Analysis on the internal flow and cavitation characteristics of water jet propulsion during the set sail phase
In order to study the internal flow and cavitation characteristics of the waterjet propulsion during the set sail phase,an axial flow water jet propulsion was used as the object of study.Based on Ansys CFX commercial software,the SST k-ω turbulence model and ZGB cavitation model were used to numerically simulate the set sail process of the water jet propulsion.The results show that the waterjet propulsion has a hysteresis effect on the flow rate and head during the set sail phase,and the flow pattern inside the inlet channel is relatively turbulent,with obvious flow separation phenomena.The overall turbulent energy of the waterjet pump increases with the increase of the sailing process time,and is most obvious at the top of the impeller due to the pressure difference between the blade pressure surface and the suction surface to form the top of the impeller leakage vortex.The volume fraction of air bubbles in the impeller increases with the development of the starting process,and the volume fraction of air bubbles in the stable phase after the completion of the starting phase de-creases by 4.2％compared to the highest value,and the serious cavitation inhibits the propulsion efficiency of the waterjet propulsion,and the overall efficiency of the starting phase shows an increase and then a decrease.
water jet propulsionset sailinternal flow performancecavitationnumerical simulation
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NSTL
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