Predicting Oscillatory Fluid-Elastic Instability of a Tongue-in-Groove Leakage Joint

[+] Author and Article Information
David J. Manko, Myron M. Sussman

Bechtel Bettis Corporation, Bettis Atomic Power Laboratory, P.O. Box 79, West Mifflin, PA 15122-0079

J. Appl. Mech 71(1), 41-48 (Mar 17, 2004) (8 pages) doi:10.1115/1.1640368 History: Received September 18, 2002; Revised June 10, 2003; Online March 17, 2004
Copyright © 2004 by ASME
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Tongue-in-groove leakage joint bench test section
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Plate geometry (schematic)
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Curtiss-Wright tongue-in-groove joint geometry. This joint can be regarded as five channels in sequence: (1) vertical channel indicated by l12; (2) horizontal channel indicated by lue; (3) vertical channel indicated by l34; (4) horizontal channel indicated by lle; and (5) vertical channel indicated by l56.
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Stability map showing the structural eigenvalue’s real component as a function of flow rate and upper gap spacing. Negative and positive components indicate stable and unstable conditions, respectively, while the neutral stability point is identified by a zero value. (Joint flow is given in m3 /sec and plate position in m.)
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Channel model mesh. Half the mesh lines in each direction have been omitted for clarity.
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Mesh closeup of first inlet bend
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Velocity profile for the fluid-only solution
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Centerline pressure profile for the fluid-only solution. Pressure is plotted versus vertical length, with channel geometry overlaid for clarity.
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Results of SBDM coupled simulation with loop conditions modeled, Qjoint=0.317 l/sec




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