Aerothermodynamics

Film-Cooling Performance with Various Hole Length to Diameter Ratios for Cylindrical and Laidback Fan-Shaped Holes with an Inlet Groove

  • PARK Jisu ,
  • KIM Jun-Hee ,
  • KANG Changwoo
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  • 1. Department of Mechanical Engineering, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do, 54896, Republic of Korea
    2. Research Institute of Industrial Science & Technology 187-12 Geumho-ro, Gwangyang-si, Jeollanam-do, 57801, Republic of Korea
    3. Laboratory for Renewable Energy and Sector Coupling, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do, 54896, Republic of Korea

Online published: 2025-03-05

Supported by

This research was supported by National University Development Project at Jeonbuk National University in 2023.

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024

Abstract

The influence of the hole length-to-diameter ratio on film-cooling performance is numerically investigated for a cylindrical hole and laidback fan-shaped hole with an inlet groove. Numerical analysis of film-cooling is conducted by solving three-dimensional Reynolds-averaged Navier-Stokes equations (RANS) with a Realizable k-ε turbulence model. Rectangular and triangular grooves are applied to the inlet of cylindrical and laidback fan-shaped holes. The ratio of the hole length (L) to the diameter (D), i.e., L/D, is varied between 6–12 at blowing ratios (M) of 0.5 to 1.5 for the cylindrical hole and 0.5 to 3.0 for the laidback fan-shaped hole. For cylindrical holes with an inlet groove, the film-cooling effectiveness decreases as the L/D increases, regardless of the blowing ratio. However, in the case of laidback fan-shaped holes, the cooling performance with the length-to-diameter ratios shows different tendencies for each blowing ratio. At low blowing ratios (M=1.0), relatively high effects were observed with more than 5% increases in the effectiveness at L/D=10 and 12 compared to that of L/D=6. However, the performance is maximized at L/D=8 under high-blowing-ratio conditions (M=3.0). The cooling efficiency is enhanced up to 148% for square grooves and 124% for triangle grooves compared to those of L/D=6.

Cite this article

PARK Jisu , KIM Jun-Hee , KANG Changwoo . Film-Cooling Performance with Various Hole Length to Diameter Ratios for Cylindrical and Laidback Fan-Shaped Holes with an Inlet Groove[J]. Journal of Thermal Science, 2025 , 34(2) : 607 -625 . DOI: 10.1007/s11630-024-2060-7

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