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Research Papers: Jets, Wakes, and Impingment Cooling

Turbine Blade Leading Edge Cooling With One Row of Normal or Tangential Impinging Jets

[+] Author and Article Information
Nian Wang, Andrew F. Chen, Mingjie Zhang

Turbine Heat Transfer Laboratory,
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843-3123

Je-Chin Han

Turbine Heat Transfer Laboratory,
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843-3123
e-mail: jc-han@tamu.edu

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received April 25, 2017; final manuscript received August 29, 2017; published online March 9, 2018. Assoc. Editor: Danesh K. Tafti.

J. Heat Transfer 140(6), 062201 (Mar 09, 2018) (10 pages) Paper No: HT-17-1229; doi: 10.1115/1.4038691 History: Received April 25, 2017; Revised August 29, 2017

Jet impingement cooling has been extensively used in the leading edge region of a gas turbine blade. This study focuses on the effect of jet impinging position on leading edge heat transfer. The test model is composed of a semicylindrical target plate, side exit slots, and an impingement jet plate. A row of cylindrical injection holes is located along the axis (normal jet) or the edge (tangential jet) of the semicylinder, on the jet plate. The jet-to-target-plate distance to jet diameter ratio (z/d) is 5 and the ratio of jet-to-jet spacing to jet diameter (s/d) is 4. The jet Reynolds number is varied from 10,000 to 30,000. Detailed impingement heat transfer coefficient distributions were experimentally measured by using the transient liquid crystal (TLC) technique. To understand the thermal flow physics, numerical simulations were performed using Reynolds-averaged Navier–Stokes (RANS) with two turbulence models: realizable k–ε (RKE) and shear stress transport k–ω model (SST). Comparisons between the experimental and the numerical results are presented. The results indicate that the local Nusselt numbers on the test surface increase with the increasing jet Reynolds number. The tangential jets provide more uniform heat transfer distributions as compared with the normal jets. For the normal jet impingement and the tangential jet impingement, the RKE model provides better prediction than the SST model. The results can be useful for selecting a jet impinging position in order to provide the proper cooling distribution inside a turbine blade leading edge region.

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References

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Figures

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Fig. 8

(a) Calibration curves for viewing angle 90 deg and (b) calibration curves for viewing angle 45 deg

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Fig. 7

Coordinate transformation from image to surface

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Fig. 6

Curved surface calibration test setup

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Fig. 9

(a) Calibration curves effect at viewing angle 90 deg, (b) calibration curves effect at viewing angle 45 deg, and (c) corrected results of two viewing angles

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Fig. 10

Data comparison with published correlation

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Fig. 11

Computational domain for two cases

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Fig. 13

(a) Liquid crystal image for normal jet impingement at t = 25 s, viewing angle 90 deg and (b) liquid crystal image for tangential jet impingement at t = 45 s, viewing angle 45 deg

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Fig. 12

Comparison of turbulence models at Re = 30,000

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Fig. 14

(a) Detailed Nusselt number distribution for normal jet impingement and (b) detailed Nusselt number distribution for tangential jet impingement

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Fig. 15

(a) Numerical Nu contour for normal jet and (b) numerical Nu contour for tangential jet

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Fig. 17

(a) Spanwise averaged Nu for normal jet and (b) spanwise averaged Nu for tangential jet

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Fig. 16

(a) Velocity contour for normal jet on the YZ plane and (b) velocity contour for tangential jet on the YZ plane

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Fig. 18

(a) Streamwise averaged for Nu normal jet and (b) streamwise averaged Nu for tangential jet

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Fig. 19

(a) CFD and TLC comparison of the normal jet and (b) CFD and TLC comparison of the tangential jet

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Fig. 20

Averaged Nusselt numbers (0 deg < θ < 135 deg)

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Fig. 5

The mainstream temperature variation with time

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Fig. 4

Jet-hole position and flow direction

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Fig. 3

Configuration of jet plate

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Fig. 2

Schematic diagram of the test facility

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Fig. 1

Schematic diagram of the air loop and test setup

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