Measurement and Prediction of Tip Clearance Flow in Linear Turbine Cascades

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

Whittle Laboratory, Cambridge University, Engineering Department, Cambridge, CB3 0DY United Kingdom

J. Turbomach 115(3), 376-382 (Jul 01, 1993) (7 pages) doi:10.1115/1.2929264 History: Received February 20, 1992; Online June 09, 2008


This paper describes a simple two-dimensional model for the calculation of the leakage flow over the blade tips of axial turbines. The results obtained from calculations are compared with data obtained from experimental studies of two linear turbine cascades. One of these cascades has been investigated by the authors and previously unpublished experimental data are provided for comparison with the model. In each of the test cases examined, excellent agreement is obtained between the experimental and predicted data. Although ignored in the past, the importance of pressure gradients along the blade chord is highlighted as a major factor influencing the tip leakage flow.

Copyright © 1993 by The American Society of Mechanical Engineers
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