An Experimental Investigation of the Velocity and Temperature Fields of Cold Jets Injected Into a Hot Crossflow

[+] Author and Article Information
H. A. Rydholm

Volvo Aero Corp., Trollättan, Sweden; Chalmers University of Technology, Dept of Thermo and Fluid Dynamics, Göteborg, Sweden

J. Turbomach 120(2), 320-326 (Apr 01, 1998) (7 pages) doi:10.1115/1.2841409 History: Received February 01, 1996; Online January 29, 2008


It is shown here by dimensional analysis that the near-wall flow field of an effusion-cooled combustor can be scaled if the Reynolds, Mach, and Prandtl numbers and the temperature and velocity ratios are kept constant. It is also demonstrated that a practical model experiment can be designed, which fulfills all the scaling laws. A test rig meeting these requirements has been designed, built and tested. The experimental conditions have been chosen to correspond to the conditions usually met in a real effusion-cooled combustion chamber. One geometric configuration has been investigated. This consists of one transverse row of holes drilled with a 30 deg angle to the wall through which the cooling air enters a cross-flowing mainstream. The mean values of all three velocity components and the three normal fluctuating Reynolds stresses as well as the mean temperature have been measured in a large number of points surrounding the central injection hole. Experiments were carried out for jet-to-mainstream density ratios of 1.2 and 1.8. The results indicate that realistic density ratios are necessary to provide data directly applicable to effusion-cooling design.

Copyright © 1998 by The American Society of Mechanical Engineers
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