关键词: 螺旋桨, 导管, 截面厚度, 尾缘收缩率

Abstract: The influence of the duct on the hydrodynamic characteristics of the propeller has been studied based on the Reynolds-Averaged Navier-Stokes (RANS) method with SST k-ω turbulence model. The numerical simulation is carried out on the design schemes of propellers with or without duct, ducts whether rotate coaxially with the propeller, and ducts with different cross-sectional shapes. The differences in the flow field structure and propeller hydrodynamic characteristics are compared and analyzed. The calculation results show that the duct can reduce the net thrust of the propeller with an increase of the total thrust and a decrease of the torque. The torque increases greatly when the duct rotates coaxially with the propeller. The influence of the cross-sectional shape of the duct on the hydrodynamic characteristics of the propeller mainly concentrates on the cross-section thickness and the trailing edge shrinkage. The thickness change leads to the change of the lines of the leading edge, which greatly affects the net thrust, while the trailing edge shrinkage leads to the changes of the lines of the trailing edge, which has little impact on the thrust but increases the torque. The above results preliminarily indicate the influence of the duct on the hydrodynamic characteristics of the propeller. It can provide references for the subsequent design of the ducted propeller.

Key words: propeller, duct, section thickness, trailing edge shrinkage