摘要
开展发动机主轴承模型表面形貌及润滑油热效应研究对于减少发动机主轴承摩擦功耗,提高经济性具有重要价值。为减少轴承摩擦功耗,提高发动机输出性能,以发动机主轴承为研究对象,基于轴颈倾斜和热流体雷诺润滑控制方程、能量方程、热传导方程,建立主轴承在轴颈倾斜、轴瓦表面形貌和流体热效应等模型,将轴瓦表面形貌耦合到油膜厚度中,考虑黏度-温度和黏度-温度-压力2种模型下对主轴承润滑油膜压力的影响,结果表明:考虑轴瓦-轴颈表面形貌,轴承油膜厚度表面变得异常粗糙,呈波浪形;随着轴颈偏心率的增加,考虑热流体模型下的油膜压力出现急剧增加,在同一偏心率下是否考虑轴瓦表面形貌在最大油膜压力处有较大差距;轴瓦表面形貌对2种黏度模型下润滑油黏度的影响不明显;随着轴颈偏心率的增加,轴颈-轴瓦处润滑油温度在最大油膜压力处逐渐增大,考虑轴瓦表面形貌分布,在最大油膜压力处润滑油温度分布不均匀。
The study of surface morphology of engine main bearing model and thermal effect of lubricating oil is of significant value for reducing the frictional power loss and improving the economic efficiency.In order to reduce the frictional power loss of the bearings and improve the output performance of the engine,the engine main bearings are taken as research objects.Based on journal misalignment and thermohydrodynamic Reynold lubrication governing equation,energy equation and heat conduction equation,the model of the bearings under conditions of journal misalignment,surface morphology of bearing shell and fluid thermal effect is established,and the surface morphology of bearing shell is coupled into oil film thickness.The influence of viscosity-temperature and viscosity-temperature-pressure models on lubricating oil film pressure of the bearings is considered.The results show that when considering the surface morphology of bearing shell-journal,the surface of bearing oil film thickness becomes unusually rough,exhibiting a wavy pattern;with the increase of journal eccentricity,the oil film pressure under thermohydrodynamic model increases sharply,there is a significant difference in maximum oil film pressure between cases with and without consideration of surface morphology of bearing shell under same eccentricity,the surface morphology of bearing shell has no obvious influence on viscosity of lubricating oil under two viscosity models;with the increase of journal eccentricity,the temperature of lubricating oil at journal-bearing shell gradually increases at maximum oil film pressure,when considering the surface morphology distribution of bearing shell,the temperature distribution of lubricating oil becomes non-uniform at maximum oil film pressure.
作者
谢海超
李娜
王宇博
何振鹏
XIE Haichao;LI Na;WANG Yubo;HE Zhenpeng(State Grid Power Space Technology Co.,Ltd.,Beijing 102200,China;China Salt Products Inspection(Tianjin)Co.,Ltd.,Tianjin 300300 China;Department of Automation,Century College,Beijing University of Posts and Telecommunications,Beijing 102100,China;College of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,China)
出处
《轴承》
北大核心
2025年第9期66-73,共8页
Bearing
关键词
滑动轴承
发动机
表面形貌
轴颈
倾斜
热流体
油膜
plain bearing
engine
surface morphology
journal
misalignment
thermohydrodynamics
oil film
