Open Access3D Unsteady Flow and Forces in Centrifugal Impellers With Circumferential Distortion of the Outlet Static Pressure
Author(s) -
A. Fatsis,
Stéphane Pierret,
R. A. Van den Braembussche
Publication year - 1995
Publication title -
volume 1: turbomachinery
Language(s) - English
Resource type - Conference proceedings
DOI - 10.1115/95-gt-033
Subject(s) - impeller , strouhal number , mechanics , static pressure , physics , flow (mathematics) , flutter , centrifugal force , centrifugal compressor , centrifugal pump , aerodynamics , turbulence , reynolds number
This paper describes the numerical investigation of the centrifugal impeller response to downstream static pressure distortions imposed by volutes at off-design operations. An unsteady 3D Euler solver with non-reflecting upstream and downstream boundary conditions and phase-lagged periodicity conditions is used for this purpose. The mechanisms governing the unsteady flow field are analysed. A parametric study shows the influence of the acoustic Strouhal number on the amplitude of the flow perturbations. Radial forces calculated on backward leaned and radial ending centrifugal impellers, show non-negligible influence of the impeller geometry.