张翔,刘晓玲,孙文东,郭峰.计入表面吸附膜的热弹流润滑体系建模及分析[J].表面技术,2022,51(3):57-65.
ZHANG Xiang,LIU Xiao-ling,SUN Wen-dong,GUO Feng.Modeling and Analysis of Thermal EHL System Considering Adsorption Film on Surfaces[J].Surface Technology,2022,51(3):57-65 |
| 计入表面吸附膜的热弹流润滑体系建模及分析 |
| Modeling and Analysis of Thermal EHL System Considering Adsorption Film on Surfaces |
| 投稿时间：2021-04-09 修订日期：2021-08-25 |
| DOI：10.16490/j.cnki.issn.1001-3660.2022.03.005 |
| 中文关键词: 表面吸附膜 弹流润滑 热效应 钢的热传导系数 非牛顿流体 摩擦系数 |
| 英文关键词:surface adsorption film EHL thermal effect thermal conductivity of the steel non-Newtonian fluid friction coefficient |
| 基金项目:国家自然科学基金(51775286，51475250);泰山学者人才工程(TS20190943) |
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| Author | Institution |
| ZHANG Xiang | School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China |
| LIU Xiao-ling | School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China |
| SUN Wen-dong | School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China |
| GUO Feng | School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China |
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| 中文摘要: |
| 目的 研究表面吸附膜在热弹流润滑中的作用机理。方法 构建考虑表面吸附膜的非牛顿流体点接触热弹流润滑模型，分析润滑剂的非牛顿性、吸附膜及钢的热传导系数对热弹流润滑性能的影响。结果 润滑剂的非牛顿性及吸附膜的计入对油膜压力和厚度的影响很小。与牛顿流体相比，非牛顿流体可以得到较低的温升和摩擦系数。同时，随着非牛顿流体特征剪应力的增大，油膜中层温度和吸附膜表面温度有所提高。吸附膜的存在明显提高了润滑油的温升，但降低了摩擦系数。摩擦副表面的摩擦系数随着卷吸速度的增大而逐渐降低。在相同的卷吸速度下，摩擦系数又随着吸附膜厚度的增加而降低。与热弹流润滑中沿用钢的热传导系数不同，合适的热传导系数会引起油膜压力的二次压力峰增大，润滑油的最小膜厚和摩擦系数减小及油膜温度升高。结论 润滑剂的非牛顿性、吸附膜及钢的热传导系数都会影响热弹流润滑性能。因此，在热弹流润滑体系中，考虑表面吸附膜的影响及其作用机理很有必要。 |
| 英文摘要: |
| The purpose of this paper is to investigate the mechanism of surface adsorption film in thermal elastohydrodynamic lubrication (EHL). A non-Newtonian thermal EHL model of point contact with surface adsorption film was built, and effects of the non-Newtonian characteristics of the lubricant, the adsorption film and the thermal conductivity of the steel on thermal EHL performance were analyzed. Results show that, the non-Newtonian characteristics of the lubricant and the adding of adsorption film have almost no effects on the oil film pressure and thickness. Compared with Newtonian fluid, the non-Newtonian fluid can provide lower film temperature rise and friction coefficient. In addition, as the characteristic shear stress of non-Newtonian fluid increases, both the mid-layer film temperature and the surface temperature of the adsorption film increase. Due to the adsorption film, the temperature rise of the oil film increases significantly, but the friction coefficient decreases. The friction coefficient of the friction pair surface decreases gradually with the increase of the entrainment velocity. At the same entrainment velocity, the friction coefficient decreases with the increasing thickness of the adsorption film. Different from thermal conductivity of steel used in traditional thermal EHL, the appropriate thermal conductivity leads to larger secondary pressure peak, less minimum film thickness and friction coefficient, and higher oil film temperature. Thermal EHL performance is influenced by the non- Newtonian characteristics of the lubricant, the adsorption film and the thermal conductivity of the steel. Therefore, it is necessary to consider the effect and mechanism of surface adsorption film in the thermal EHL system. |
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