Session: 06-05-02 Marine Hydrodynamics

Submission Number: 155956

Influence of Water Pressure on Bubble Induced Friction Drag Reduction 

As improving vessel fuel consumption efficiency and EEDI index under increasingly tight environmental regulations has emerged as a significant challenge in the industry, the air lubrication system, a ship friction drag reduction technology, is being suggested as one of the solutions. This study investigates the effect of water pressure on the effect of friction drag reduction achieved through air lubrication systems. Perform experimental and CFD calculation analysis to see how different water pressure conditions affect bubble behavior, the surface boundary layer, and the resulting drag reduction rate. According to the results of the study, water pressure significantly affects the bubble dynamics, affecting parameters such as bubble size, behavior, and deployment range. However, as a result, these changes do not significantly change the air density near the surface, nor does the drag reduction efficiency change significantly. However, understanding these effects is critical to optimizing the performance of air lubrication systems under various ship operating drains and pressure conditions, and to provide insights into efficient energy conservation strategies in commercial and industrial marine applications. This result can be utilized to calculate the supplied air flow rate according to ship operating drains more accurately and to apply the air lubrication system to various operating conditions. As a result, it can help the air lubrication system become a more effective and extensive friction resistance reduction solution.

Presenting Author: Chang-Hyeon Kim Hyundai Maritime Research Institute

Presenting Author Biography: - M.Sc., Dep't. of Naval Architecture and Ocean Engineering, University of Ulsan, Korea
- Senior Researcher, Ship performance research dep't., HD Hyundai heavy industries