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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

Rotor/Seal Experimental and Analytical Study on Full Annular Rub

[+] Author and Article Information
J. J. Yu, P. Goldman, D. E. Bently, A. Muzynska

Bently Rotor Dynamics Research Corporation, 1631 Bently Parkway South, Minden, NV 89423

J. Eng. Gas Turbines Power 124(2), 340-350 (Mar 26, 2002) (11 pages) doi:10.1115/1.1416691 History: Received November 01, 1999; Revised February 01, 2000; Online March 26, 2002
Copyright © 2002 by ASME
Topics: Rotors , Stiffness
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References

Figures

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Rotor/seal full annular rub test rig
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Comparison of rotor lateral responses of the two-disk rotor during runup and rundown tests with/without rubbing, respectively. Teflon seal with diametral clearance of 500 μm; two disks with mass unbalance of 1.1 grams at 0 degree. (a) Direct responses, (b) 1× Bode plots near the seal location. An insert in (a) displays the rotor orbit indicating multicontact intermittent rub.
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Synchronous rub showing that amplitude jumps down during runup and jumps up during rundown. Teflon seal with diametral clearance of 1000 μm; one disk with mass unbalance of 1.6 grams.
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Process of generating reverse precessional rub (self-excited vibration, also called “dry whip”) without any outside disturbance. Two-disk rotor/Teflon seal diametral clearance of 500 μm with mass unbalance of 0.5 grams.
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Reverse precesional rub triggered during rundown. One-disk rotor/Teflon seal diametral clearance of 1000 μm with mass unbalance of 1.1 grams.
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Effect of mass unbalance on the starting point where reverse full annular rub occurred without any outside disturbance. One disk rotor, Teflon seal diametral clearance of 250 μm.
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Reverse precessional rub versus time and speed during the whole running process including runup and rundown. One disk rotor, Teflon seal diametral clearance of 750 μm.
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Parameters of slippage of rotor against seal with changes in rotative speed; (a) reverse rub frequency, (b) ratio of reverse frequency to speed, and (c) slip velocity
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Diagram of the rotor/seal system with full annular rub
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Root locus of synchronous response under full annular rub conditions. a=h/Cr=0.2, ς=0.025, Ks/K=0.5. Note that for low value of friction coefficient, f=0.1, the synchronous response is always stable.
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Root locus of synchronous response stability under full annular rub conditions. a=h/Cr=0.2, ς=0.025, Ks/K=0.5,f=0.15. Note that with rotative speed increase the synchronous response experiences transition from being stable to unstable then to stable again.
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Root locus of synchronous response under full annular rub conditions. a=h/Cr=0.2, ς=0.025, Ks/K=0.5. Note that for high value of friction coefficient, f=0.3, the synchronous regime is always unstable.
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Synchronous response for different values of unbalance parameter a with and without rub and its stability
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Synchronous response instability boundaries for different values of f (ς=0.025, p=0.5). Instability leads to self-excited reverse precession. Note destabilizing effect with increase of f.
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Reverse precessional full annular rub frequency

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