The Effects of Hole Arrangement and Density Ratio on the Heat Transfer Coefficient Augmentation of Fan-Shaped Film Cooling Holes

Young Seo Kim, Jin Young Jeong, Jae Su Kwak and Heeyoon Chung
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Young Seo Kim: School of Aerospace and Mechanical Engineering, Korea Aerospace University, Goyang 10540, Korea
Jin Young Jeong: School of Aerospace and Mechanical Engineering, Korea Aerospace University, Goyang 10540, Korea
Jae Su Kwak: School of Aerospace and Mechanical Engineering, Korea Aerospace University, Goyang 10540, Korea
Heeyoon Chung: Aeropropulsion Division, Korea Aerospace Research Institute, Daejeon 34133, Korea

Energies, 2021, vol. 14, issue 1, 1-16

Abstract: An experimental study was performed to investigate the effects of the arrangement of fan-shaped film cooling holes and density ratio (DR) on heat transfer coefficient augmentation. Both single- and multi-row fan-shaped film cooling holes were considered. For the multi-row fan-shaped holes, the heat transfer coefficient was measured at DRs of 1 and 2, and both staggered and inline arrangements of holes were considered. For the single-row fan-shaped holes, DR = 1.0, 1.5, 2.0, and 2.5 and M = 1.0 and 2.0 conditions were tested. The mainstream velocity was 20 m/s, and the turbulence intensity and boundary layer thickness were 3.6% and 6 mm, respectively. The heat transfer coefficient was measured using the one-dimensional transient infrared thermography method. The results show that an increased heat transfer coefficient augmentation is observed between film cooling holes for the case with a smaller hole pitch and higher blowing ratio. For the given fan-shaped hole parameters, the effects of the row-to-row distance and hole arrangement are not significant. In addition, as the velocity difference between the mainstream and coolant increases, the heat transfer coefficient ratio increases.

Keywords: gas turbine; film cooling; heat transfer coefficient; IR thermography (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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