NDLI: Ssme seal test program: test results for smooth, hole-pattern and helically-grooved stators

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Ssme seal test program: test results for smooth, hole-pattern and helically-grooved stators

Content Provider	NASA Technical Reports Server (NTRS)
Author	Childs, Dara W.
Copyright Year	1987
Description	All of the listed seals were tested in a liquid Halon test facility at high Reynolds numbers. In addition, a helically-grooved-stator seal was tested in an air seal facility. An analysis of the test results with comparisons to theoretical predictions supports the following conclusions: (1) For small seals, the Hirs' friction-factor model is more restricted than had been thought; (2) For smooth seals, predictions of stiffness and damping improve markedly as the radical clearance is reduced; (3) Friction-factor data for hole-pattern-seal stators frequently deviates from the Hirs model; (4) Predictions of stiffness and damping coefficients for hole-pattern-stator seals is generally reasonable; (5) Tests for the hole-pattern stators at reduced clearances show no clear optimum for hole-pattern seals with respect to either hole-area ratio or hole depth to minimum clearance ratios; (6) Tests of these hole-pattern stators show no significant advantage in net damping over smooth seals; (7) Tests of helically-grooved seal stators in Halon show reasonable agreement between theory and prediction for leakage and direct stiffness but poor agreement for the net damping coefficient.
File Size	4863857
Page Count	123
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19870016920
Archival Resource Key	ark:/13960/t5t77979w
Language	English
Publisher Date	1987-04-01
Access Restriction	Open
Subject Keyword	Mechanical Engineering Damping Seals Stoppers Friction Hole Distribution Mechanics Rotors Space Shuttle Main Engine Stators Stiffness Grooves Engine Parts Holes Mechanics 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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