Hydrodynamically Numerical Computation and Efficiency Correction on a Supercritical Pump with Complex Double-Cases

The three-dimensional turbulent flow in a supercritical pump with complex double-cases based on the integral model combined with the pass-by pipes is computed and simulated by means of a parallel computer and the software FLUENT using the mathematical models (Navier-Stokes equations, RNG k-ε turbulence model and boundary conditions) in Computational Fluid Dynamics (CFD), which aims at improving the pump´s performance. Meanwhile, the supercritical pump´s efficiency correction is emphasized according to the leakages at wear rings of impellers and at the radial clearances between pump stages; the pump´s hydraulic design and improvement are briefly introduced; the effects of grid number and pass-by pipes on the computational accuracy are discussed, and the flow fields in the internal complex passages of the pump are also represented. The hydro-dynamically numerical computational results and operation testing ones of the pump, which is modified from the original one based on the primary simulation results, indicate that they are in coincidence with each other well.