Shaped film cooling holes have become a standard geometry for protecting gas turbine components. Few studies, however, have reported flowfield measurements for moderately expanded shaped holes and even fewer have reported on the effects of high freestream turbulence intensity relevant to gas turbine airfoils. This study presents detailed flowfield and adiabatic effectiveness measurements for a shaped hole at freestream turbulence intensities of 0.5% and 13%. Test conditions included blowing ratios of 1.5 and 3 at a density ratio of 1.5. Measured flowfields revealed a counter-rotating vortex pair (CRVP) and high jet penetration into the mainstream at the blowing ratio of 3. Elevated freestream turbulence had a minimal effect on mean velocities and rather acted by increasing turbulence intensity around the coolant jet, resulting in increased lateral spreading of coolant.
Effect of High Freestream Turbulence on Flowfields of Shaped Film Cooling Holes
Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received November 20, 2015; final manuscript received December 13, 2015; published online April 5, 2016. Editor: Kenneth C. Hall.
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Schroeder, R. P., and Thole, K. A. (April 5, 2016). "Effect of High Freestream Turbulence on Flowfields of Shaped Film Cooling Holes." ASME. J. Turbomach. September 2016; 138(9): 091001. https://doi.org/10.1115/1.4032736
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