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The measurement, modeling, and prediction of traction for rocket propellant 1Traction tests were performed on RP-1, a common kerosene based rocket propellant. Traction data on this fluid are required for purposes of turbopump bearing design, using codes such as SHABERTH. To obtain the traction data, an existing twin disc machine was used, operating under the side slip mode and using elliptical contacts. The range of test variables were: contact peak Hertz stress from 1.0 to 2.0 GPa, disc surface speed from 10 to 50 m/s, fluid inlet temperature from 30 to 70 C, and with a contact aspect ratio of 1.7. The resulting traction curves were reduced to fundamental fluid property parameters using the Johnson and Tevaarwerk traction model. Theoretical traction predictions were performed by back substitution of the fundamental properties into the traction model. Comparison of the predicted with the measured curves gives a high degree of confidence in the correctness of the traction model. For purposes of input to the NASA SHABERTH program, the traction model was next used to predict the expected traction of RP-1 under line contact conditions.
Document ID
19900010070
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Tevaarwerk, J. L. (Battelle Columbus Labs. OH, United States)
Date Acquired
September 6, 2013
Publication Date
October 1, 1989
Subject Category
Propellants And Fuels
Report/Patent Number
NASA-CR-185186
G8558-8701
NAS 1.26:185186
Accession Number
90N19386
Funding Number(s)
PROJECT: RTOP 582-01-11
CONTRACT_GRANT: DLA900-83-C-1744
CONTRACT_GRANT: NASA ORDER C-30012-M
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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