Methods of Predicting the Tip Clearance Effects in Axial Flow Turbomachinery

[+] Author and Article Information
B. Lakshminarayana

The Pennsylvania State University, University Park, Pa.

J. Basic Eng 92(3), 467-480 (Sep 01, 1970) (14 pages) doi:10.1115/1.3425036 History: Received August 01, 1969; Online October 27, 2010


Using the author’s earlier flow model for the tip clearance flow, an expression is derived for the decrease in stage efficiency due to tip clearance. The analysis which includes all the dominant flow and blade parameters that affect the flow in the clearance region is compatible with fundamental physical principles, though not precise mathematically. The predictions agree closely with several compressor, fan, pump, and turbine data available. An alternate model which takes into account the presence of the vortex core is proposed. The theoretical treatment of the flow, more complete than hitherto available, predicts blade-to-blade variation in outlet angles accurately and stagnation pressure losses qualitatively. The predictions are compared with various experimental data available in the literature.

Copyright © 1970 by ASME
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