The performance of film cooling designs is typically quantified by the adiabatic effectiveness, with results presented in terms of non-dimensional parameters such as the blowing ratio, momentum flux ratio, or velocity ratio of the coolant to the overflowing mainstream gas. In order to appropriately model experimental film cooling designs, the correct coolant flow parameter should be selected. In this work, a single row of axial round holes and shaped holes were placed in a flat plate and tested within a recirculating wind tunnel at low speeds and temperatures. Mainstream turbulence intensity and boundary layer thickness were set similar to expected engine conditions. The density ratio of the coolant was varied from 1.2 to 1.6 in order to independently vary the parameters listed above, which were tested at six different conditions for each density ratio. High-resolution IR thermography was used to measure adiabatic effectiveness downstream of the single row of cooling holes. The results indicate that adiabatic effectiveness performance of cylindrical and shaped holes are scaled most effectively using velocity ratio, providing much more accurate results then when the blowing ratio is used.
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ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
June 15–19, 2015
Montreal, Quebec, Canada
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5672-7
PROCEEDINGS PAPER
Experimental Investigation of Coolant-to-Mainstream Scaling Parameters With Cylindrical and Shaped Film Cooling Holes
Joshua B. Anderson,
Joshua B. Anderson
The University of Texas at Austin, Austin, TX
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Emily J. Boyd,
Emily J. Boyd
The University of Texas at Austin, Austin, TX
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David G. Bogard
David G. Bogard
The University of Texas at Austin, Austin, TX
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Joshua B. Anderson
The University of Texas at Austin, Austin, TX
Emily J. Boyd
The University of Texas at Austin, Austin, TX
David G. Bogard
The University of Texas at Austin, Austin, TX
Paper No:
GT2015-43072, V05BT12A033; 14 pages
Published Online:
August 12, 2015
Citation
Anderson, JB, Boyd, EJ, & Bogard, DG. "Experimental Investigation of Coolant-to-Mainstream Scaling Parameters With Cylindrical and Shaped Film Cooling Holes." Proceedings of the ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. Volume 5B: Heat Transfer. Montreal, Quebec, Canada. June 15–19, 2015. V05BT12A033. ASME. https://doi.org/10.1115/GT2015-43072
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