The article presents a refining method for a two-stage screw centrifugal pump by the joint usage of mathematical optimization software IOSO, meshing complex NUMECA and CFD software ANSYS CFX.The pump main parameters: high-pressure stage rotor speed was 13300 rpm; low-pressure rotor speed was 3617 rpm by Jandy SFTM Sand Filter Parts gearbox; inlet total pressure was 0.4 MPa; outlet mass flow was 132.6 kg/s at the nominal mode.
This article describes the process of simplifying the calculation model for the optimization.The parameters of camber lines of the low-pressure impeller, transition duct, and high-pressure impeller blades for two sections (hub and shroud) were chosen as Diaper Cream optimization parameters.The blades of low-pressure impeller, transition duct and high-pressure impeller have changed during optimization.The optimization goal was the increase of the pump efficiency with preservation or slight increase in the pressure head.
The efficiency was increased by 3%.