Analysis Of Axial Force Of The Large Canned Motor Pump

The pump has excellent sealing performance with no leakage.The characteristics of the pump accord to the development of national economy and has great advantage for working medium with toxic or radiation.The axial force has been one of the important factors considered for canned motor pump design.Axial force balance has great significant and application value for extend service life and safety of the pump.In this paper,simplified canned motor pump is selected as the research object of simulation analysis based on whole flow field.Pre-processing includes meshing,simplifying and modeling of flow field.In order to get the results of Von Mises,deformation and axial force,the simulation analysis is based on different coupling.After some adjustments,boundary conditions are confirmed to close real physical environment,while pay particular attention to dynamic mesh and sliding mesh.Flow field is simulated with cell zone condition based on MRF by one-way fluidsolid coupling.The pressure of flow field is simulated as prestress for structural module.In order to be closer to the real physical environment,dynamic mesh and transient analysis are used in two-way fluid-solid coupling.The validity of numerical simulation is verified by experiments.The Von Mises is decreased with increasing of impeller's radius,and the deformation is increased with increasing of impeller's radius.One of the most challenging and critial aspect is the impeller hub and impeller outlet.The maximum is 207 Mpa and 0.05 mm.Axial force is calculated by simulation results and theorem of momentum.Moreover,compared with the experimental results,the maximum error is 5.1%,within the permissible error range.It can provide reference for the design of canned motor pump and axial force balance.