Sub- and Super-Synchronous Self-Excited Vibrations of a Columnar Rotor Due to Axial Clearance Flow

Sub- and super-synchronous self-excited vibrations due to axial clearance flows were observed in a columnar rotor with an upstream seal in experiments. A smaller clearance on the downstream seal had a larger effect of stabilizing the rotor. In computations, it was found that the rotordynamic fluid f...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2016-11, Vol.49 (7), p.72001
Main Authors: Nishimura, H., Horiguchi, H., Suzuki, T., Sugiyama, K., Tsujimoto, Y.
Format: Article
Language:English
Subjects:
Clearances
Downstream
Downstream effects
Rotor dynamics
Upstream
Vibrations
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Summary:Sub- and super-synchronous self-excited vibrations due to axial clearance flows were observed in a columnar rotor with an upstream seal in experiments. A smaller clearance on the downstream seal had a larger effect of stabilizing the rotor. In computations, it was found that the rotordynamic fluid force tangential to the whirling orbit, which is caused as a response to the vibrations (whirling motions), destabilizes the rotor in the case of the upstream seal and stabilizes the rotor in the case of the downstream seal. It was clarified in the 1-D flow model that the tangential rotordynamic fluid force is mainly caused by an inertia of the clearance flow.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/49/7/072001