Rotordynamic Instability in Centrifugal Compressors—Are All the Excitations Understood?

[+] Author and Article Information
J. M. Vance, F. J. Laudadio

Department of Mechanical Engineering, Texas A&M University, College Station, Tex.

J. Eng. Power 103(2), 288-293 (Apr 01, 1981) (6 pages) doi:10.1115/1.3230719 History: Received January 03, 1980; Online November 09, 2009


A published history of rotordynamic instability problems with centrifugal compressors is documented from the literature. Established theory for computerized stability analysis is reviewed, and the use of cross-coupled stiffness and damping coefficients to represent destabilizing forces is explained. A derivation of cross-coupled stiffness coefficients for torquewhirl is presented. Experimental measurements made on a simple test rig with a radial-vaned impeller are described, which show that a working fluid can exert destabilizing forces on such an impeller. These forces must be considered, in addition to journal bearing and internal hysteresis excitations, if accurate predictions of rotordynamic instability thresholds are to be made. Several classifications of these forces are hypothesized.

Copyright © 1981 by ASME
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