Abstract
Based on the enlightenment of contra-rotating propellers (CRP) and propeller boss cap fins (PBCF), a numerical study of the contra-rotating propeller boss cap fins (CRPBCF) is carried out by using the STAR-CCM + software and the large eddy simulation (LES) model. The geometric model of the auxiliary propeller is obtained by transforming the blades of the propeller VP1304. To simulate the phenomenon of vortex cavitation as accurately as possible, local mesh refinement is performed in the region, where cavitation may occur. The effects of the CRPBCF on the open water characteristics and cavitation behaviors of marine propellers are analyzed. The numerical results show that the propulsive efficiency of the propeller can be significantly improved by setting an appropriate rotation rate of the auxiliary propeller. Another advantage of the CRPBCF is that it can suppress the generation of hub vortex cavitation (HVC). In addition, the reasons for the advantages of the CRPBCF are analyzed from the pressure distribution and velocity distribution in the wake of the hub.
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