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Comparison of Two-Equation Turbulence Models for Prediction of Heat Transfer on Film-Cooled Turbine BladesA three-dimensional Navier-Stokes code has been used to compute the heat transfer coefficient on two film-cooled turbine blades, namely, the VKI rotor with six rows of cooling holes, including three rows on the shower head and the C3X vane with nine rows of holes, including five rows on the shower head. Predictions of heat transfer coefficient at the blade surface using three two-equation turbulence model specifically, Coakley's q-omega model, Chien's k-epsilon model and Wilcox's k-omega model with Menter's modifications, have been compared with the experimental data of Camci and Arts for the VKI rotor, and of Hylton et al. for the C3X vane along with predictions using the Baldwin-Lomar (B-L) model taken from Garg and Gaugler. It is found that for the cases considered here the two equation models predict the blade heat transfer somewhat better than the B-L model except immediately downstream of the film-cooled holes on the suction surface of the VKI rotor, and over most of the suction surface of the C3X vane. However, all two-equation models require 40% more computer core than the B-L model for solution, and while the q-omega and k-epsilon models need 40% more computer time than the B-L model the k-omega model requires at least 65% more time because of the slower rate of convergence. It is found that the heat transfer coefficient exhibit a strong spanwise as well as streamwise variation for both blades and all turbulence models.
Document ID
19990104324
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Garg, Vijay K.
(AYT Corp. Cleveland, OH United States)
Ameri, Ali A.
(AYT Corp. Cleveland, OH United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1997
Publication Information
Publication: Numerical Heat Transfer
Volume: 31
Issue: Pt A
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
ASME Paper 97-GT-024
Distribution Limits
Public
Copyright
Other

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