| 引用本文: | 刘腾飞,李瑞珍,张绍林,夏勇杰.织构化动压轴承热流体润滑特性理论与试验研究[J].中国表面工程,2023,36(1):156~167 |
| LIU Tengfei,LI Ruizhen,ZHANG Shaolin,XIA Yongjie.Theoretical and Experimental Study on Thermal Fluid Characteristics of Textured Hydrodynamic Bearing[J].China Surface Engineering,2023,36(1):156~167 |
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| 摘要: |
| 为了探究表面织构对动压轴承热流体润滑特性的影响，计入热流体耦合因素更接近轴承的实际工况。以矩形、三角形、 圆形三种表面织构形式动压轴承为研究对象，联立 Reynolds 方程、能量方程、黏温方程和不同形式织构几何特征方程，建立织构化轴承热流体耦合模型。采用有限差分法求解得到油膜压力场分布、温度场分布及轴承特性参数，并分析织构形状、深度、进油温度等因素对织构化轴承特性的影响。结果表明：表面织构能够有效降低油膜温升，改善轴承润滑性能；不同形式织构对于轴承热流体特性影响有所差异，低偏心时矩形织构表现出更好的润滑性能；进油温度对于织构化轴承热流体特性有较大影响，随着进油温度的升高，轴承的特性参数在不断下降，但幅度逐渐减缓。制备了织构化轴承试件并进行工况测试， 试验结果与理论计算对比分析，趋势规律一致，验证了结论的合理性、正确性。 |
| 关键词: 表面织构 动压轴承 热流体 特性参数 试验研究 |
| DOI：10.11933/j.issn.1007?9289.20220410001 |
| 分类号:TG156;TB114 |
| 基金项目:国家自然科学基金(51575498)、河南省自然科学基金面上(222300420547)和河南省高等学校重点科研(20A460004)资助项目 |
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| Theoretical and Experimental Study on Thermal Fluid Characteristics of Textured Hydrodynamic Bearing |
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LIU Tengfei, LI Ruizhen, ZHANG Shaolin, XIA Yongjie
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College of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou 450001 , China
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| Abstract: |
| In recent years, surface texture has attracted the attention of scholars as an effective means to improve the working performance of bearings. Although many studies have been conducted on textured bearings, most are based on isothermal assumptions. To investigate the effects of surface texture on the lubrication characteristics of hydrodynamic bearings, considering the thermal fluid coupling factor provides a more accurate representation of the actual operating conditions of the bearing. Taking a hydrodynamic bearing with three surface textures (rectangle, triangle, and circle) as the research object, a textured bearing thermo-fluid coupling model was established by combining the Reynolds, energy, viscosity-temperature, oil film thickness, geometric characteristics equations of different textures, and the Reynolds pressure boundary condition. The finite difference method was used to discretize the equations, and a program was written to solve the coupling model. When the program calculation result meets certain precision requirements, the oil film pressure field and temperature field distributions and bearing characteristic parameters can be obtained. The bearing and texture parameters from the existing literature were input into the model for calculation, and the calculation results were compared. It was found that the error was within an acceptable range, which verifies the accuracy of the coupling model. On this basis, the effects of the texture shape, depth, oil inlet temperature, and other factors on the thermal fluid lubrication characteristics of textured bearings were analyzed. The results show that surface texture effectively reduces the oil film temperature rise and improves the lubrication performance and load carrying capacity of the bearing. Different textures have different effects on the thermal fluid characteristics of bearings. Among the three different texture forms (rectangle, circle, and triangle), the rectangular texture exhibits the best lubricating performance. When the eccentricity is 0.2, the bearing capacity of the rectangular textured bearing improves by 15% compared with that of the smooth bearing, while the friction factor decreases by 17.6%. When the eccentricity is low, the surface texture can improve the working performance of the bearing and reduce friction; however, it has an adverse effect on the bearing under high eccentricity. The texture depth affects the bearing lubrication characteristics. An optimal texture depth exists that maximizes the bearing capacity of the textured bearing and minimizes the friction factor. The inlet temperature also has a significant influence on the thermal fluid characteristics of the textured bearing. With the increase in the inlet temperature, the characteristic parameters of the bearing continuously decrease, but the rate gradually slows down. In the experimental study, textured bearing specimens were prepared using a laser marking machine, and the texture shape and size were detected using a three-dimensional topography instrument. Then, bearing specimens that met specific requirements were selected, and the working condition test was conducted in the modified friction and wear testing machine. A thermal imager was used to photograph the lubricating oil temperature of the bearing oil inlet at a fixed position. The comparison of experimental and theoretical results showed good agreement, which verifies the rationality and accuracy of the conclusions. |
| Key words: surface texture hydrodynamic bearing thermal fluid characteristic parameter experimental study |
