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Effects of Freestream Turbulence on Turbine Blade Heat TransferExperiments have shown that moderate turbulence levels can nearly double turbine blade stagnation region heat transfer. Data have also shown that heat transfer is strongly affected by the scale of turbulence as well as its level. In addition to the stagnation region, turbulence is often seen to increase pressure surface heat transfer. This is especially evident at low to moderate Reynolds numbers. Vane and rotor stagnation region, and vane pressure surface heat transfer augmentation is often seen in a pre-transition environment. Accurate predictions of transition and relaminarization are critical to accurately predicting blade surface heat transfer. An approach is described which incorporates the effects of both turbulence level and scale into a CFD analysis. The model is derived from experimental data for cylindrical and elliptical leadng edges. Results using this model are compared to experimental data for both vane and rotor geometries. The comparisons are made to illustrate that using a model which includes the effects of turbulence length scale improves agreement with data, and to illustrate where improvements in the modeling are needed.
Document ID
20040121191
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Boyle, Robert J.
(NASA Glenn Research Center Cleveland, OH, United States)
Giel, Paul W.
(QSS Group, Inc. Cleveland, OH, United States)
Ames, Forrest E.
(North Dakota Univ. Grand Forks, ND, United States)
Date Acquired
August 22, 2013
Publication Date
August 1, 2004
Publication Information
Publication: Minnowbrook IV: 2003 Workshop on Transition and Unsteady Aspects of Turbomachinery Flows
Subject Category
Fluid Mechanics And Thermodynamics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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