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Experimental measurements of hydrodynamic radial forces and stiffness matrices for a centrifugal pump-impellerMeasurements of the steady-state hydrodynamic forces on a centrifugal pump impeller are presented as a function of position within two geometrically different volutes. These correspond to the forces experienced by the impeller at zero whirl frequency. The hydrodynamic force matrices derived from these measurements exhibit both diagonal and off-diagonal terms of substantial magnitude. These terms are of the form which would tend to excite a whirl motion in a rotordynamic analysis of the pump; this may be the cause of 'rough running' reported in many pumps. Static pressure measurements in the impeller discharge flow show that the hydrodynamic force on the impeller contains a substantial component due to the nonisotropy of the net momentum flux leaving the impeller. A similar breakdown of the contributions to the stiffness matrices reveals that the major component of these matrices results from the nonisotropy of the momentum flux.
Document ID
19860027232
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Chamieh, D. 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 Institute of Technology Pasadena, United States)
Date Acquired
August 12, 2013
Publication Date
September 1, 1985
Publication Information
Publication: ASME, Transactions, Journal of Fluids Engineering
Volume: 107
ISSN: 0098-2202
Subject Category
Mechanical Engineering
Accession Number
86A11970
Funding Number(s)
CONTRACT_GRANT: NAS8-33108
Distribution Limits
Public
Copyright
Other

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