| Download | - View final version: A comparative study of the performance of plain journal bearings lubricated with mineral and synthetic based hydroturbine oils (PDF, 9.7 MiB)
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| DOI | Resolve DOI: https://doi.org/10.4224/40003720 |
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| Author | Search for: Dmochowski, W. M.1; Search for: Brockwell, K. R.1; Search for: Breithaupt, T.1; Search for: Liko, B.1ORCID identifier: https://orcid.org/0000-0002-3887-9490 |
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| Affiliation | - National Research Council Canada. NRC Institute for Aerospace Research
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| Format | Text, Technical Report |
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| Physical description | 46 p. |
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| Abstract | A study has been conducted that compares the performance of journal bearings lubricated with mineral and synthetic circulating oils. The synthetic oil was an ISO 46 PAO based circulating oil and the mineral was an ISO 68 grade. The tests were conducted using the NRC instrumented journal bearing test rig and covered bearing characteristics and operating conditions considered to be representative of a wide range of journal bearing applications. The results obtained include bearing losses based on torque readings and bearing surface temperatures obtained from thermocouples arranged circumferentialy and axially in the bearing.
The results confirm that the combination of higher VI and lower ISO viscosity grade yield efficiency benefits for the synthetic lubricant over the entire speed and load range tested. Power loss improvements of up to 20% were obtained under the higher speed conditions. In addition to the power loss results, the maximum bearing surface temperatures were reduced during the synthetic lubricant tests. A maximum temperature reduction of 10 °C was obtained under high-speed conditions. The temperature reduction is most likely attributable to the combined differences in both viscometric and thermal characteristics of the synthetic versus mineral oil. Furthermore, despite some reduction in film thickness, the safe operation of the bearing was not compromised by the use of the lower viscosity grade synthetic lubricant under any of the conditions used.
An extensive theoretical analysis has been completed to complement the analysis of the experimental results. Both theoretical and experimental results have been reduced to the non-dimensional forms often used to characterize journal bearing performance. This information should proof useful in applying the results from this study to bearing applications of different sizes and operating conditions. |
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| Publication date | 2000-12 |
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| Publisher | National Research Council Canada |
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| Series | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 8933595 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 9a063d57-a2eb-4c07-958d-adf41aaab2af |
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| Record created | 2009-04-23 |
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| Record modified | 2025-11-03 |
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