Numerical analysis of drag reduction of hydrofoil appendage for high-speed ship

Abstract

ObjectiveIn order to reduce the wave-making resistance of high-speed ships, this paper proposes an innovative hydrofoil appendage with a drag reduction effect. MethodsAn NACA 0012 airfoil is selected for the hydrofoil appendage cross-section, and a series of studies on the drag reduction effects of bow-mounted hydrofoil appendages of different sizes and installation positions is carried out using the numerical calculation method verified by convergence and reliability tests. The drag reduction effect of adding a T-wing to the stern of a ship is further studied. ResultsThe results show that the maximum drag reduction is 7.38% and 6.82% at high speeds of Froude number 0.45 and 0.494 when the hydrofoil appendage is only installed at the bow. The drag is further reduced after adding the T-wing to the stern, and the total drag reduction is 9.35% and 11.13% at high speeds of Froude number 0.45 and 0.494. Conclusions The hydrofoil appendage with a drag reduction effect proposed in this paper greatly reduces the total drag of high-speed ships, improves their speed and provides new technical means for further improving their navigation performance.

Keywords

• high-speed ships
• drag reduction
• bow hydrofoil appendage
• stern t-wing