0

Mass Transfer Effects of Free-Stream Turbulence and Horseshoe Vortex Formed at the Upstream Edge of Film Cooling Jets About a Cylindrical Surface FREE

[+] Author Affiliations
Joon Sik Lee, Sung Tack Ro, Hyeong Joon Seo

Seoul National University, Seoul, Korea

Paper No. 94-GT-018, pp. V004T09A006; 9 pages
doi:10.1115/94-GT-018
From:
  • ASME 1994 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 4: Heat Transfer; Electric Power; Industrial and Cogeneration
  • The Hague, Netherlands, June 13–16, 1994
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7886-6
  • Copyright © 1994 by ASME

abstract

The leading edge of a turbine blade was simulated as a circular cylindrical surface. The effect of free-stream turbulence on the mass transfer upstream edge of the injection hole normal to the cylindrical surface has been investigated by using a naphthalene sublimation technique. The effects of injection location, blowing ratio on the Sherwood number distribution were examined as well. The free-stream Reynolds number based on the cylinder diameter is 53,000 and other conditions investigated are: free-stream turbulence intensities of 0.5%, 3.9% and 8.0%, injection locations of 40, 50 and 60 degrees from the front stagnation point of the cylinder, and blowing ratios of 0.5 and 1.0. The role of the horseshoe vortex formed upstream edge of the normally injected jet is discussed in detail. When the coolant jet is injected at 40 degrees, the mass transfer upstream of the jet is not affected by the coolant jet at all. On the other hand, when the injection hole is located beyond 50 degrees the mass transfer upstream edge of the injection hole suddenly increases due to the formation of the horseshoe vortex, but it decreases as the free-stream turbulence intensity increases because the strength of the horseshoe vortex structure is weakened. The role of the horseshoe vortex is confirmed by placing a rigid rod at the injection hole instead of issuing the jet. In the case of the rigid rod, the Sherwood number upstream of the injection hole is much larger due to the intense influence of the horseshoe vortex. The variation in the strength of the horseshoe vortex structure with free-stream turbulence intensities was observed by a flow visualization.

Copyright © 1994 by ASME
This article is only available in the PDF format.

Figures

Tables

Interactive Graphics

Video

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

NOTE:
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.

Related eBook Content
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