Full Content is available to subscribers

Subscribe/Learn More  >

Film Cooling From a Single Row of Cylindrical Angled Holes With Triangular Tabs Having Different Orientations

[+] Author Affiliations
Hasan Nasir, Sumanta Acharya, Srinath Ekkad

Louisiana State University, Baton Rouge, LA

Paper No. 2001-GT-0124, pp. V003T01A011; 8 pages
  • 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


The effect of discrete delta (or triangular)-shaped tabs with different orientations on the film cooling performance from a row of cylindrical holes is investigated. The holes are inclined at 35° along the streamwise direction and the tabs are located along the upstream edge of the holes. Three tab orientations are investigated: (1) tabs placed parallel to the film cooled surface covering a part of the hole; (2) tabs oriented downward at –45 degrees; and (3) tabs oriented upwards at 45 degrees. Measurements were carried out in a low-speed wind tunnel using the transient liquid crystal technique. The mainstream velocity and free-stream turbulence intensity in the low speed wind tunnel are 9 m/s and 7% respectively and the mainstream Reynolds number based on hole diameter is around 7,100. Three blowing ratios of 0.56, 1.13, and 1.7 are tested. Results show that the tabs oriented horizontally and those oriented downward provides the highest film effectiveness at blowing ratios of 0.56 and 1.13. At blowing ratio of 1.7, the horizontal tabs have the highest effectiveness. The higher effectiveness (200-300%) and higher heat transfer coefficient (25-30%) with the tabs are caused due to the generation of secondary eddies counter-rotating with respect to the kidney pair; these eddies reduce jet penetration and thus increase film cooling effectiveness.

Copyright © 2001 by ASME
Topics: Film cooling



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In