Gas turbine components subjected to high temperatures can benefit from improved designs enabled by metal additive manufacturing with nickel alloys. Previous studies have shown that the impact on fluid flow and heat transfer resulting from surface roughness of additively manufactured parts is significant; these impacts must be understood to design turbine components successfully for additive manufacturing. This study improves understanding of these impacts by examining the discharge coefficient and the effect of the coolant delivery direction on the performance of additively manufactured shaped film cooling holes. To accomplish this, five test coupons containing a row of baseline shaped film cooling holes were made from a high temperature nickel alloy using a laser powder bed fusion process. Flow and pressure drop measurements across the holes were collected to determine the discharge coefficient from the film cooling holes. Temperature measurements were collected to assess the overall effectiveness of the coupon surface as well as the cooling enhancement due to film cooling. The Biot number of the coupon wall was matched to a value one might find in a turbine engine to ensure this data is relevant. It was discovered that the flow experienced greater aerodynamic losses in film cooling holes with greater relative roughness, which resulted in a decreased discharge coefficient. The effectiveness measurements showed that the film cooling performance is better when coolant is fed in a co-flow configuration compared to a counter-flow configuration.
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ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition
June 11–15, 2018
Oslo, Norway
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5109-8
PROCEEDINGS PAPER
Effects of Coolant Feed Direction on Additively Manufactured Film Cooling Holes
Curtis K. Stimpson,
Curtis K. Stimpson
Pennsylvania State University, University Park, PA
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Jacob C. Snyder,
Jacob C. Snyder
Pennsylvania State University, University Park, PA
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Karen A. Thole,
Karen A. Thole
Pennsylvania State University, University Park, PA
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Dominic Mongillo
Dominic Mongillo
Pratt & Whitney, East Hartford, CT
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Curtis K. Stimpson
Pennsylvania State University, University Park, PA
Jacob C. Snyder
Pennsylvania State University, University Park, PA
Karen A. Thole
Pennsylvania State University, University Park, PA
Dominic Mongillo
Pratt & Whitney, East Hartford, CT
Paper No:
GT2018-77287, V05BT21A005; 12 pages
Published Online:
August 30, 2018
Citation
Stimpson, CK, Snyder, JC, Thole, KA, & Mongillo, D. "Effects of Coolant Feed Direction on Additively Manufactured Film Cooling Holes." Proceedings of the ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. Volume 5B: Heat Transfer. Oslo, Norway. June 11–15, 2018. V05BT21A005. ASME. https://doi.org/10.1115/GT2018-77287
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