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Aircraft Engine Sump Fire MitigationAn investigation was performed of the conditions in which fires can result and be controlled within the bearing sump simulating that of a gas turbine engine; Esso 4040 Turbo Oil, Mobil Jet 2, and Monsanto MCS-2931 lubricants were used. Control variables include the oil inlet temperature, bearing temperature, oil inlet and scavenge rates, hot air inlet temperature and flow rate, and internal sump baffling. In addition to attempting spontaneous combustion, an electric spark and a rub (friction) mechanism were employed to ignite fires. Spontaneous combustion was not obtained; however, fires were readily ignited with the electric spark while using each of the three test lubricants. Fires were also ignited using the rub mechanism with the only test lubricant evaluated, Esso 4040. Major parameters controlling ignitions were: Sump configuration; Bearing and oil temperatures, hot air temperature and flow and bearing speed. Rubbing between stationary parts and rotating parts (eg. labyrinth seal and mating rub strip) is a very potent fire source suggesting that observed accidental fires in gas turbine sumps may well arise from this cause.
Document ID
19730014164
Document Type
Contractor Report (CR)
Authors
Rosenlieb, J. W. (SKF Industries, Inc. King of Prussia, PA, United States)
Date Acquired
September 2, 2013
Publication Date
January 31, 1973
Subject Category
THERMODYNAMICS AND COMBUSTION
Report/Patent Number
NASA-CR-121158
AL73T007
Funding Number(s)
CONTRACT_GRANT: NAS3-14310
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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