Characterization of Secondary Flows in a High Blockage Ratio Internal Cooling Channel

Authors

I. Mayo - von Karman Institute For Fluid Dynamics, ‘Jacques Chauvin’ laboratory, Belgium
O. Cildir - von Karman Institute For Fluid Dynamics, ‘Jacques Chauvin’ laboratory, Belgium
T. Arts - von Karman Institute For Fluid Dynamics, ‘Jacques Chauvin’ laboratory, Belgium

Abstract

The three dimensional flow field inside a scaled up model of an internal cooling channel is examined experimentally by means of Stereoscopic Particle Image Velocimetry (SPIV) at a Reynolds number of 40000. The channel presents a square cross section with a set of seven equidistant square ribs placed perpendicularly to the main flow direction on one of the walls. The pitch to height ratio between consecutive ribs is equal to 10, while the height of the ribs causes a blockage of 30% of the channel height. The mean values of the three velocity components are measured between the 5^th and 6^th rib, in planes perpendicular to the main flow direction. These results are compared with the already two-component velocity measurements available in literature, evaluating the magnitude of the main and secondary flows in the interrib region. Moreover, the present setup allows the extension of the already existing 2D data by introducing additional investigated planes and by measuring the complete Reynolds stresses tensor as well as the turbulent kinetic energy.