Effect of high freestream turbulence on flowfields of shaped film cooling holes

Robert P. Schroeder, Karen Ann Thole

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

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 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.

Original languageEnglish (US)
Title of host publicationHeat Transfer
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791856727, 9780791856727
DOIs
Publication statusPublished - Jan 1 2015
EventASME Turbo Expo 2015: Turbine Technical Conference and Exposition, GT 2015 - Montreal, Canada
Duration: Jun 15 2015Jun 19 2015

Publication series

NameProceedings of the ASME Turbo Expo
Volume5B

Other

OtherASME Turbo Expo 2015: Turbine Technical Conference and Exposition, GT 2015
CountryCanada
CityMontreal
Period6/15/156/19/15

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All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Schroeder, R. P., & Thole, K. A. (2015). Effect of high freestream turbulence on flowfields of shaped film cooling holes. In Heat Transfer (Proceedings of the ASME Turbo Expo; Vol. 5B). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/GT2015-43339