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An experimental and theoretical comparison of rotordynamic coefficients for sawtooth-pattern damper sealsA brief review of the annular seal theory as related to rotordynamics for liquid seals is presented. Also included is an overview of Childs and Kim's current theory for calculating empirical turbulence coefficients and predicting stiffness and damping coefficients for surface roughened damper seals. The designation sawtooth-pattern refers to a seal stator with a roughness pattern whose cross section normal to the seal axis resembles a sawtooth with the teeth directed against the flow. The net stiffness and damping coefficients for the eleven seals are compared to each other, a smooth seal, and the optimum-configuration damper seal previously tested. The experimental force coefficients, the net damping, and the net stiffness coefficients for four of the sawtooth seals are compared to the predictions of Childs and Kim's analysis. The sawtooth-pattern seal had less net damping than the hole-pattern seal but more than the smooth seal. The stiffness was comparable to the hole-pattern. Both the sawtooth and hole-pattern seals leaked less than the smooth seal, while the sawtooth-pattern seal with maximum damping leaked more than the hole-pattern seal. The theoretical predictions compared relatively poorly to the experimental results obtained for the rotordynamic coefficients of the seals investigation.
Document ID
19870009386
Acquisition Source
Legacy CDMS
Document Type
Thesis/Dissertation
Authors
Nolan, Steven Anthony
(Texas A&M Univ. College Station, TX, United States)
Date Acquired
September 5, 2013
Publication Date
January 1, 1987
Subject Category
Mechanical Engineering
Report/Patent Number
NASA-CR-179026
SEAL-1-87
NAS 1.26:179026
Accession Number
87N18819
Funding Number(s)
CONTRACT_GRANT: NAS8-35824
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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