| In recent years,the development trend of ship field is mainly large scale and high speed.With the rapid increase of ship sailing speed,the hydrodynamic performance of conventional propeller can no longer meet the efficiency requirements of medium-high speed ships.In addition,the wake instability caused by the increase of ship speed will reduce the cavitation performance of the propeller,and conventional propeller cannot slow down the cavitation phenomenon.When the propeller cavitation occurs seriously,the propeller blade erosion,the service life of the propeller is shortened,the hydrodynamic performance of the propeller is reduced and the ship’s oscillation pressure is increased.Therefore,more and more attention has been paid to the design and development of medium and high speed ship propellers in the ship field.At present,the research on the performance of the high skew propeller based on the design parameters has gradually become a hot topic in the ship field.In order to study the design parameters on the big side propeller hydrodynamic performance and cavitation,the effect of a STAR-CCM+ simulation software for the experiment platform,first of all,computational fluid dynamics simulation accuracy verification,to Hassan Ghasseni,et al.study of skew propeller as the research object,and grid independence verification experiment and turbulence model for the simulation precision of the contrast experiment,put forward the reasonable meshing method and choose the appropriate turbulence model.By carrying out the hydrodynamic performance simulation experiment,the simulation results were compared with the results of the pool test measured by Hassan Ghasseni et al.,and the accuracy of the simulation experiment was verified.Then,using the principle of single variable and taking the above large oblique propeller as the model propeller,nine large oblique propeller models based on three design parameters are established.Finally,the steady-state calculation and the transient calculation are used to simulate the performance of the three models,and the simulation results of hydrodynamic performance and cavitation performance of the large-sided inclined propeller with different design parameters in the steady and unsteady flow field are calculated.Through the comparison and analysis of the simulation results of the large oblique propeller with different design parameters,it is found that the design parameters will affect the hydrodynamic performance and cavitation performance of the large oblique propeller in different degrees.Simulation software through the STAR-CCM+post-processing function,the simulation data and visual image are analyzed in detail,the results show that with the increase of skew Angle,the hydrodynamic and cavitation performance of propeller are improved,and when the side Angle exceeds a certain threshold,the propulsive efficiency and cavitation rate rise but not fall,and the propeller under surface pressure distribution is changed;With the increase of the disk surface ratio,the hydrodynamic force and cavitation performance of the propeller will be improved,and the force of the propeller blades will be more uniform,but the efficiency will be reduced.With the increase of the trim Angle,the pressure distribution on the blade surface of the propeller changes relatively little,and the hydrodynamic force and cavitation performance of the propeller also change relatively little.Compared with the other two design parameters,its influence on the performance of the propeller can be neglected.In this paper,the influence of design parameters on hydrodynamic performance and cavitation performance of large-sided inclined propeller is studied and discussed,which can provide some referential Suggestions for the design and development of medium-high speed ship propeller. |
