Heat transfer coefficients are experimentally measured in a rotating cooling channel used to model an internal cooling passage near the trailing edge of a gas turbine blade. The regionally averaged heat transfer coefficients are measured in a wedge-shaped cooling channel (, ). The Reynolds number of the coolant varies from 10,000 to 40,000. By varying the rotational speed of the channel, the rotation number and buoyancy parameter range from 0 to 1.0 and 0 to 3.5, respectively. Significant variation of the heat transfer coefficients in both the spanwise and streamwise directions is apparent. Spanwise variation is the result of the wedge-shaped design, and streamwise variation is the result of the sharp entrance into the channel and the turn at the outlet of the channel. With the channel rotating at 135° with respect to the direction of rotation, the heat transfer coefficients are enhanced on every surface of the channel. Both the nondimensional rotation number and buoyancy parameter have proven to be excellent parameters to quantify the effect of rotation over the extended ranges achieved in this study.
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Research Papers
Heat Transfer in Trailing Edge, Wedge-Shaped Cooling Channels Under High Rotation Numbers
Lesley M. Wright,
Lesley M. Wright
Department of Aerospace and Mechanical Engineering,
The University of Arizona
, Tucson, AZ 85721-0119
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Yao-Hsien Liu,
Yao-Hsien Liu
Turbine Heat Transfer Laboratory, Department of Mechanical Engineering,
Texas A&M University
, College Station, TX 77843-3123
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Je-Chin Han,
Je-Chin Han
Distinguished Professor and Marcus Easterling Endowed Chair
Turbine Heat Transfer Laboratory, Department of Mechanical Engineering,
e-mail: jc-han@tamu.edu
Texas A&M University
, College Station, TX 77843-3123
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Sanjay Chopra
Sanjay Chopra
Siemens Power Company
, 4400 Alafaya Trail, Orlando, FL 32826
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Lesley M. Wright
Department of Aerospace and Mechanical Engineering,
The University of Arizona
, Tucson, AZ 85721-0119
Yao-Hsien Liu
Turbine Heat Transfer Laboratory, Department of Mechanical Engineering,
Texas A&M University
, College Station, TX 77843-3123
Je-Chin Han
Distinguished Professor and Marcus Easterling Endowed Chair
Turbine Heat Transfer Laboratory, Department of Mechanical Engineering,
Texas A&M University
, College Station, TX 77843-3123e-mail: jc-han@tamu.edu
Sanjay Chopra
Siemens Power Company
, 4400 Alafaya Trail, Orlando, FL 32826J. Heat Transfer. Jul 2008, 130(7): 071701 (11 pages)
Published Online: May 16, 2008
Article history
Received:
February 23, 2007
Revised:
October 31, 2007
Published:
May 16, 2008
Citation
Wright, L. M., Liu, Y., Han, J., and Chopra, S. (May 16, 2008). "Heat Transfer in Trailing Edge, Wedge-Shaped Cooling Channels Under High Rotation Numbers." ASME. J. Heat Transfer. July 2008; 130(7): 071701. https://doi.org/10.1115/1.2907437
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