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seal-rotordynamic-coefficient test results for a model ssme atd-hpftp turbine interstate seal with and without a swirl brakeThe predictions of Scharrer's (1988) theory for rotordynamic coefficients of labyrinth gas seals were compared with measurements for a model SSME Alternate Turbopump Development High-Pressure Fuel Turbopump with and without swirl brakes. Using the test apparatus described by Childs et al. (1986, 1990), tests were conducted with supply pressures up to 18.3 bars and speeds up to 16,000 rpm. Seal back pressure was controlled to provide four pressure ratios at all supply pressures. No measurable difference in leakage was detected for the seal with and without the swirl brakes. Comparisons of the measurement results for the seal without a swirl brake with the Scharrer theory showed that the theory can be used only to provide design guidelines; systematic differences were observed between theory and experiment due to changes in running speed, supply pressure, and pressure ratio.
Document ID
19910039031
Document Type
Reprint (Version printed in journal)
Authors
Childs, D. W.
(Texas A&M Univ. College Station, TX, United States)
Ramsey, C.
(Texas A & M University College Station, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Publication Information
Publication: ASME, Transactions, Journal of Tribology
Volume: 113
ISSN: 0742-4787
Subject Category
MECHANICAL ENGINEERING
Funding Number(s)
CONTRACT_GRANT: NAG3-181
Distribution Limits
Public
Copyright
Other