Impeller Gap Width Effect on losses in a Water Pump; Numerical Study

Water pumps are used in agriculture and industryfor diverse applications. In this paper, the flow in asidewall gap of a water pump was studied usingnumerical method. The flow in sidewall gapproduces internal leakage and is the source of “diskfriction loss” which is the most important cause ofefficiency decline in low specific speed waterpumps. A high quality mesh for wear ring areadeveloped; with this scheme the modeling error hasbeen reduced. Navier-Stokes equations have beensolved for this domain. In order to predict theturbulence effects, the SST model has beenemployed. Streamlines, axial and circumferentialvelocities as well as pressure distribution illustratedIn addition to this, flow patterns discussedthoroughly.

کلیدواژه ها:

Numerical Study ، Water pumps ، Diskfriction loss ، sidewall gap