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

[+] Author and Article Information
F. J. G. Heyes, H. P. Hodson

Whittle Laboratory, Cambridge University, Cambridge CB3 ODY, United Kingdom

G. M. Dailey

Rolls Royce plc, Derby, United Kingdom

J. Turbomach 114(3), 643-651 (Jul 01, 1992) (9 pages) doi:10.1115/1.2929188 History: Received February 20, 1991; Online June 09, 2008


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 © 1992 by The American Society of Mechanical Engineers
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