An advanced, high-effectiveness film cooling design, the antivortex hole (AVH) has been investigated by several research groups and shown to mitigate or counter the vorticity generated by conventional holes and increase film effectiveness at high blowing ratios and low freestream turbulence levels. The effects of increased turbulence on an AVH geometry were previously investigated in a preliminary steady computational fluid dynamics (CFD) study by Hunley et al. on the film effectiveness and net heat flux reduction (NHFR) at high blowing ratio. The current paper presents the results of an extended numerical parametric study, which attempts to separate the effects of turbulence intensity and length scale on film cooling performance of the AVH concept at high blowing ratio (2.0) and density ratio (2.0). In this extended study, steady Reynolds-averaged Navier–Stokes (RANS) analysis was performed with turbulence intensities of 5, 10, and 20% and length scales based on cooling hole diameter of Λx/dm = 1, 3, and 6. Increasing turbulence intensity was shown to increase the centerline, span-averaged, and area-averaged adiabatic film cooling effectiveness and NHFR. Larger turbulent length scales in the steady RANS analysis were shown to have little to no effect on the centerline, span-averaged, and area-averaged adiabatic film cooling effectiveness and NHFR at lower turbulence levels, but moderate effect at the highest turbulence levels investigated. Heat transfer results were in good agreement with the findings from adiabatic cases from previous work. Unsteady RANS results also provided supplementary flow visualization for the AVH film cooling flow under varying turbulence levels.
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March 2017
Research-Article
Numerical Study on the Effects of Freestream Turbulence on Antivortex Film Cooling Design at High Blowing Ratio
Timothy W. Repko,
Timothy W. Repko
Department of Mechanical and
Aerospace Engineering,
West Virginia University,
Morgantown, WV 26505
Aerospace Engineering,
West Virginia University,
Morgantown, WV 26505
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Andrew C. Nix,
Andrew C. Nix
Department of Mechanical and
Aerospace Engineering,
West Virginia University,
Morgantown, WV 26505
Aerospace Engineering,
West Virginia University,
Morgantown, WV 26505
Search for other works by this author on:
Can Uysal,
Can Uysal
Department of Mechanical and
Aerospace Engineering,
West Virginia University,
Morgantown, WV 26505
e-mail: andrew.nix@mail.wvu.edu
Aerospace Engineering,
West Virginia University,
Morgantown, WV 26505
e-mail: andrew.nix@mail.wvu.edu
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James D. Heidmann
James D. Heidmann
Turbomachinery and Heat Transfer Branch,
NASA Glenn Research Center,
Cleveland, OH 44135
e-mail: heidmann@nasa.gov
NASA Glenn Research Center,
Cleveland, OH 44135
e-mail: heidmann@nasa.gov
Search for other works by this author on:
Timothy W. Repko
Department of Mechanical and
Aerospace Engineering,
West Virginia University,
Morgantown, WV 26505
Aerospace Engineering,
West Virginia University,
Morgantown, WV 26505
Andrew C. Nix
Department of Mechanical and
Aerospace Engineering,
West Virginia University,
Morgantown, WV 26505
Aerospace Engineering,
West Virginia University,
Morgantown, WV 26505
Can Uysal
Department of Mechanical and
Aerospace Engineering,
West Virginia University,
Morgantown, WV 26505
e-mail: andrew.nix@mail.wvu.edu
Aerospace Engineering,
West Virginia University,
Morgantown, WV 26505
e-mail: andrew.nix@mail.wvu.edu
James D. Heidmann
Turbomachinery and Heat Transfer Branch,
NASA Glenn Research Center,
Cleveland, OH 44135
e-mail: heidmann@nasa.gov
NASA Glenn Research Center,
Cleveland, OH 44135
e-mail: heidmann@nasa.gov
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received December 21, 2015; final manuscript received August 4, 2016; published online November 8, 2016. Assoc. Editor: Srinath V. Ekkad.This work is in part a work of the U.S. Government. ASME disclaims all interest in the U.S. Government's contributions.
J. Thermal Sci. Eng. Appl. Mar 2017, 9(1): 011013 (12 pages)
Published Online: November 8, 2016
Article history
Received:
December 21, 2015
Revised:
August 4, 2016
Citation
Repko, T. W., Nix, A. C., Uysal, C., and Heidmann, J. D. (November 8, 2016). "Numerical Study on the Effects of Freestream Turbulence on Antivortex Film Cooling Design at High Blowing Ratio." ASME. J. Thermal Sci. Eng. Appl. March 2017; 9(1): 011013. https://doi.org/10.1115/1.4034851
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