In response to the strengthening environmental regulations by the International Maritime Organization (IMO), the development of Energy Saving Devices (ESD) is actively progressing. This study was conducted to design an Eco-Ring Stator (ERS) suitable f...
In response to the strengthening environmental regulations by the International Maritime Organization (IMO), the development of Energy Saving Devices (ESD) is actively progressing. This study was conducted to design an Eco-Ring Stator (ERS) suitable for the Suezmax-class hull form. By comparing and analyzing the wake field in the bare hull condition, the flow characteristics of the wake shape including the hook shape formed by the influence of the bilge vortex were confirmed to be similar, and the vector distribution also appeared consistent with the model test results. Prior to the full-scale ERS design, an asymmetric stator was designed, confirming an efficiency increase of over 3%. For the ERS design, the main design parameters considered were the ring diameter, the number of stator blades, the chord distribution by stator radius, and the pitch angle based on the equivalent angle of attack distribution, all referenced to the Stock ERS. As a result, the propulsion efficiency was improved when an asymmetric stator configuration featuring a chord length that is 5% of the propeller diameter and an equivalent angle of attack of -11° was applied. Ultimately, an efficiency improvement of 5.1% was confirmed compared to the bare hull condition.