Hydrodynamic Characteristics of a Surface Piercing Propeller Entering Water with Different Radiuses

Abstract

In order to investigate the influence of a dimensionless section position of a surface piercing propeller on the hydrodynamic characteristics of the surface piercing propeller cup section, the cup section of the surface piercing propeller at the dimensionless radius of 0.6, 0.7, and 0.8 is selected for modeling. By solving the RANS equation to simulate the cup section entry process, in combination with the volume of fluid method and the overlapping grid technique, a reliable numerical method is established. The hydrodynamic characteristics of the water entry process of the surface piercing propeller cup section at different section positions are studied. The effects of different section positions on the free surface form, ventilation cavity form, flow field, and the surface pressure distribution in the water entry process of the surface piercing propeller cup section are analyzed. The results show that with the position of the dimensionless radius section getting closer to the tip of the surface piercing propeller, the transition state between the fully ventilated state and the partially ventilated state occurs at a larger speed coefficient, and the transverse force coefficient and the open water efficiency increases.

Keywords

• surface piercing propeller
• cup section
• dimensionless radius
• ventilation phenomenon
• hydrodynamic characteristics
• numerical simulation