The present study is an experimental investigation of film cooling from cylindrical holes embedded in transverse trenches. Different trench depths are considered with two trench widths. Trench holes can occur when blades are coated with thermal barrier coating (TBC) layers. The film hole performance and behavior will be different for the trench holes compared to standard cylindrical holes that are flush with the surface. The trench width and depth depends on the mask region and the thickness of the TBC layer. Detailed heat transfer coefficient and film effectiveness measurements are obtained simultaneously using a single test transient IR thermography technique. The study is performed at a single mainstream Reynolds number based on free-stream velocity and film hole diameter of 11000 at four different coolant-to-mainstream blowing ratios of 0.5, 1.0, 1.5 and 2.0. The results show that film effectiveness is greatly enhanced by the trenching due to improved two dimensional nature of the film and lateral spreading. The detailed heat transfer coefficient and film effectiveness contours provide a clear understanding of the jet-mainstream interactions for different hole orientations. CFD simulation using Fluent was also performed to determine the jet mainstream interactions to better understand the surface heat transfer coefficient and film effectiveness distributions.
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ASME Turbo Expo 2007: Power for Land, Sea, and Air
May 14–17, 2007
Montreal, Canada
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
0-7918-4793-4
PROCEEDINGS PAPER
Effect of Trench Width and Depth on Film Cooling From Cylindrical Holes Embedded in Trenches
Yiping Lu,
Yiping Lu
Louisiana State University, Baton Rouge, LA
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Alok Dhungel,
Alok Dhungel
Louisiana State University, Baton Rouge, LA
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Srinath V. Ekkad,
Srinath V. Ekkad
Louisiana State University, Baton Rouge, LA
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Ronald S. Bunker
Ronald S. Bunker
GE Global Research Center, Niskayuna, NY
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Yiping Lu
Louisiana State University, Baton Rouge, LA
Alok Dhungel
Louisiana State University, Baton Rouge, LA
Srinath V. Ekkad
Louisiana State University, Baton Rouge, LA
Ronald S. Bunker
GE Global Research Center, Niskayuna, NY
Paper No:
GT2007-27388, pp. 339-349; 11 pages
Published Online:
March 10, 2009
Citation
Lu, Y, Dhungel, A, Ekkad, SV, & Bunker, RS. "Effect of Trench Width and Depth on Film Cooling From Cylindrical Holes Embedded in Trenches." Proceedings of the ASME Turbo Expo 2007: Power for Land, Sea, and Air. Volume 4: Turbo Expo 2007, Parts A and B. Montreal, Canada. May 14–17, 2007. pp. 339-349. ASME. https://doi.org/10.1115/GT2007-27388
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