Rotor-Tip Leakage: Part I—Basic Methodology

[+] Author and Article Information
T. C. Booth, P. R. Dodge

Garrett Turbine Engine Co., Phoenix, Arz. 85010

H. K. Hepworth

Northern Arizona University, Flagstaff, Arz. 86001

J. Eng. Power 104(1), 154-161 (Jan 01, 1982) (8 pages) doi:10.1115/1.3227244 History: Received December 11, 1980; Online September 28, 2009


Blade tip losses represent a major efficiency penalty in a turbine rotor. These losses are presently controlled by maintaining close tolerances on tip clearances. This two-part paper outlines a new methodology for predicting and minimizing tip leakage flows. Part I of the paper describes a series of experiments and analyses which indicated a predominantly inviscid nature of tip leakage flow. The experiments were conducted on a series of three water flow rigs in which leakage quantities were measured over simulated blade tips. As a result of the experiments, a simple tip-leakage model is proposed that treats the normal velocity component in terms of discharge coefficient and conserves the tangential velocity (momentum) component. Identification of tip leakage controlled by a normal discharge coefficient suggests an optimum tip-treatment configuration may be designed through discharge testing of candidate configurations. A preliminary design optimization was conducted on the simple discharge rigs, and the results were evaluated on the water table cascade rig and on a turbine stage.

Copyright © 1982 by ASME
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