Bidirectional Fluid Structure Interaction Analysis for the Screw Centrifugal Pump

A full three-dimension bidirectional fluid-structure coupled simulation combined the inner flow field and structure field is established to study the effect of FSI on external characteristics and the pressure field and velocity field at different positions of the impeller in screw centrifugal pump with single blade.For the calculation, the flow field is based on Reynolds-averaging N-S equations and standard two equation k-ε turbulent model with multiple reference frame, and the structure response is based on elastic structural dynamic equation.Compared the results with FSI to that without FSI, the analysis shows that the head and efficiency curve with FSI are much closer to test values, the effect of FSI on external characteristics under low flow rate is larger than that under high flow rate.The effect of FSI on the pressure field and velocity field mainly concentrate in diffuser and less effect on blade and other part of volute.The pressure distribution occurs a significant difference with two calculation methods at the volute middle section, and the pressure distribution produces mutation when the outlet of impeller directly face cutwater.