The KSFM Journal of Fluid Machinery (한국유체기계학회 논문집)

Korean Society for Fluid machinery (한국유체기계학회)
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Improvement of Film Cooling Performance of a Slot on a Flat Plate Using Coanda Effect

코안다 효과를 이용한 평판 슬롯의 막냉각 성능 향상

  • Kim, Gi Mun (School of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Kim, Ye Jee (School of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Kwak, Jae Su (School of Aerospace and Mechanical Engineering, Korea Aerospace University)
  • 김기문 (한국항공대학교 항공우주 및 기계공학부) ;
  • 김예지 (한국항공대학교 항공우주 및 기계공학부) ;
  • 곽재수 (한국항공대학교 항공우주 및 기계공학부)
  • Received : 2016.10.04
  • Accepted : 2016.11.10
  • Published : 2017.04.01
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Abstract

In this study, the Coanda effect inducing bump was applied to improve the film cooling effectiveness on the flat plate with $30^{\circ}$ and $45^{\circ}$ angled rectangular slots. The slot length to width ratio was 6. A cylindrical cap shaped structure, called Coanda bump, was installed at the exit of the slot to generate Coanda effect. The width and height of the bump was 10.5 mm and 1 mm, respectively. The film cooling effectiveness was measured at the fixed blowing ratio, M=2.0, using pressure sensitive paint (PSP) technique. The mainstream velocity was 10 m/s and the turbulence intensity was about 0.5%. Results showed that the film cooling effectiveness for case of $30^{\circ}$ angled slot was higher than that of $45^{\circ}$ angled slot. It was found that there was no positive effect of Coanda effect on the overall averaged film cooling effectiveness for the $30^{\circ}$ angled slot. On the other hand, for the $45^{\circ}$ angled slot, the film cooling effectiveness was improved with the installation of the Coanda bump.

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References

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