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ISSN Online: 2377-424X

ISBN Print: 1-56032-797-9

International Heat Transfer Conference 11
August, 23-28, 1998, Kyongju, Korea

INVESTIGATIONS OF THE EFFECTS OF BULK FLOW PULSATIONS ON FILM COOLING AS APPLIED TO GAS TURBINE ENGINES

Get access (open in a dialog) DOI: 10.1615/IHTC11.1240
pages 517-522

Résumé

Experimental results are presented which describe the effects of bulk flow pulsations on film cooling from a single row of simple-angle, round film, cooling holes. The pulsations are in the form of sinusoidal variations of static pressure and streamwise velocity. Such pulsations are important in turbine studies because: (i) static pressure pulsations result in significant periodic variations of film cooling flow rates, coverage, and trajectories, and (ii) static pressure pulsations occur near blade surfaces in operating engines from potential flow interactions between moving blade rows and from families of passing shock waves. Distributions of spatially-averaged adiabatic film effectiveness, iso-energetic heat transfer coefficients, and heat transfer rates are presented which show the effects of bulk flow pulsations on these quantities. Also included are structural results which illustrate the influences of bulk flow pulsations on one component of mean velocity and one Reynolds stress tensor component.