Measurements using a novel heat flux sensor were performed in an internal ribbed channel representing the internal cooling passages of a gas turbine blade. These measurements allowed for the characterization of heat transfer turbulence levels and unsteadiness not previously available for internal cooling channels. In the study of heat transfer, often the fluctuations can be equally as important as the mean values for understanding the heat loads in a system. In this study, comparisons are made between the time-averaged values obtained using this sensor and detailed surface measurements using the transient thermal liquid crystal technique. The time-averaged heat flux sensor and transient TLC results showed very good agreement, validating both methods. Time-resolved measurements were also corroborated with hot film measurements at the wall at the location of the sensor to better clarify the influence of unsteadiness in the velocity field at the wall on fluctuations in the heat flux. These measurements resulted in turbulence intensities of the velocity and heat flux of . The velocity and heat flux integral length scales were about 60% and 35% of the channel width, respectively, resulting in a turbulent Prandtl number of at the wall.
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e-mail: sean.jenkins@itlr.uni-stuttgart.de
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January 2008
Research Papers
Time-Resolved Heat Transfer Measurements on the Tip Wall of a Ribbed Channel Using a Novel Heat Flux Sensor—Part II: Heat Transfer Results
Sean Jenkins,
Sean Jenkins
Institute of Aerospace Thermodynamics,
e-mail: sean.jenkins@itlr.uni-stuttgart.de
University of Stuttgart
, Pfaffenwaldring 31, 70569 Stuttgart, Germany
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Jens von Wolfersdorf,
Jens von Wolfersdorf
Institute of Aerospace Thermodynamics,
University of Stuttgart
, Pfaffenwaldring 31, 70569 Stuttgart, Germany
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Bernhard Weigand,
Bernhard Weigand
Institute of Aerospace Thermodynamics,
University of Stuttgart
, Pfaffenwaldring 31, 70569 Stuttgart, Germany
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Tim Roediger,
Tim Roediger
Institute of Aerodynamics and Gas Dynamics,
University of Stuttgart
, Pfaffenwaldring 21, 70569 Stuttgart, Germany
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Helmut Knauss,
Helmut Knauss
Institute of Aerodynamics and Gas Dynamics,
University of Stuttgart
, Pfaffenwaldring 21, 70569 Stuttgart, Germany
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Ewald Kraemer
Ewald Kraemer
Institute of Aerodynamics and Gas Dynamics,
University of Stuttgart
, Pfaffenwaldring 21, 70569 Stuttgart, Germany
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Sean Jenkins
Institute of Aerospace Thermodynamics,
University of Stuttgart
, Pfaffenwaldring 31, 70569 Stuttgart, Germanye-mail: sean.jenkins@itlr.uni-stuttgart.de
Jens von Wolfersdorf
Institute of Aerospace Thermodynamics,
University of Stuttgart
, Pfaffenwaldring 31, 70569 Stuttgart, Germany
Bernhard Weigand
Institute of Aerospace Thermodynamics,
University of Stuttgart
, Pfaffenwaldring 31, 70569 Stuttgart, Germany
Tim Roediger
Institute of Aerodynamics and Gas Dynamics,
University of Stuttgart
, Pfaffenwaldring 21, 70569 Stuttgart, Germany
Helmut Knauss
Institute of Aerodynamics and Gas Dynamics,
University of Stuttgart
, Pfaffenwaldring 21, 70569 Stuttgart, Germany
Ewald Kraemer
Institute of Aerodynamics and Gas Dynamics,
University of Stuttgart
, Pfaffenwaldring 21, 70569 Stuttgart, GermanyJ. Turbomach. Jan 2008, 130(1): 011019 (9 pages)
Published Online: January 28, 2008
Article history
Received:
July 24, 2006
Revised:
September 26, 2006
Published:
January 28, 2008
Connected Content
A companion article has been published:
Time-Resolved Heat Transfer Measurements on the Tip Wall of a Ribbed Channel Using a Novel Heat Flux Sensor—Part I: Sensor and Benchmarks
Citation
Jenkins, S., von Wolfersdorf, J., Weigand, B., Roediger, T., Knauss, H., and Kraemer, E. (January 28, 2008). "Time-Resolved Heat Transfer Measurements on the Tip Wall of a Ribbed Channel Using a Novel Heat Flux Sensor—Part II: Heat Transfer Results." ASME. J. Turbomach. January 2008; 130(1): 011019. https://doi.org/10.1115/1.2472417
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