Effect of Tip Skew Coupled Rake on Hydrodynamic Performance of Kappel Propellers
摘要
To explore the effect of tip skew coupled rake on the hydrodynamic performance of Kappel propellers, the fourth-order B-spline method was used to design and change the radial distribution of Kappel propellers in the skew and rake, and an 8-type propeller was constructed. The SST k-ω+γ transition turbulence model, where k denotes the turbulent kinetic energy, ω the specific dissipation rate, and γ the intermittency factor, was employed for simulation, with the Kap509 propeller serving to validate the accuracy of the simulation. The numerical results of the propeller’s open water efficiency are 1.06% to 2.50% lower than the experimental data. It is found that in the vicinity of J=0.8, except for conventional end-plate propellers, the efficiency of the Kap01 series propellers is consistently higher than that of the Kap02 series, with an average increase of 3%. This effect is most pronounced when the skew is 24°, where the efficiency rises by 4.78%. The propeller efficiency increases with the increase of skew when J=0.9-1.0. Under low rake radial distribution, the skew of the propeller can be appropriately improved, which can strengthen the end-plate effect of the Kappel propeller, thereby improving the propulsion performance of the Kappel propeller.