This study investigated the adiabatic wall cooling effectiveness of a single row of film cooling holes injecting into a turbulent flat plate boundary layer below a turbulent, zero pressure gradient free stream. Levels of free-stream turbulence (Tu) up to 17.4 percent were generated using a method that simulates conditions at a gas turbine combustor exit. Film cooling was injected from a single row of five 35 deg slant-hole injectors (length/diameter = 3.5, pitch/diameter = 3.0) at blowing ratios from 0.55 to 1.85 and at a nearly constant density ratio (coolant density/free-stream density) of 0.95. Film cooling effectiveness data are presented for Tu levels ranging from 0.9 to 17 percent at a constant free-stream Reynolds number based on injection hole diameter of 19,000. Results show that elevated levels of free-stream turbulence reduce film cooling effectiveness by up to 70 percent in the region directly downstream of the injection hole due to enhanced mixing. At the same time, high free-stream turbulence also produces a 50–100 percent increase in film cooling effectiveness in the region between injection holes. This is due to accelerated spanwise diffusion of the cooling fluid, which also produces an earlier merger of the coolant jets from adjacent holes.
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October 1996
Research Papers
The Effect of High Free-Stream Turbulence on Film Cooling Effectiveness Available to Purchase
J. P. Bons,
J. P. Bons
Aero Propulsion and Power Directorate, US Air Force Wright Laboratory, Wright-Patterson AFB, OH 45433
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C. D. MacArthur,
C. D. MacArthur
Aero Propulsion and Power Directorate, US Air Force Wright Laboratory, Wright-Patterson AFB, OH 45433
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R. B. Rivir
R. B. Rivir
Aero Propulsion and Power Directorate, US Air Force Wright Laboratory, Wright-Patterson AFB, OH 45433
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J. P. Bons
Aero Propulsion and Power Directorate, US Air Force Wright Laboratory, Wright-Patterson AFB, OH 45433
C. D. MacArthur
Aero Propulsion and Power Directorate, US Air Force Wright Laboratory, Wright-Patterson AFB, OH 45433
R. B. Rivir
Aero Propulsion and Power Directorate, US Air Force Wright Laboratory, Wright-Patterson AFB, OH 45433
J. Turbomach. Oct 1996, 118(4): 814-825 (12 pages)
Published Online: October 1, 1996
Article history
Received:
February 16, 1994
Online:
January 29, 2008
Citation
Bons, J. P., MacArthur, C. D., and Rivir, R. B. (October 1, 1996). "The Effect of High Free-Stream Turbulence on Film Cooling Effectiveness." ASME. J. Turbomach. October 1996; 118(4): 814–825. https://doi.org/10.1115/1.2840939
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