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Experiments on the dynamic behavior of cavitating pumpsThis paper describes experiments performed to measure the dynamic transfer matrices for cavitating (and noncavitating) pumps. These transfer matrices describe the relationship between small linear oscillatory perturbations in the pressures and mass flow rates at inlet and discharge from the hydraulic machine. The matrices were deduced from direct measurements of these fluctuating quantities for different modes of excitation of the machine. Results for a cavitating inducer are presented as functions of frequency and mean operating state. Though some of the trends in the data are consistent with existing theoretical models of inducer dynamics, others are not, indicating a need for further theoretical investigation of the dynamic characteristics of such flows. The results exhibit increasingly complex dynamics with increasing cavitation; it appears that the hydraulic machine deviates from an essentially passive response without cavitation to an increasingly active response as the cavitation number is reduced.
Document ID
19780057242
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Ng, S. L.
(California Inst. of Tech. Pasadena, CA, United States)
Brennen, C.
(California Institute of Technology Pasadena, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
June 1, 1978
Subject Category
Mechanical Engineering
Accession Number
78A41151
Funding Number(s)
CONTRACT_GRANT: NAS8-28046
CONTRACT_GRANT: NAS8-29313
Distribution Limits
Public
Copyright
Other

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