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Application of signal analysis to cavitationThe diagnostic facilities of the cross power spectrum and the coherence function have been employed to enhance the identification of not only the inception of cavitation, but also its level. Two piezoelectric pressure transducers placed in the downstream chamber of a model spool valve undergoing various levels of cavitation allowed for the use of both functions - the phase angle of the complex cross spectrum and the dimensionless coherence function - to sense clearly the difference between noise levels associated with a noncavitating jet from those once cavitation inception is attained. The cavitation noise within the chamber exhibited quite a regular character in terms of the phase difference between instruments for limited cavitation. Varying cavitation levels clearly illustrated the effect of bubble size on the attendant frequency range for which there was an extremely high coherence or nearly perfect causality.
Document ID
19840066405
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Martin, C. S.
(Georgia Institute of Technology Atlanta, GA, United States)
Veerabhadra Rao, P.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 12, 2013
Publication Date
September 1, 1984
Publication Information
Publication: ASME, Transactions, Journal of Fluids Engineering
Volume: 106
ISSN: 0098-2202
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
84A49192
Funding Number(s)
CONTRACT_GRANT: F33615-77-C-2036
Distribution Limits
Public
Copyright
Other

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