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Pressure oscillation in the leakage annulus between a shrouded impeller and its housing due to impeller-discharge-pressure disturbancesThe perturbed flow in the leakage path between a shrouded-pump impeller and its housing is analyzed using experiences with the Space Shuttle Main Engine (SSME), high pressure fuel turbopump (HPFTP) wearing-ring seals. Analysis is based on a bulk-flow model which consists of the path-momentum, circumferential momentum, and continuity equations. The pressure oscillations in the leakage annulus are driven by a circumferential variation of the impeller discharge pressure. It is shown that the occurrence and nature of the pressure oscillations depend on the tangential-velocity ratio of the fluid entering the seal, the order of the Fourier coefficient, the closeness of the precessional frequency of the rotating pressure field to the first natural frequency of the fluid annulus, and the clearance of the wearing-ring seal. The results obtained may explain the internal melting observed on SSME HPFTP seal parts.
Document ID
19920050318
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Childs, D. W.
(Texas A & M University College Station, United States)
Date Acquired
August 15, 2013
Publication Date
March 1, 1992
Publication Information
Publication: ASME, Transactions, Journal of Fluids Engineering
Volume: 114
ISSN: 0098-2202
Subject Category
Mechanical Engineering
Accession Number
92A32942
Funding Number(s)
CONTRACT_GRANT: NAS8-37821
Distribution Limits
Public
Copyright
Other

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