科研之友
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摘要
To analyze the influence of immersion ratios on the hydrodynamic performance of surface piercing propellers under natural ventilation, a reliable numerical method was established. The numerical simulation of the standard 841B model was performed by solving the RANS equation and combining it with the VOF method and sliding mesh technique. The hydrodynamic characteristics of an actual surface piercing propeller (SPP-1) at different immersions were investigated using this method. The open water performance, force pulsation, and wake flow field characteristics of SPP-1 under different immersions were analyzed. The results showed that the ventilation states of SSP-1 were closely related to the immersion ratio and advance speed coefficient. When the SSP-1 was not fully immersed, the thrust and torque first increased and then decreased along with the increase in the advance speed coefficient. Under the fully immersion condition, the change in trends of the hydrodynamic coefficients was similar to that of conventional propellers. The immersion depth and ventilation states had great influence on the pulsation characteristics of the forces/moments of SSP-1. The wake flow field was more uniform as the immersion depth increased, whereas the velocity distribution in the wake flow field mutated in the free surface.
