Analyzing the Impact of Clearance Leakage on Impeller Strength in Centrifugal Pump Using Fluid-solid Coupling
GAO Peng
HAN Rujun
QIAO Yu
NIE Zhifeng
Abstract：Taking the secondary impeller of DG-350 multistage centrifugal pump as a test model,this paper studied the influence of clearance leakage on secondary impeller deformation and strength based on fluid-structure interaction.The deformation distribution and equivalent stress were obtained from sequential fluid-solid coupling and strong fluid-solid coupling respectively.The results showed that the maximum deformation and the maximum equivalent stress were 0.021 4 mm and 21.51 MPa respectively when the clearance leakage was taken into account,and were 0.053 6 mm and 87 MPa respectively without considering the clearance leakage.The clearance between the wear-rings resulted in a great pressure between the impeller and the fluid guide vanes applied to the impeller front and r covers.This pressure could offset some fluid pressure on the impeller cavity and hence reduced the deformation and maximum equivalent stress zone on the impeller.Randomly selecting a point A and a point B near the maximum deformation zone and the maximum equivalent stress on the impeller respectively,transition analysis showed that the equivalent stress at points A and B varied periodically with time in the last rotation period.The equivalent stress at node B was always higher than that at node A and was close to the maximum equivalent stress,revealing that the region in the proximity of B has the highest stress.The equivalent stress at node A was less than that at node B,but it fluctuated more profoundly,indicating a likely occurrence of fatigue.
Keywords：fluid-structure interactionclearance between the wear-ringsimpeller strength
Publication Date：2017-01-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：6( 53-58 )