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Characterization of Advanced Combustor Cooling Concepts for Metallic Walls and Oxide Ceramic Matrix Composites in a Reacting Flow

[+] Author Affiliations
Thomas Behrendt, Tim Richter, Anna-Samira Söhngen

DLR German Aerospace Center, Köln, Germany

Paper No. GT2014-26909, pp. V05CT18A014; 13 pages
doi:10.1115/GT2014-26909
From:
  • ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
  • Volume 5C: Heat Transfer
  • Düsseldorf, Germany, June 16–20, 2014
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4573-8
  • Copyright © 2014 by ASME

abstract

Effusion or full-coverage cooling is a promising approach to cooling especially the walls of lean combustors where the cooling air consumption is to be reduced significantly. Due to typical velocity distributions and cooling air pressure drop in a combustor the effectiveness can be further increased by reducing the cooling air momentum. Double skin designs like impingement effusion cooling offer a significant improvement but at the drawback of a complex and expensive manufacturing process. In this contribution different advanced cooling concepts offering a similar reduction of the cooling air jet momentum in a single skin design for metal and ceramic walls are characterized under realistic conditions. Lateral trenches as well as effusion holes with 90° turns are used. Their total cooling effectiveness is compared to a plain single skin effusion cooling concept. A configuration with cooling air flowing parallel to the surface into lateral trenches revealed the highest and most uniform distribution of the cooling effectiveness. The metallic samples are manufactured using additive manufacturing offering additional degrees of freedom in the cooling design in comparison to conventional manufacturing techniques.

Copyright © 2014 by ASME

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