A Note on Rotor Instability Caused by Liquid Motions

[+] Author and Article Information
O. Holm-Christensen, K. Träger

Department of Solid Mechanics, The Technical University of Denmark, Lyngby, Denmark

J. Appl. Mech 58(3), 804-811 (Sep 01, 1991) (8 pages) doi:10.1115/1.2897266 History: Received June 01, 1989; Revised May 08, 1990; Online March 31, 2008


The stability conditions of a hollow rotor partially filled with a Newtonian liquid are investigated. The rotor is considered here to be a rigid body, supported by springs and dampers, and exposed to an external dynamic force in the shape of actions of the encountered liquid. The system has two degrees-of-freedom, defined by deflection in two mutually orthogonal fixed directions perpendicular to the rotor axis. The fluid motions are described by Navier-Stokes equations and comparison is made between the inviscid and viscous case in connection with their predictions of the stability conditions. Experiments are performed with two different rigidity ratios and results are found to be in agreement with theoretical data.

Copyright © 1991 by The American Society of Mechanical Engineers
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