Abstract
In order to analyze the hydrodynamic performance of propeller and ventilation mechanism, based on the Reynolds average Navier-Stokes(RANS) method, the propeller operating near the free surface was simulated using the shear stress transport (SST) k·ω model and the volume of fluid (VOF) method, and the interaction between propeller and free surface and the effect of ventilation on the propeller were analyzed in detail. The results show that the mechanism of ventilation is related to the free surface vortices and tip vortices, and the effect of the free surface vortices and tip vortices is related to the submergence ratios of the propeller. The propeller experiences thrust loss and torque loss due to ventilation, when the distance between the propeller and the free surface is close and the advance coefficient is small, thrust loss and torque loss fluctuate wildly, the mean values of which after stabilization also become small. The irregular deformation of free surface due to ventilation will have a great influence on the performance of propeller.
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