| ZHANG Tong-gang,WANG You-qiang,XU Cai-hong,WANG Li-mei.Effects of Ambient Temperature Variation on Thermal Elastohydrody-namic Lubrication of Water-lubricated Hybrid Journal Bearings[J],46(6):69-76 |
| Effects of Ambient Temperature Variation on Thermal Elastohydrody-namic Lubrication of Water-lubricated Hybrid Journal Bearings |
| Received:January 11, 2017 Revised:June 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.06.011 |
| KeyWord:water-lubricated hybrid bearing bush materials ambient temperature external cooling lubricants elastohydrodynamic lubrication |
| Author | Institution |
| ZHANG Tong-gang |
School of Mechanical Engineering, Qingdao University of Technology, Qingdao , China |
| WANG You-qiang |
School of Mechanical Engineering, Qingdao University of Technology, Qingdao , China |
| XU Cai-hong |
School of Mechanical Engineering, Qingdao University of Technology, Qingdao , China |
| WANG Li-mei |
School of Mechanical Engineering, Qingdao University of Technology, Qingdao , China |
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| Abstract: |
| The work aims to study the effects of different seasonal or regional and external cooling on thermal elastohydrodynamic lubrication of water-lubricated hybrid journal bearings. With hole-entry water-lubricated hybrid journal bearing as object of study, the thermal elastohydrodynamic lubrication of water-lubricated hybrid journal bearings was analyzed using the Reynolds equation which has allowed for thermal effect, so as to study changes in film temperature, film pressure and film thickness of water-lubricated hybrid journal bearings with different bearing bush materials under different temperature boundary conditions. When the temperatures of bearing bush and journal were the same but different from initial temperature of lubricant (313 K). The lower the temperatures of bearing bush and journal were, the lower the lubricating film thickness was, and significant temperature change was present in inlet and outlet areas, more obvious the second pressure peak was. As a result of external bearing cooling, the temperature of bearing bush (297.35 K、281.7 K) was kept below initial temperature of the lubricant and journal (313 K). The lower the temperature of the bearing bush was, the lower the temperature of the lubricating film was, the temperature in inlet and outlet areas changed as well, the higher the film thickness of the lubricating film was, and the higher the second pressure peak was. By comparing the two working conditions of the temperature decrease of both journal and bearing bush and single bearing bush, variation trends of lubricant temperature, film thickness and pressure were the same, but amplitudes of variation were different. As the bearings are in different seasons or regions, temperatures of bearing bush and journal differ from the initial temperature of lubricant. The lower the external ambient temperature is, the higher the film thickness is, which is conducive to lubrication. Bearing bush being kept at a low temperature by external cooling can also make the film thickness increases, which is conducive to lubrication. |
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