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RESEARCH PAPERS

Test Results for Rotordynamic Coefficients of Anti-Swirl Self-Injection Seals

[+] Author and Article Information
C. H. Kim, Y. B. Lee

Tribology Laboratory, Korea Institute of Science and Technology, 130-650 P. O. Box 131, Cheongryang, Seoul, Korea

J. Tribol 116(3), 508-513 (Jul 01, 1994) (6 pages) doi:10.1115/1.2928873 History: Received October 30, 1992; Revised December 10, 1993; Online June 05, 2008

Abstract

Test results are presented for rotordynamic coefficients and leakage for three annular seals which use an anti-swirl self-injection concept to yield significant improvement in whirl frequency ratios as compared to smooth and damper seals. A new anti-swirl self-injection mechanism is achieved by deliberately machining self-injection holes inside the seal stator to partially divert inlet flow into the anti-swirl direction. The anti-swirl self-injection mechanism is used to achieve effective reduction of the tangential flow which is considered as a prime cause of rotor instability in high performance turbomachinery. Test results show that the self-injection mechanism significantly improves whirl frequency ratios; however, the leakage performance degrades due to the introduction of the self-injection mechanism. Through a series of tests, an optimum anti-swirl self-injection seal which uses a labyrinth stator surface with anti-axial flow injections is selected to obtain a significant improvement in the whirl frequency ratio as compared to a damper seal, while showing moderate leakage performance. The best whirl frequency ratio is achieved by an anti-swirl self-injection seal of 12 holes anti-swirl and 6 degree anti-leakage injection with a labyrinth surface configuration. When compared to a damper seal, the optimum configuration outperforms the whirl frequency ratio by a factor of 2.

Copyright © 1994 by The American Society of Mechanical Engineers
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