AN UNSTEADY OVERSET GRID METHOD FOR THE SIMULATION OF COMPRESSORS WITH NON CIRCUMFERENTIAL CASING TREATMENTS

摘要

This paper describes a CFD method enabling unsteady RANS computations of compressor configurations including non axisymetric casing treatments. The interaction between the casing treatment and the rotor is simulated thanks to an overset grid approach, in which the meshes of the rotor blade channel and of the slot are independent. The method uses a phase-lag type approach which enables to reduce the computational domain to one single slot and one rotor blade channel. The present method is evaluated on an experimental configuration of casing treatments at two rotating speeds.