Tip Leakage Losses in a Linear Turbine Cascade

[+] Author and Article Information
P. T. Dishart, J. Moore

Mechanical Engineering Department, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061

J. Turbomach 112(4), 599-608 (Oct 01, 1990) (10 pages) doi:10.1115/1.2927700 History: Received January 13, 1989; Online June 09, 2008


An investigation of tip leakage flow and its effects on loss production was performed on a large-scale linear turbine cascade having a tip gap measuring 2.1 percent of the blade height. The flow exiting the tip gap was measured to determine the losses incurred within the tip gap and the secondary kinetic energy due to tip leakage. Additional measurements, 40 percent of an axial chord downstream of the blade trailing edges, showed the development of the leakage flow and the overall cascade losses. At the downstream location, the additional loss due to tip leakage was found to be the sum of the measured loss at the tip gap exit plane and the amount of tip gap secondary kinetic energy that had been dissipated by that downstream location.

Copyright © 1990 by The American Society of Mechanical Engineers
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