The influence of freestream turbulence representative of the flow downstream of a modern gas turbine combustor and first stage vane on turbine blade heat transfer has been measured and analytically modeled in a linear, transonic turbine cascade. High-intensity, large length-scale freestream turbulence was generated using a passive turbulence-generating grid to simulate the turbulence generated in modern combustors after passing through the first stage vane row. The grid produced freestream turbulence with intensity of approximately 10–12% and an integral length scale of near the entrance of the cascade passages. Mean heat transfer results with high turbulence showed an increase in heat transfer coefficient over the baseline low turbulence case of approximately 8% on the suction surface of the blade, with increases on the pressure surface of approximately 17%. Time-resolved surface heat transfer and passage velocity measurements demonstrate strong coherence in velocity and heat flux at a frequency correlating with the most energetic eddies in the turbulence flow field (the integral length scale). An analytical model was developed to predict increases in surface heat transfer due to freestream turbulence based on local measurements of turbulent velocity fluctuations and length scale. The model was shown to predict measured increases in heat flux on both blade surfaces in the current data. The model also successfully predicted the increases in heat transfer measured in other work in the literature, encompassing different geometries (flat plate, cylinder, turbine vane, and turbine blade) and boundary layer conditions.
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e-mail: andrew.nix@mail.wvu.edu
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July 2007
Technical Papers
Experimental Measurements and Modeling of the Effects of Large-Scale Freestream Turbulence on Heat Transfer
A. C. Nix,
A. C. Nix
Department of Mechanical and Aerospace Engineering,
e-mail: andrew.nix@mail.wvu.edu
West Virginia University
, Morgantown, WV 26506-6106
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T. E. Diller,
T. E. Diller
Fellow ASME
Department of Mechanical Engineering,
Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061
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W. F. Ng
W. F. Ng
Fellow ASME
Department of Mechanical Engineering,
Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061
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A. C. Nix
Department of Mechanical and Aerospace Engineering,
West Virginia University
, Morgantown, WV 26506-6106e-mail: andrew.nix@mail.wvu.edu
T. E. Diller
Fellow ASME
Department of Mechanical Engineering,
Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061
W. F. Ng
Fellow ASME
Department of Mechanical Engineering,
Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061J. Turbomach. Jul 2007, 129(3): 542-550 (9 pages)
Published Online: October 5, 2006
Article history
Received:
March 3, 2006
Revised:
October 5, 2006
Citation
Nix, A. C., Diller, T. E., and Ng, W. F. (October 5, 2006). "Experimental Measurements and Modeling of the Effects of Large-Scale Freestream Turbulence on Heat Transfer." ASME. J. Turbomach. July 2007; 129(3): 542–550. https://doi.org/10.1115/1.2515555
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