Aerodynamic Damping of the Tubed Vortex Reducer in an Axial Compressor Disk Cavity

The tubed vortex reducer in the axial compressor can destroy disk cavity, by a thin-walled tube, to reduce total pressure loss. tube may suffer from vibration problems, such as flutter and forced vibration, which are closely related aerodynamic damping. In this paper, energy method influence coefficient used study damping of tube. Based on modal characteristics, steady unsteady flow characteristics first second modes with lower frequencies greater risk selected analysis objects. is calculate different amplitudes, shows that results approximately meet linear assumption accurate. obtained show between adjacent tubes very small, effect inter-tube phase angle be ignored. Finally, it found structural coupling caused support ring mainly reflected two aspects: frequency reduction mode coupling.