Design method of hydraulic model of shaftless drive type integrated motor pump jet

The invention discloses a design method of a hydraulic model of a shaftless drive type integrated motor pump jet. By means of the method, the propeller which is equal to a seven-blade highly skewed propeller in open water efficiency and lower in radiation noise can be designed, wherein a motor and the pump jet are completely integrated. The method comprises the steps of a pump fluid channel hydraulic parameter type selection design, a parametric three-dimension reversal design of pre-positioned stator and post-positioned impeller blades, non-air-gap pump jet open water performance checking, and propelling, cavitation and noise performance and strength checking of the integrated motor pump jet. The pump jet which is composed of a thick guide pipe of an embedded motor stator, a motor annular rotor, an air gap, a pre-positioned stator and a post-positioned impeller is designed. The propelling efficiency is 0.589, the power is 3.7 MW and the pump jet can propel submersible vehicles with the navigational speed being 16 knots. The number of the stator blades is 13, the number of the impeller blades is 9, an NACA 16 wing type thickness distribution method is adopted for the stator blades and the impeller blades, and the impeller is highly skewed. The design method can be directly used for realizing shaftless electric propelling of unverwater vehicles, and is also suitable for shaft type pump jets and torpedo post-positioned stator type integrated motor pump jets.