Design method for spraying centrifugal clean water pump impeller

The invention discloses a design method for spraying a centrifugal clean water pump impeller. Spraying technical treatment is carried out on the inner surface of the centrifugal clean water pump impeller, the centrifugal pump spraying efficiency estimation formula eta is corrected, and optical design is carried out on the inlet diameter Dj of the sprayed centrifugal pump impeller, the outer diameter D2 of the impeller, the outlet width b2 of the impeller, the blade number z and the blade wrap angle phi; after spraying technical treatment is carried out, the boundary layer of liquid flow on the inner wall of the impeller can be changed, the liquid flow state is greatly changed thereupon, liquid turbulence flow and local small vortex are reduced, and therefore the pump efficiency is greatly improved; and meanwhile, the design cost is reduced, the design period is greatly shortened, and therefore the design effect of more accurately and efficiently spraying the centrifugal clean water pump impeller is achieved.