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Effects of Surface Roughness and Near Hole Obstructions on Film Cooling Effectiveness

[+] Author Affiliations
Ruwan P. Somawardhana, David G. Bogard

University of Texas at Austin, Austin, TX

Paper No. GT2007-28004, pp. 799-809; 11 pages
  • ASME Turbo Expo 2007: Power for Land, Sea, and Air
  • Volume 4: Turbo Expo 2007, Parts A and B
  • Montreal, Canada, May 14–17, 2007
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4793-4 | eISBN: 0-7918-3796-3
  • Copyright © 2007 by ASME


For a film cooled turbine airfoil, significant degradation of adiabatic effectiveness can be caused by near-hole obstructions formed from deposition of contaminants. Since obstructions are a randomly occurring event, there are many variables to consider, namely shape, width, length, height, and position in relation to a film cooling hole. In addition to this, the level of overall surface roughness also must be considered. An investigation was conducted on obstruction characteristics for a single row of holes on the suction side of a simulated turbine vane. It was found that degradation due to near-hole obstructions only occurred when upstream obstructions were present. When directly upstream, degradation levels around 40% were observed and obstruction height was the dominating characteristic.

Copyright © 2007 by ASME



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