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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Turbine Blade Leading Edge Cooling With One Row of Normal or Tangential Impinging Jets
Nian Wang,
Nian Wang
Turbine Heat Transfer Laboratory,
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843-3123
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843-3123
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Andrew F. Chen,
Andrew F. Chen
Turbine Heat Transfer Laboratory,
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843-3123
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843-3123
Search for other works by this author on:
Mingjie Zhang,
Mingjie Zhang
Turbine Heat Transfer Laboratory,
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843-3123
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843-3123
Search for other works by this author on:
Je-Chin Han
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
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843-3123
e-mail: jc-han@tamu.edu
Search for other works by this author on:
Nian Wang
Turbine Heat Transfer Laboratory,
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843-3123
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843-3123
Andrew F. Chen
Turbine Heat Transfer Laboratory,
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843-3123
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843-3123
Mingjie Zhang
Turbine Heat Transfer Laboratory,
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843-3123
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
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. Jun 2018, 140(6): 062201 (10 pages)
Published Online: March 9, 2018
Article history
Received:
April 25, 2017
Revised:
August 29, 2017
Citation
Wang, N., Chen, A. F., Zhang, M., and Han, J. (March 9, 2018). "Turbine Blade Leading Edge Cooling With One Row of Normal or Tangential Impinging Jets." ASME. J. Heat Transfer. June 2018; 140(6): 062201. https://doi.org/10.1115/1.4038691
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