| WANG Baomin,WANG Huixin,QIAN Sikai,DU Xuebing,CHEN Xin.Cavitation Effect on Tribological Performance of Journal Bearing with Asymmetric Micro-texture[J],54(1):171-180 |
| Cavitation Effect on Tribological Performance of Journal Bearing with Asymmetric Micro-texture |
| Received:December 29, 2023 Revised:April 08, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2025.01.016 |
| KeyWord:asymmetric micro-texture journal bearing cavitation effect cavitation area rate tribological performance |
| Author | Institution |
| WANG Baomin |
School of Mechanical and Electrical Engineering, Lanzhou University of Technology, Lanzhou , China |
| WANG Huixin |
School of Mechanical and Electrical Engineering, Lanzhou University of Technology, Lanzhou , China |
| QIAN Sikai |
School of Mechanical and Electrical Engineering, Lanzhou University of Technology, Lanzhou , China |
| DU Xuebing |
School of Mechanical and Electrical Engineering, Lanzhou University of Technology, Lanzhou , China |
| CHEN Xin |
School of Mechanical and Electrical Engineering, Lanzhou University of Technology, Lanzhou , China |
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| Abstract: |
| At present, the research on textured surfaces of journal bearings mainly focuses on symmetric textures, and existing studies on asymmetric textured surfaces have shown that reasonable changes for the asymmetry of textured cross section can enhance the cavitation effect of textured surface, which can effectively improve the tribological performance of textured surface. The work aims to investigate the degree of cavitation effect on the tribological performance of asymmetric textured journal bearing when relevant parameters of journal bearing and its surface asymmetric textures have a changement. In this study, based on the N-S fluid calculation equation and the Schnerr-Sauer cavitation model, the numerical calculation model of triangular asymmetric micro-textured journal bearing was established and solved. On account of changement about arrangement positions, asymmetry, aspect ratios of micro-texture and eccentricity of textured bearing, the cavitation effect on tribological performance of journal bearing with asymmetric micro-texture was analyzed. It was found that the tribological performance of triangular asymmetric textured journal bearings was further improved under the condition of accounting for the cavitation effect. The degree to which the cavitation effect improved tribological performance of triangular asymmetric micro-textured journal bearing was related to cavitation area rate, indicating that the larger the cavitation area rate, the more obvious the cavitation phenomenon, and the higher the degree of improvement. When the triangular asymmetric texture was arranged near the maximum pressure of oil film , the journal bearing had the maximum cavitation area rate. The cavitation effect had the greatest effect on bearing capacity and friction coefficient, which increased the bearing carrying capacity by 2.4% and decreased the friction coefficient by 26.1%, respectively. The cavitation area rate of asymmetric textured journal bearings was significantly higher than that of symmetric textured journal bearings, and the cavitation effect had a larger effect on the tribological performance of asymmetric textured journal bearings than that of symmetric textured journal bearings. When the inlet length of asymmetric texture was smaller than the outlet length and the inlet was relatively smooth, the cavitation effect improved the tribological performance of journal bearing better. If the aspect ratio of asymmetric micro-texture is too large or too small, it is not conducive to the formation of cavitation areas and will reduce cavitation area rate of journal bearing. For several sets of aspect ratios designed in this study, there is the maximum cavitation area rate at λ=5, while the maximum bearing capacity and the minimum friction coefficient are obtained. Besides, according to the variation tendency of cavitation area rate with the aspect ratio of triangular asymmetric texture, the maximum cavitation area rate of triangular asymmetric textured journal bearings will appear at λ=5 or other values around λ=5. The cavitation area rate of journal bearing increases with the increase of eccentricity and the degree of the cavitation effect on bearing capacity of journal bearing also increases with the increase of eccentricity. However, excessive eccentricity leads to an increasing cavitation region of the divergent wedge, which is detrimental to the integrity of oil film. Therefore, it is necessary to choose appropriate eccentricity according to the actual situation to achieve the required tribological performance. |
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