Calculation of losses in tubular diffusor of centrifugal pumps

Results of rated researches of flowing parts of centrifugal pumps with factors of rapidity n S ≈70 and n S ≈95 are presented. Researches are executed in ANSYS CFX program complex. For the pump with n S≈70 influence of channels number in tubular diffusor device on hydraulic characteristics at transtage is investigated. Comparison of tubular and blades diffusors is carried out. For the pump with n S ≈95 gap influence between the impeller and the tubular diffusor on fractional hydraulic loss is analysed.