The profile loss of a gas turbine blade is normally associated with the entropy increase due to the boundary layer phenomena of viscous shear, Reynolds stress generation and heat transfer. To establish the relative contributions of laminar, transitional and turbulent adiabatic boundary layer flow, to the overall entropy generation (as described in part two of this paper), detailed hot film and hot wire measurements have been made over the suction surface of a turbine blade mounted within a subsonic linear cascade. At a Reynolds number of 185 × 103, a natural transition region was found between 53 and 70% suction surface length, followed by a slowly relaxing turbulent boundary layer. The wall shear stress distribution indicated a peak in the leading edge region, dropping to a minimum value prior to transition, with a sharp rise over the transitional length before decreasing within the turbulent portion. The measurements were compared with predictions obtained from a commercial computational fluid dynamics code, which utilised the renormalisation group theory (RNG) turbulence model.
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ASME Turbo Expo 2000: Power for Land, Sea, and Air
May 8–11, 2000
Munich, Germany
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-7856-9
PROCEEDINGS PAPER
Turbine Blade Entropy Generation Rate: Part I — The Boundary Layer Defined
M. R. D. Davies,
M. R. D. Davies
University Of Limerick, Limerick, Ireland
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F. K. O’Donnell,
F. K. O’Donnell
University Of Limerick, Limerick, Ireland
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A. J. Niven
A. J. Niven
University Of Limerick, Limerick, Ireland
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M. R. D. Davies
University Of Limerick, Limerick, Ireland
F. K. O’Donnell
University Of Limerick, Limerick, Ireland
A. J. Niven
University Of Limerick, Limerick, Ireland
Paper No:
2000-GT-0265, V003T01A070; 9 pages
Published Online:
August 4, 2014
Citation
Davies, MRD, O’Donnell, FK, & Niven, AJ. "Turbine Blade Entropy Generation Rate: Part I — The Boundary Layer Defined." Proceedings of the ASME Turbo Expo 2000: Power for Land, Sea, and Air. Volume 3: Heat Transfer; Electric Power; Industrial and Cogeneration. Munich, Germany. May 8–11, 2000. V003T01A070. ASME. https://doi.org/10.1115/2000-GT-0265
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