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Experimental and Numerical Investigation of Convective Heat Transfer in a Gas Turbine Can Combustor

[+] Author Affiliations
Sunil Patil, Santosh Abraham, Danesh Tafti, Srinath Ekkad

Virginia Polytechnic Institute and State University, Blacksburg, VA

Yong Kim, Partha Dutta, Hee-Koo Moon, Ram Srinivasan

Solar Turbines, Incorporated, San Diego, CA

Paper No. GT2009-59377, pp. 1363-1371; 9 pages
doi:10.1115/GT2009-59377
From:
  • ASME Turbo Expo 2009: Power for Land, Sea, and Air
  • Volume 3: Heat Transfer, Parts A and B
  • Orlando, Florida, USA, June 8–12, 2009
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4884-5 | eISBN: 978-0-7918-3849-5
  • Copyright © 2009 by ASME

abstract

Experiments and numerical computations are performed to investigate the convective heat transfer characteristics of a gas turbine can combustor under cold flow conditions in a Reynolds number range between 50,000 and 500,000 with a characteristic swirl number of 0.7. It is observed that the flow field in the combustor is characterized by an expanding swirling flow which impinges on the liner wall close to the inlet of the combustor. The impinging shear layer is responsible for the peak location of heat transfer augmentation. It is observed that as Reynolds number increases from 50,000 to 500,000, the peak heat transfer augmentation ratio (compared to fully-developed pipe flow) reduces from 10.5 to 2.75. This is attributed to the reduction in normalized turbulent kinetic energy in the impinging shear layer which is strongly dependent on the swirl number that remains constant at 0.7 with Reynolds number. Additionally, the peak location does not change with Reynolds number since the flow structure in the combustor is also a function of the swirl number. The size of the corner recirculation zone near the combustor liner remains the same for all Reynolds numbers and hence the location of shear layer impingement and peak augmentation does not change.

Copyright © 2009 by ASME

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