrier. The International Maritime Organization (IMO) has created the Energy Efficiency Design Index (EEDI), which is an index related to carbon dioxide emissions, to enforce regulations on newly built ships; many solutions have been proposed, including an increase in propulsion efficiency. In the present study, a new type of energy-saving device (pre-swirl duct), the so-called ring stator, is proposed for 158k crude oil carriers, the hull form of which has been developed as a slender after-body full form to reduce the resistance by delaying separation. A conventional pre-swirl duct is no longer effective at the slender aft-body hull forms because of the small radial flow to the propeller. A parametric study was conducted through Computational Fluid Dynamics (CFD) analysis using the commercial program Star-CCM+, and an improvement of approximately 3% in the propulsion efficiency was achieved in the present study. The efficiency gain was validated through a comparison with the experimental results. The developed ring stator may become applicable to container ships through further parametric studies in the near future.
Highlights
Interest in fossil energy depletion and global warming has increased in recent years.The International Maritime Organization (IMO) has applied the Energy Efficiency DesignIndex (EEDI) to ships built since 2013
Fluid Dynamics (CFD) analysis using the commercial program Star-CCM+, and an improvement of approximately 3% in the propulsion efficiency was achieved in the present study
The Efficiency Design Index (EEDI) represents the amount of carbon dioxide emitted during the transportation of 1 ton of cargo per mile
Summary
Interest in fossil energy depletion and global warming has increased in recent years.The International Maritime Organization (IMO) has applied the Energy Efficiency DesignIndex (EEDI) to ships built since 2013. 2013, gradually increasing to a 50% reduction compared to 2008, and eventually leading to zero emission. The EEDI does not effectively assess a realistic improvement of measures for increasing the ship operating energy efficiency, as while they can be quite effective in the considered operating point for the EEDI, their performance greatly varies in the real operating conditions [2]. For this reason, energy efficiency regulations are being studied a lot. Ancic et al [2] studied improving energy efficiency regulations of bulk carriers, and
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
