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.
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April 1981
This article was originally published in
Journal of Engineering for Power
Research Papers
Rotordynamic Instability in Centrifugal Compressors—Are All the Excitations Understood?
J. M. Vance,
J. M. Vance
Department of Mechanical Engineering, Texas A&M University, College Station, Tex.
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F. J. Laudadio
F. J. Laudadio
Department of Mechanical Engineering, Texas A&M University, College Station, Tex.
Search for other works by this author on:
J. M. Vance
Department of Mechanical Engineering, Texas A&M University, College Station, Tex.
F. J. Laudadio
Department of Mechanical Engineering, Texas A&M University, College Station, Tex.
J. Eng. Power. Apr 1981, 103(2): 288-293 (6 pages)
Published Online: April 1, 1981
Article history
Received:
January 3, 1980
Online:
November 9, 2009
Citation
Vance, J. M., and Laudadio, F. J. (April 1, 1981). "Rotordynamic Instability in Centrifugal Compressors—Are All the Excitations Understood?." ASME. J. Eng. Power. April 1981; 103(2): 288–293. https://doi.org/10.1115/1.3230719
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