Hydraulic design method for full-lift pump impeller

The invention relates to a hydraulic design method for a full-lift pump impeller. The hydraulic design method for the full-lift pump impeller is proposed according to the characteristic that when a shaft power curve of a centrifugal pump rises continuously along with increasing of flow, shaft power curves of a high specific speed mixed flow pump and an axial flow pump decline continuously along with increasing of flow, and the specific speed of the pump ranges from 230 to 250, the power curve of the pump is stable, and non-overload performance is achieved at any working condition point in the range from the shut-off lift to the zero lift. According to the required lift H and flow Q, the flow and the lift under the specific speed ns are each multiplied by a proportionality coefficient, H1 and Q1 are obtained, the specific speed ns1 of the pump under H1 and Q1 is larger than or equal to 230 and smaller than or equal to 350, and the full-lift pump with the non-overload characteristic and the specific speed being larger than or equal to 230 and smaller than or equal to 350 is designed with H1 and Q1 as design points. Main design parameters include the diameter D1 of an inlet of the impeller, the diameter dh of a hub of the impeller, a setting angle beta 1 of inlets of blades, a setting angle beta 2 of outlets of the blades, the diameter D2 of an outlet of the impeller, the width beta 2 of the outlets of the blades, the number Z of the blades and the wrap angle theta of the blades.