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Thermophysics and Aeromechanics

2003 year, number 2

Unsteady vortical wakes behind mutually moving rows of axial turbomachine

V.E. Saren and S.A. Smirnov
Federal State Unitary Enterprise
Pages: 175-188


The structure of nonstationary vortical wakes of the rotor was studied experimentally in the system of rows stator – rotor – stator of the axial compressor. It was established that besides deceleration of relative flow velocity in the zone of turbulent vortical wake of the blades, a layer of free vortices develops at the wake axis. The free vortices pulsate with the frequency of passing of blades between neighbor rows, causing pulsation in velocity, pressure; and due to mixing process the total pressure loss becomes higher.