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Investigation of Innovative Trailing Edge Cooling Configurations With Enlarged Pedestals and Square or Semicircular Ribs: Part 1—Experimental Results

[+] Author Affiliations
Bruno Facchini, Lorenzo Tarchi

University of Florence, Firenze, Italy

Paper No. GT2008-51047, pp. 931-941; 11 pages
doi:10.1115/GT2008-51047
From:
  • ASME Turbo Expo 2008: Power for Land, Sea, and Air
  • Volume 4: Heat Transfer, Parts A and B
  • Berlin, Germany, June 9–13, 2008
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4314-7 | eISBN: 0-7918-3824-2
  • Copyright © 2008 by ASME

abstract

This paper describes a heat transfer experimental study of several trailing edge cooling configurations based on the combination of two different heat transfer enhancing devices: enlarged pedestals and ribs. The baseline geometry consists of a wedge shaped duct with two arrays of enlarged pedestals. Square or semicircular turbulators were arranged in between the pedestals of the first row in three different positions: first on the pressure side (PS), then on the suction side (SS) and finally on both end-walls of the duct. For each configuration heat transfer and pressure loss measurements were made keeping the Mach number at 0.3 and varying the Reynolds number from 9000 to 27000. Detailed maps of heat transfer coefficient over the PS surface were measured using the transient technique with thermo-chromic liquid crystals. Results show that the combined effect of flow acceleration and turbulators lead to a significant increase of the heat transfer. The comparison between square and semicircular ribs shows that the wall heat transfer enhancement capability of the former shape is definitely higher only in the configuration with both ribbed surfaces; in like manner, square ribs generate higher pressure losses. In the configurations with one ribbed surface there are no remarkable differences between the two shapes. It is anyway interesting that the ribs placed on one side do not affect significantly the opposite smooth endwall behavior while they enhance HTC on their side, highlighting the possibility to increase cooling performance only on the airfoil side exposed to higher temperatures.

Copyright © 2008 by ASME
Topics: Cooling

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