关键词: 泵喷推进器;推进性能;计算流体力学;斜流;数值模拟

Abstract: The phenomenon of oblique inflow is widespread in the operation of the propeller， which will adversely affect the hydrodynamic performance of the propeller. In order to analyze the effects of oblique flow on the propulsion efficiency and flow field of the pump-jet propulsor，multi-block was adopted to create the grid of all computation domain in a pump-jet propulsor. The method based on RANS equation and the SST k-ω turbulence model were adopted to study the hydrodynamic performance of a pump-jet propulsor in different rotation speed （n=3000，3600，4200r/min） and different oblique inflow angles （β=0°，5°，10°，15°，20°，25°，30°，40°）.The numberical simulation method was verified by duct propeller Ka4-70 with duct 19A and the calculated values were in good agreement with the experimental values.The results show that the propulsion efficiency changes tinily in little oblique angle and decreases significantly in oblique angle larger than 20°.This is because the distribution of the flow in pump-jet propulsor is uneven，and the concentration area and dispersion area appear，which decrease the balance of pump-jet propulsor and acceleration performance of the pump jet.Furthermore，the influence of tip clearance on the main flow increaces in larger oblique angle，and it also leads to the greater energy loss.

Key words: Pump-jet propulsor;Propulsion performance;Computational fluid dynamics;Oblique flow;Numerical simulation