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The Effect of Blade Tip Geometry on the Tip Leakage Flow in Axial Turbine Cascades PUBLIC ACCESS

[+] Author Affiliations
F. J. G. Heyes, H. P. Hodson

Cambridge University, Cambridge, England

G. M. Dailey

Rolls Royce PLC, Derby, England

Paper No. 91-GT-135, pp. V001T01A052; 9 pages
doi:10.1115/91-GT-135
From:
  • ASME 1991 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 1: Turbomachinery
  • Orlando, Florida, USA, June 3–6, 1991
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7898-9
  • Copyright © 1991 by ASME

abstract

The phenomenon of tip leakage has been studied in two linear cascades of turbine blades.The investigation includes an examination of the performance of the cascades with a variety of tip geometries. The effects of using plain tips, suction side squealers and pressure side squealers are reported. Traverses of the exit flow field were made in order to determine the overall performance.

A method of calculating the tip discharge coefficients for squealer geometries is put forward. In linking the tip discharge coefficient and cascade losses a procedure for predicting the relative performance of tip geometries is developed. The model is used to examine the results obtained using the different tip treatments and to highlight the important aspects of the loss generation process.

Copyright © 1991 by ASME
This article is only available in the PDF format.

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