The Numerical Simulation Study of the Inner Flow Field of the Screw Pump

摘要

In SolidWorks software, established stator and rotor model of screw pump, and succeeded in assembly. Established the dynamic grid of the description of the rotor movement by using the fimction of UDF provided by Fluent software; builded the dynamic numerical simulation of internal unsteady flow of screw pump by using Fluent software solver, and obtained velocity distribution, pressure distribution and stress field of the flow field.Analized the effect of the fluid viscosity, rotor speed and screw pump eccentricity convection to the flow field. The results show that when the rotor leaves both ends of the stator, flow field in the pump always appears a very clear vortex; Viscosity affected only the value of velocity, pressure and stress, while it has little effect to the distribution laws;The speed of the rotor has a great influence to the velocity distribution, and the velocity of the fluid increases with rotor speed increases.In addition, the eccentricity of the FCP has a big influence on the flow field, and flow field parameters increases with the eccentricity increases, which indicates that the eccentricity has a great influence on the stability of the screw pump.