NDLI: Dynamic behavior of spiral-groove and rayleigh-step self-acting face seals

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Dynamic behavior of spiral-groove and rayleigh-step self-acting face seals

Content Provider	NASA Technical Reports Server (NTRS)
Author	Dirusso, Eliseo
Copyright Year	1984
Description	Tests 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).
File Size	1198812
Page Count	26
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19840008113
Archival Resource Key	ark:/13960/t7zm05z64
Language	English
Publisher Date	1984-01-01
Access Restriction	Open
Subject Keyword	Aircraft Propulsion And Power Dynamic Response Vibration Amplitudes Atmospheric Pressure Hydrodynamics Film Thickness Shafts Machine Elements Seals Stoppers Gas Bearings Dynamic Tests Friction Spectrum Analysis Predictions Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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