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TURBULENT FLOW IN ROTATING RIB-ROUGHENED CHANNEL

Filippo Coletti
Turbomachinery & Propulsion Department - Jacques Chauvin Laboratory von Karman Institute for Fluid Dynamics 72 Chaussée de Waterloo, 1640 Rhode-Saint-Genèse, Belgium

Irene Cresci
Turbomachinery & Propulsion Department - Jacques Chauvin Laboratory von Karman Institute for Fluid Dynamics 72 Chaussée de Waterloo, 1640 Rhode-Saint-Genèse, Belgium

Tony Arts
Turbomachinery & Propulsion Department, Von Kármán Institute for Fluid Dynamics, Rhode-Saint-Genése, B-1640, Belgium

Аннотация

The unsteady turbulent flow in a rotating channel provided with wall-mounted ribs is investigated by means of Time- Resolved Particle Image Velocimetry. Space-time series of instantaneous velocity highlight the flapping motion of the separating and reattaching shear layer, while the shedding of spanwise vortices from the ribs is visualized using the swirling strength criterion. Space-time velocity correlations provide the convection velocity, the Eulerian and the Lagrangian scales in the free shear layer behind the rib. The major effects of rotation on these flow characteristics are demonstrated: those are related to the ability of Coriolis forces of promoting/inhibiting turbulence activity depending on the mutual orientation of system angular velocity and relative mean vorticity.