Measurements of the Tip-Leakage Flow in a Turbine Cascade With Large Clearances PUBLIC ACCESS

[+] Author Affiliations
S. De Cecco, M. I. Yaras, S. A. Sjolander

Carleton University, Ottawa, ON, Canada

Paper No. 95-GT-077, pp. V001T01A009; 12 pages
  • ASME 1995 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 1: Turbomachinery
  • Houston, Texas, USA, June 5–8, 1995
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7878-1
  • Copyright © 1995 by ASME


Measurements have been made for tip clearances up to 15% of chord in a turbine cascade which has been used previously to study the tip-leakage flow at smaller clearances. The work is part of a study of the aerodynamics of turbines which have experienced in-service damage and is related to Engine Health Monitoring. Detailed flow field measurements have been made upstream and downstream of the cascade and static pressure distributions have been measured on the endwall and at the midspan of the blade. The most unexpected result was that the blade end losses (that is, the sum of the secondary and tip-leakage losses) reached a maximum for a clearance of about 6% of chord. At the largest clearance of 15%, the end losses were substantially reduced and were in fact comparable with the secondary losses measured for zero clearance. The paper discusses in some detail the physics of the flow and the reasons for the observed reduction in losses. The pressure difference across the gap was found to be considerably attenuated at the largest clearance. This would have the effect of reducing the mass flow rate per unit area through the gap as well as the kinetic energy of the gap flow. These effects appear to account for a large part of the reduction in losses. As might be expected, the turning of the flow near the endwall was considerably reduced at the large clearances.

Copyright © 1995 by ASME
This article is only available in the PDF format.



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.

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