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Effect of Acceleration on the Heat Transfer Coefficient on a Film Cooled Surface PUBLIC ACCESS

[+] Author Affiliations
H. D. Ammari, N. Hay, D. Lampard

University of Nottingham, UK

Paper No. 90-GT-008, pp. V004T09A001; 8 pages
doi:10.1115/90-GT-008
From:
  • ASME 1990 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 4: Heat Transfer; Electric Power; Industrial and Cogeneration
  • Brussels, Belgium, June 11–14, 1990
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7907-8
  • Copyright © 1990 by ASME

abstract

Results are presented of an experimental investigation into the influence of mainstream acceleration on the heat transfer coefficient downstream of injection through a row of 35° holes in a flat plate. A mass transfer analogue technique was used, with two uniform acceleration parameters, K (=ν(du/dx)/u2), of 1.9 × 10−6 and 5.0 × 10−6 in addition to the zero acceleration base-line case.

Two injectants, air and carbon dioxide, were employed to give coolant to mainstream density ratios of 1.0 and 1.52 respectively. The blowing rate varied from 0.5 to 2.0.

The heat transfer coefficient beneath the film reduced progressively as the acceleration increased, with maximum reductions from the zero acceleration datum case of about 27%. In the presence of acceleration, the heat transfer coefficient at a given blowing rate was dependent on the density ratio, an increase in the density ratio leading to a decrease in the heat transfer coefficient. An empirical correlation of the data over most of the range of densities and blowing rates of the experiments has been developed.

Copyright © 1990 by ASME
This article is only available in the PDF format.

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