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Numerical Investigation of Anisotropic Turbulence Effects Around a Film Cooled Turbine Vane

[+] Author Affiliations
Dieter E. Bohn, Christian Tümmers

Aachen University of Technology, Aachen, Germany

Paper No. GT2002-30599, pp. 1027-1034; 8 pages
doi:10.1115/GT2002-30599
From:
  • ASME Turbo Expo 2002: Power for Land, Sea, and Air
  • Volume 5: Turbo Expo 2002, Parts A and B
  • Amsterdam, The Netherlands, June 3–6, 2002
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-3610-X | eISBN: 0-7918-3601-0
  • Copyright © 2002 by ASME

abstract

In this paper the 3D flow around a turbine vane with showerhead cooling is simulated with the anisotropic cubic-eddy-viscosity k-ε turbulence model of Craft et. al. The results are analyzed in detail and compared to calculations performed with the isotropic algebraic turbulence model by Baldwin & Lomax and the isotropic Low-Reynolds k-ε-model of Launder et. al. for the same test case. The computational domain consists of the coolant supply (plenum), the ejection holes and the main flow region around the vane. Periodic boundary conditions have been used in the radial direction. Thus, endwall effects have been excluded. The numerical investigations focus on the influence of the anisotropic effects in the flow field. The flow conditions are taken from experimental investigations conducted by other authors and the results have been documented as a test case for numerical calculations of ejection flow phenomena. The results show a similar distribution of the predicted total pressure loss in the kidney vortex and downstream the ejection holes for the cubic-eddy viscosity model in comparison to the other turbulence models. Furthermore it is shown, that the influence of the cooling jets on the main flow, predicted by the two-equation models of Launder et. al. and Craft. et al., seems to be slightly higher compared to the algebraic model of Baldwin & Lomax.

Copyright © 2002 by ASME
Topics: Turbulence , Turbines

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