Flow Phenomena in Compressor Casing Treatment

[+] Author and Article Information
G. D. J. Smith, N. A. Cumpsty

Whittle Laboratory, Department of Engineering, University of Cambridge, Cambridge CB3 0EL, England

J. Eng. Gas Turbines Power 106(3), 532-541 (Jul 01, 1984) (10 pages) doi:10.1115/1.3239604 History: Received July 11, 1983; Online October 15, 2009


An axial skewed slot casing treatment has been tested over the tips of an isolated low-speed rotor with a hub-tip ratio of 0.4. An improvement in stall margin of 22 percent at nominal clearance was obtained. Detailed measurements of the loss pattern downstream of the rotor were made with a hot wire. Measurements were also made in the blade passage with a traversing gear moving with the rotor and in the treatment slots themselves using hot wires. The tentative conclusion is that unsteady effects in the slot are of secondary importance. Of primary importance is the selective removal of high absolute swirl, high loss fluid from the endwall near the trailing edge of the pressure surface of the blade, and reintroduction of this, with absolute swirl direction reversed, near the blade leading edge.

Copyright © 1984 by ASME
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