Full Coverage Discrete Hole Film Cooling: The Influence of Hole Size PUBLIC ACCESS

[+] Author Affiliations
G. E. Andrews, A. A. Asere, M. L. Gupta, M. C. Mkpadi

University of Leeds, Leeds, UK

Paper No. 85-GT-47, pp. V003T09A003; 8 pages
  • ASME 1985 International Gas Turbine Conference and Exhibit
  • Volume 3: Heat Transfer; Electric Power
  • Houston, Texas, USA, March 18–21, 1985
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7940-5
  • Copyright © 1985 by ASME


The influence of hole size and hence blowing rate on full coverage discrete hole wall cooling for gas turbine combustion chamber applications was investigated. Two temperature conditions were used firstly a 750K gas temperature and 300K coolant, and secondly a realistic combustor primary zone conditions of 2100K flame temperature and 700K coolant. It was shown that a large hole size resulted in a significant improvement in the overall cooling effectiveness due to a reduced film heat transfer coefficient. At high temperature the cooling effectiveness was reduced due to radiative heat transfer from the flame gases. At low coolant flow large temperature increases of the coolant occurred within the wall and approached the transpiration situation.

Copyright © 1985 by ASME
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