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dynamic behavior of spiral-groove and rayleigh-step self-acting face sealsTests were performed to determine the dynamic behavior and establish baseline dynamic data for five self-acting face seals employing Rayleigh-step lift-pads and inward pumping as well as outward-pumping spiral grooves for the lift-generating mechanism. The primary parameters measured in the tests were film thickness, seal seat axial motion, and seal frictional torque. The data show the dynamic response of the film thickness to the motion of the seal seat. The inward-pumping spiral-groove seals exhibited a high-amplitude film thickness vibratory mode with a frequency of four times the shaft speed. This mode was not observed in the other seals tested. The tests also revealed that high film thickness vibration amplitude produces considerably higher average film thickness than do low amplitude film thickness vibrations. The seals were tested at a constant face load of 73 N (16.4 lb) with ambient air at room temperature and atmospheric pressure as the fluid medium. The test speed range was from 7000 to 17000 rpm. Seal tangential speed range was 34.5 to 83.7 m/sec (113 to 274 ft/sec).
Document ID
19840008113
Document Type
Technical Publication (TP)
Authors
Dirusso, Eliseo
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 4, 2013
Publication Date
January 1, 1984
Subject Category
AIRCRAFT PROPULSION AND POWER
Report/Patent Number
NASA-TP-2266
E-1754
NAS 1.60:2266
Funding Number(s)
PROJECT: RTOP 505-33-52
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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