0

Full Content is available to subscribers

Subscribe/Learn More  >

Unsteady Effects on Transonic Turbine Blade-Tip Heat Transfer

[+] Author Affiliations
N. R. Atkins

University of Sussex, Sussex, UK

S. J. Thorpe

University Loughborough, Loughborough, UK

R. W. Ainsworth

University of Oxford, Oxford, UK

Paper No. GT2008-51177, pp. 1025-1038; 14 pages
doi:10.1115/GT2008-51177
From:
  • ASME Turbo Expo 2008: Power for Land, Sea, and Air
  • Volume 4: Heat Transfer, Parts A and B
  • Berlin, Germany, June 9–13, 2008
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4314-7 | eISBN: 0-7918-3824-2
  • Copyright © 2008 by ASME

abstract

In a gas turbine engine the blade-tips of the high-pressure turbine are exposed to high levels of convective heat transfer due to the so-called tip-leakage phenomenon. The blade-lift distribution is known to control the flow distribution in the blade tip-gap. However, the interaction between upstream nozzle guide vanes and the rotor blades produces a time-varying flow field that induces varying flow conditions around the blade and within the tip-gap. Extensive measurements of the unsteady blade-tip heat transfer have been made in an engine representative transonic turbine. These include measurements along the mean camber line of the blade-tip which have revealed significant variation in both time-mean and time-varying heat flux. The influences of potential interaction and the vane trailing edge have been observed. Numerical calculations of the turbine stage using a Reynolds averaged Navier-Stokes based computational fluid dynamics code have also been conducted. In combination with the experimental results these have enabled the time-varying flow-field to be probed in the blade-relative frame of reference. This has allowed a deeper analysis of the unsteady heat transfer data, and the quantification of the impact of vane potential field and vane trailing edge interaction on the tip-region flow and heat transfer. In particular, the separate effects of time-varying flow temperature and heat transfer coefficient have been established.

Copyright © 2008 by ASME

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