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ISSN Online: 2377-424X

ISBN Print: 0-89116-299-2

International Heat Transfer Conference 7
September, 6-10, 1982, Munich, Germany

FILM COOLING EFFECTIVENESS OF DISCRETE HOLES MEASURED BY MASS TRANSFER AND LASER INTERFEROMETER

Get access (open in a dialog) DOI: 10.1615/IHTC7.210
pages 117-122

Sinopsis

Film cooling of discrete holes at different injection angles and compound-angles was studied experimentally along the flat plate. After a certain amount of carbon dioxide had been mixed with the air injection stream, the carbon dioxide concentration measurements were carried out downstream of the film-cooling holes by the chromatograph. The He-Ne interferometer and Schlieren optical equipment were used to study the flow fields near the injection holes. The results measured by heat-mass transfer analogy and the results observed by optical instruments near the film injection holes agree with each other very well over the wide range of blowing rates. The recirculation zone near the film injection holes was carefully studied at different injection angles, blowing rates and momentum ratios. It was observed that at a given value of blowing rate M, the rectangular holes and compound-angle round holes gave higher effectiveness than the round holes.