Unsteady Fluid Flow Analysis of Tongue Geometry in a Centrifugal Pump at Design and Off-design Conditions

In the present work, effects of modifying tongue geometry a centrifugal pump on pressure pulsations under design and off-design conditions are carried out numerically by unsteady analysis fluid flow. Numerical modeling based Re-Normalization Group (RNG) k-ε turbulence model using Mosaic mesh structure, technology which can easily, quickly formally connects any type for complex geometries flow regimes, is applied to simulate within modeled pump, validated with available experimental results. The simulated through commercial Computational Fluid Dynamics (CFD) software that solved Reynolds-Averaged Navier-Stokes (RANS) equations three-dimensional addition choosing Qd (the rate), 0.4 1.2Qd also taken into account as inlet rates. Besides, pressures 101KPa 13KPa considered additional this investigation. This simulation employing different used investigate impacts various volute angles coefficient (cp ). Results indicate that, overall, changing angle from 40° 85°, value at outlet grows about 10% where it causes rise in amplitude fluctuations. By same token, decrement rate up 40% nominal brings fluctuations be increased significantly.