|
Research on Elastohydrodynamic Lubrication on High-Speed Rolling-Sliding Contacts
Report Number: AFAPL TR 71-54
Author(s): Smith, Richard L.; Walowit, Jed A.; Gupta, Pradeep K.; McGrew, John M.
Corporate Author: Mechanical Technology, Inc. Latham, New York
Laboratory: Air Force Aero Propulsion Laboratory
Publication Date: 12/1/1970
Pages: 176
Features: + Diagram(s) + Drawing(s) + Foldout(s) + Graph(s) + Photo(s)
Contract: F33615-69-C-1305
Project: 3048
Task: 304806
AD Number: AD0737374
Photo Enhancement: Complete
Abstract Text:
A rolling disc apparatus has been designed and built. Tractions between two crown discs lubricated with 5P4E polyphenyl ether have been measured as function of slip rate over a range of Hertz pressure (80,000-140,000 psi), rolling speeds (900-1820 ips), and temperatures (175 F - 215 F). Comparisons are made between measured tractions, Battelle data, and various analytical predictions. The MTI data agree qualitatively with Battelle measurements except that MTI data are found to be relatively insensitive to temperature whereas Battelle reports considerable temperature sensitivity. A semi-empirical mathematical model has been put forth to represent traction measurements.
A computer program for analyzing interactions under partial elastohydrodynamic conditions has been written and a listing is contained in this report.
Options for obtaining report:
Via Contrails:
This report is avalable for download via Contrails:  (176 pages, 4.926 MB)
Via DTIC Online:
This report is not available for download via DTIC Online
Via NASA Technical Report Server:
This report is not available for download via NTRS
Via National Technical Information Service:
The NTIS Order Number for this report is: AD737374
This report should be available for purchase from NTIS at 1-800-553-NTIS
Reference the NTIS Order Number from this record when ordering from NTIS
Be sure to verify bibilographic info when ordering
Indications of Public Availabilty:
No digitial image of an index entry indicating public availability is currently available
There has been no verification of an indication of public availability from an inside cover statement
Solid Lubricated Bearing Technology. Part I. Solid Lubricated High Speed Ball Bearing
Report Number: AFAPL TR 71-69 Part 1
Author(s): Boes, D. J.
Corporate Author: Wetinghouse Research Labs, Pittsburgh, Pennsylvania
Laboratory: Air Force Aero Propulsion Laboratory
Publication Date: 8/1/1971
Pages: 59
Features: + Diagram(s) + Drawing(s) + Graph(s) + Photo(s) + Table(s)
Contract: F33615-70-C-1736
Project: 3048
Task: 304806
AD Number: AD0731163
Photo Enhancement: Complete
Abstract Text:
This report describes the first year's effort of a two year program that has as its objective the development of improved self-contained, solid lubricated ball bearings capable of at least 25 hours operation at speeds approaching 60,000 rpm. The program encompasses a temperature range of -40F to 600F and a maximum load combination of 75 lb thrust/25 lb radial. The work is a follow-on effort to the completed Air Force funded program F33615-68-C-1250. During this reporting period, a high speed test stand was designed and manufactured that is capable of functionally evaluating the performance of solid lubricated, 207 ball bearings over a 30,000 to 60,000 rpm speed range. The device incorporates a 40 H.P., variable speed motor driving a transmission having a 15:1 gear ratio. A test head containing two test bearings is coupled to the output shaft of the transmission. The functional test portion of the program has thus far achieved a maximum life of 15 hours on a solid lubricated ball bearing operating at 30,000 rpm and a temperature of 200F.
Options for obtaining report:
Via Contrails:
This report is avalable for download via Contrails: (59 pages, 2.363 MB)
Via DTIC Online:
This report is not available for download via DTIC Online
Via NASA Technical Report Server:
This report is not available for download via NTRS
Via National Technical Information Service:
The NTIS Order Number for this report is: AD731163
This report should be available for purchase from NTIS at 1-800-553-NTIS
Reference the NTIS Order Number from this record when ordering from NTIS
Be sure to verify bibilographic info when ordering
Indications of Public Availabilty:
No digitial image of an index entry indicating public availability is currently available
There has been no verification of an indication of public availability from an inside cover statement
Liquid Injection into a Supersonic Stream
Report Number: AFAPL TR 71-97 Volume 1
Author(s): Yates, C. L.
Corporate Author: Air Force Aero Propulsion Lab
Laboratory: Air Force Aero Propulsion Laboratory
Publication Date: 3/1/1972
Pages: 116+ Diagram(s) + Graph(s) + Photo(s)
Contract: N00017-72-C-4401
Project: None Given
Task: None Given
AD Number: AD0741887
Photo Enhancement: Complete
Abstract Text:
Photographic data were obtained for the transverse injection of water and isopropyl alcohol from a flat-plate into airstreams having Mach numbers of 1.62 and 2.72. Jet/freestream dynamic pressure ratio, jet Reynolds and Weber numbers, and freestream Reynolds number were varied by factors of 8, 10, 11, and 3, respectively, in the jet penetration tests, and by factors of 23, 4, 9, and 5 in the jet spreading tests. Improved empirical equations for jet penetration and width were developed and were substantiated for two sets of test conditions by detailed flow-field mapping 50 jet diameters downstream using pitot-pressure, cone-static-pressure, and heated sampling probes. Since the injectant spacial distributions from the two tests were nearly similar on a nondimensionalized scale, it may be possible to use these data to predict distributions for other conditions. Finally, an improved theorectical analysis not only predicts jet penetration more accurately than previous ones, but also predicts the transverse distribution of injectant mass.
Options for obtaining report:
Via Contrails:
This report is avalable for download via Contrails: (116 pages, 2.145 MB)
Via DTIC Online:
This report is available for download via DTIC Online: (102 pages, 4 MB)
Via NASA Technical Report Server:
This report is not available for download via NTRS
Via National Technical Information Service:
The NTIS Order Number for this report is: AD741887
This report should be available for purchase from NTIS at 1-800-553-NTIS
Reference the NTIS Order Number from this record when ordering from NTIS
Be sure to verify bibilographic info when ordering
Indications of Public Availabilty:
No digitial image of an index entry indicating public availability is currently available
There has been no verification of an indication of public availability from an inside cover statement
|
|
