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TECHNICAL PAPERS: Experimental Techniques

Heat Transfer Study in a Linear Turbine Cascade Using a Thermal Boundary Layer Measurement Technique

[+] Author and Article Information
S. Han

Department of Mechanical Engineering, Heat Transfer Laboratory, University of Minnesota, Minneapolis, MN 55455

R. J. Goldstein1

Department of Mechanical Engineering, Heat Transfer Laboratory, University of Minnesota, Minneapolis, MN 55455rjg@me.umn.edu

1

Corresponding author.

J. Heat Transfer 129(10), 1384-1394 (Mar 01, 2007) (11 pages) doi:10.1115/1.2754972 History: Received August 06, 2006; Revised March 01, 2007

An experimental system is designed, constructed, and operated to make local measurements of heat transfer from constant-temperature surfaces in a linear turbine cascade. The system includes a number of embedded heaters and a control system to maintain the turbine blades and end walls in the cascade at a uniform temperature. A five-axis measurement system is used to determine temperature profiles normal to the pressure and suction sides of the blades and to the end wall. Extrapolating these measurements close to the surface, the local heat transfer is calculated using Fourier’s law. The system has been tested in the laboratory, and results are shown for the temperature distributions above the surfaces and for the local variations in the Nusselt number on the different surfaces in the cascade. The system can also be used to study the heat and mass transfer analogy as considerable data are available for mass transfer results with similar geometries.

Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Typical thermal boundary layer profile

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Figure 2

Vortex model in turbine cascades Wang (5)

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Figure 3

Test section for the heat transfer experiment

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Figure 4

Blade configuration for the heat transfer experiment

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Figure 5

Constant-temperature end wall with heaters and thermocouples

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Figure 6

Typical cross section of the constant-temperature end wall

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Figure 7

Constant-temperature blade with heaters and thermocouples

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Figure 8

Typical cross section of the constant-temperature blade

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Figure 9

Thermal boundary layer probe schematic (a) for endwall surface, (b) for suction surface, and (c) for pressure surface

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Figure 10

End wall measurement positions

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Figure 11

Blade measurement positions

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Figure 12

Five-axis measurement unit sketch

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Figure 13

Temperature variation of 138 thermocouples on the end wall by PI control

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Figure 14

Thermal boundary layer profile on the blade

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Figure 15

Thermal boundary layer profile on the end wall

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Figure 16

Normalized Nusselt number and Sherwood number plot on the pressure surfaces

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Figure 17

Normalized Nusselt number and Sherwood number plot on the suction surface

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Figure 18

Nusselt number plot on the pressure surfaces at different z∕Cl

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Figure 19

Nusselt number plot on the suction surfaces at different z∕Cl

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Figure 20

Nusselt number contour (HT-run11) on the end wall with Re=2.56×105 and Tu=0.2%

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Figure 21

Nusselt number contour (HT-run13) on the end wall with Re=2.29×105 and Tu=8.5%

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Figure 22

Nusselt number distribution I on the end wall between blades

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Figure 23

Nusselt number distribution II on the end wall between blades

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Figure 24

Nusselt number distribution III on the end wall between blades

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