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Hydrodynamic impeller stiffness, damping, and inertia in the rotordynamics of centrifugal flow pumpsThe lateral hydrodynamic forces experienced by a centrifugal pump impeller performing circular whirl motions within several volute geometries were measured. The lateral forces were decomposed into: (1) time averaged lateral forces and (2) hydrodynamic force matrices representing the variation of the lateral forces with position of the impeller center. It is found that these force matrices essentially consist of equal diagonal terms and skew symmetric off diagonal terms. One consequence of this is that during its whirl motion the impeller experiences forces acting normal and tangential to the locus of whirl. Data on these normal and tangential forces are presented; it is shown that there exists a region of positive reduced whirl frequencies, within which the hydrodynamic forces can be destablizing with respect to whirl.
Document ID
19850005816
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Jery, S. (California Inst. of Tech. Pasadena, CA, United States)
Acosta, A. J. (California Inst. of Tech. Pasadena, CA, United States)
Brennen, C. E. (California Inst. of Tech. Pasadena, CA, United States)
Caughey, T. K. (California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 12, 2013
Publication Date
December 1, 1984
Publication Information
Publication: NASA. Lewis Research Center Rotordynamic Instability Problems in High-Performance Turbomachinery
Subject Category
Mechanical Engineering
Accession Number
85N14125
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19850005807Collected WorksRotordynamic Instability Problems in High-Performance Turbomachinery
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