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Prediction of Heat Transfer and Flow Transition on Transonic Turbine Airfoils Under High Freestream Turbulence

[+] Author Affiliations
Jiang Luo, Eli H. Razinsky

Solar Turbines Incorporated, San Diego, CA

Paper No. GT2008-50868, pp. 1301-1310; 10 pages
doi:10.1115/GT2008-50868
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 Solar Turbines Incorporated

abstract

Accurate modeling of the laminar-turbulent transition remains a challenge for the prediction of external heat transfer on turbine airfoils. This paper presents a numerical study for turbine heat transfer and by-pass transition under high freestream turbulence using advanced turbulence models. Reynolds-Averaged Navier-Stokes (RANS) analyses have been carried out for two transonic turbine airfoils, with inlet turbulence intensity ranging from 12% to 16%, and exit Reynolds number varying from 8×105 to 1.5×106 . The RANS results are compared against the recent data from Virginia Tech, as well as the predictions from a 2-D boundary layer code — TEXSTAN. The effects of inlet turbulence length scale on the freestream turbulence decay and boundary layer transition are investigated using different models, including a Reynolds stress model. It is found that a postulation by Steelant and Dick can be used to set up plausible turbulence length scales at the inlet. It is observed that maintaining a proper decay rate of freestream turbulence inside the turbine passages is necessary to achieve reasonably good prediction of transition and heat transfer. The V2F, SST, and k-ε turbulence models have been assessed.

Copyright © 2008 by Solar Turbines Incorporated

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