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Dynamic response of film thickness in spiral-groove face sealsTests were performed on an inward- and an outward-pumping spiral-groove face seal to experimentally determine the film thickness response to seal seat motions and to gain insight into the effect of secondary seal friction on film thickness behavior. Film thickness, seal seat axial motion, seal frictional torque, and film axial load were recorded as functions of time. The experiments revealed that for sinusoidal axial oscillations of the seal seat, the primary ring followed the seal seat motion very well. For a skewed seal seat, however, the primary ring did not follow the seal seat motion, and load-carrying capacity was degraded. Secondary seal friction was varied over a wide range to determine its effect on film thickness dynamics. The seals were tested with ambient air at room temperature and atmospheric pressure as the fluid medium. The test speed ranged from 7000 to 20,000 rpm. Seal tangential velocity ranged from 34 to 98 m/sec (113 to 323 ft/sec).
Document ID
19860005843
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Dirusso, E. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 5, 2013
Publication Date
December 1, 1985
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
E-2683
NASA-TP-2544
NAS 1.60:2544
Accession Number
86N15313
Funding Number(s)
PROJECT: RTOP 505-33-78
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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