A subsonic centrifugal compressor impeller with splitter blades of 1.5 pressure ratio was analyzed by CFD software of Numeca using Spalart-Allmaras(S-A) and shear stress transport(SST) models to study the accuracy of numerical simulation results. The measured results of the impeller and verifications of CFD at four sections were presented with respect to the velocity distribution

etc. Results show that the simulation results of S-A and SST models are almost the same

with the difference less than 1%; In general

the numerical simulation agrees well with the experiment

the difference is less than 2% at design point and 6% in off-design condition. The difference of numerical simulation and experiment results of velocity distribution is large in different cross sections. There are relatively big differences about 20% near hub and more than 100% near shroud

which can not truly reflect the flow condition near the shroud.