Abstract
When a planing boat sails at the free surface, the posture changes drastically with time, so the surface piercing propellers usually work in oblique flow. In this paper, numerical simulations are performed to predict the performance of PSP-841B with Unsteady Reynolds Averaged Navier–Stokes (URANS) method coupling with sliding mesh and volume of fluid (VOF) method. The results show that the predicted thrust and torque coefficients of PSP-841B are in good agreement with the experimental data. It proves the present numerical schemes are feasible and validated. These schemes are applied in the simulations of SPP-1 that is installed to a planing craft. In oblique flow, the ventilation volume of SPP-1 increases dramatically, resulting in the postponed transition of vented status that changes from the fully dry to partially wetted; at the low advance ratios, the thrust and torque coefficients are less than that in the horizontal case. As the advance speed increases, the vented mode of SPP-1 varies from full ventilation to partially wet, and the forces and moments get closer to the results in the horizontal flow. In addition, the blockage effect of air cavity to the inflow in oblique flow is more significant than the results in the horizontal case.
Highlights
Surface piercing propellers (SPPs) are increasing in popularity for high-speed crafts
Both conditions are selected to analyze the hydrodynamic characteristics of SPP-1 in horizontal and oblique flow, in which the inclination angles are 0 and 7, respectively
The same numerical schemes are employed to simulate the hydrodynamic performance of SPP-1 in oblique
Summary
Surface piercing propellers (SPPs) are increasing in popularity for high-speed crafts. Surface piercing propellers have higher propulsive efficiency. Since the appendages such as shaft and bracket are above the free surface, the appendage resistances are reduced dramatically [1,2]. Surface piercing propellers operate near the free surface, which causes the amount of air to be sucked into the water and the cavitation generation to be inhibited. The floating conditions of planing crafts vary greatly when it comes to higher speeds, especially the large pitch. Under these situations, the surface piercing propellers usually operate in oblique flow
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