0401 Unsteady Three-Dimensional Vortical Flow Analysis in a Multistage Axial Compressor Using Full-Annulus and Large-Scale Numerical Simulation

Abstract

In multistage turbomachinary, complex unsteady flow phenomena are inherent due to the bladerow interaction. Its effect is non-negligible for the performance and the stability. Therefore, in this study, we performed large-scale full-annulus DES calculations to investigate the unsteady flow phenomena in a multistage axial compressor. The simulation showed that the large-scale fluctuation of blade torque was caused by the interaction between the wake from the upstream stator and the leading edge separation on the blade suction surface.