The influence of curvature on film cooling performance

S. G. Schwarz, R. J. Goldstein, E. R.G. Eckert

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

The effects of injection rate and strength of curvature on film cooling performance of gas injected through a row of holes on a convex surface is studied. Comparisons are made to film cooling of concave and flat surfaces. Three different relative strengths of curvature (ratio of radius of curvature to radius of injection hole), two density ratios (0.95 and 2.0), and a wide range of blowing rates (0.3 to 2.7) are considered. A foreign gas injection technique (mass transfer analogy) is used. The strength of curvature was controlled by varying the injection hole diameter. At low blowing rates, film cooling is more effective on the convex surface than on a flat or a concave surface. The cross stream pressure gradient present in curved flows tends to push the jet into the convex wall. As the injection rate is increased, normal and tangential jet momentum promote lift-off from the convex surface, thereby lowering performance. In contrast, previous studies show that on a concave surface, tangential jet momentum, flow instabilities, and blockage improve performance on a concave surface as blowing rate is increased.

Original languageEnglish (US)
Title of host publicationHeat Transfer; Electric Power; Industrial and Cogeneration
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791879078
DOIs
StatePublished - 1990
EventASME 1990 International Gas Turbine and Aeroengine Congress and Exposition, GT 1990 - Brussels, Belgium
Duration: Jun 11 1990Jun 14 1990

Publication series

NameProceedings of the ASME Turbo Expo
Volume4

Other

OtherASME 1990 International Gas Turbine and Aeroengine Congress and Exposition, GT 1990
CountryBelgium
CityBrussels
Period6/11/906/14/90

Bibliographical note

Funding Information:
The research reported herein was conducted with the support of the Air Force Office of Scientific Research (Contract Number F49620-

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