NUMERICAL INVESTIGATION OF THE UNSTEADY FLOW INSIDE A CENTRIFUGAL COMPRESSOR STAGE WITH PIPE DIFFUSER

摘要

The subject of this paper is the investigation of unsteady flow inside a transonic centrifugal compressor stage with pipe-diffuser by utilizing unsteady 3D Navier-Stokes simulations (unsteady 3D URANS). The CFD results obtained are compared with detailed experimental data gathered using various steady and unsteady measurement techniques. The basic phenomena and mechanisms of the complex and highly unsteady flow inside the compressor with pipe-diffuser are presented and analyzed in detail.