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The Effects of Unintentional Deviations Due to Manufacturing of Cooling Holes and Operation on Transpiration Cooling Efficiency

[+] Author Affiliations
Dieter Bohn, Robert Krewinkel

RWTH Aachen University, Aachen, Germany

Paper No. GT2006-90856, pp. 689-699; 11 pages
  • ASME Turbo Expo 2006: Power for Land, Sea, and Air
  • Volume 3: Heat Transfer, Parts A and B
  • Barcelona, Spain, May 8–11, 2006
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4238-X | eISBN: 0-7918-3774-2
  • Copyright © 2006 by ASME


A full-coverage cooled multi-layer plate configuration is investigated numerically by application of a 3-D conjugate fluid flow and heat transfer solver, CHTflow. The geometrical setup and the fluid flow conditions derive from modern gas turbine combustion chambers and bladings. The numerical grid contains the coolant supply (plenum), the solid body and the main flow area on the plate. The full-coverage cooling is realized by finest drilled holes with a diameter of 0.2 mm that are shaped in the region of the thermal barrier coating. Two different effects will be considered in this paper. First, the effects of deviations in the cooling hole geometry due to the manufacturing process will be discussed, then the effects of an obstruction in one of the cooling holes will be looked at. The numerical investigation focuses on the cooling efficiency on the plate surface and on the cooling hole surface as well as the aerodynamics in the main flow. The scientific work is embedded in the Collaborative Research Center 561 at RWTH Aachen University.

Copyright © 2006 by ASME



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