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Heat/Mass Transfer Measurement Within a Film Cooling Hole of Square and Rectangular Cross Sections

[+] Author Affiliations
Hyung Hee Cho, Seung Goo Kang, Dong Ho Rhee

Yonsei University, Seoul, Korea

Paper No. 2001-GT-0128, pp. V003T01A014; 11 pages
doi:10.1115/2001-GT-0128
From:
  • ASME Turbo Expo 2001: Power for Land, Sea, and Air
  • Volume 3: Heat Transfer; Electric Power; Industrial and Cogeneration
  • New Orleans, Louisiana, USA, June 4–7, 2001
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7852-1
  • Copyright © 2001 by ASME

abstract

An experimental study has been conducted to investigate the heat/mass transfer characteristics within film cooling holes of square and rectangular cross-section. The experiments for this study have been performed using a naphthalene sublimation method, and the flow field has been analyzed by numerical calculation using a commercial code (FLUENT). The rectangular cross-section has the aspect ratio of 2 and the same hydraulic diameter as the square cross-section. A duct flow enters into a film cooling hole in a cross-direction. For the film cooling hole with square cross-section, it is observed that the reattachment of separated flow and the vortices within the hole enhance considerably the heat/mass transfer around the hole entrance region. The heat/mass transfer on the leading edge side of hole exit region increases as the blowing rates decrease because the mainflow induces a secondary vortex. Heat/mass transfer patterns within the film cooling hole are changed slightly with the various Reynolds numbers. For the film cooling hole with rectangular cross-section, overall heat/mass transfer characteristics are similar with those for the square cross-section. However, heat/mass transfer on the leading edge side of hole entrance region has two peak regions due to split flow reattachment, and heat/mass transfer on the leading edge side of hole exit region is less sensitive to the blowing ratios than the square cross-section case.

Copyright © 2001 by ASME

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