【作者】 何春勇；

【导师】 刘正林；

【作者基本信息】 武汉理工大学 ， 载运工具运用工程， 2010， 硕士

【摘要】 推力轴承是潜水泵的重要组成部分。水润滑推力轴承以水为润滑介质,这对于节约油料,节能环保,提高潜水泵的机械效率,减少轴承摩擦、磨损具有重要的理论意义和实际工程应用价值。本论文结合国家自然科学基金资助项目,以潜水泵水润滑推力轴承为研究对象,采用数值计算、有限元仿真和试验相结合的方法,开展推力轴承流体动压润滑和弹流润滑、热—结构耦合特性以及试验验证等方面的研究。论文主要研究工作和结论如下：1)根据雷诺方程及其边界条件,将方程离散化,求得在不考虑弹性变形的条件下的潜水泵水润滑推力轴承润滑性能参数的变化趋势；同时根据J.Boussinesq经典理论,推理了弹性变形方程,将雷诺方程和弹性变形方程耦合求解,得到潜水泵水润滑推力轴承各润滑性能参数的变化趋势,这些趋势为推力轴承的设计提供了理论依据。2)计算潜水泵推力轴承推力瓦与推力环摩擦副端面间的总摩擦热,并给出了推力瓦与推力环摩擦热的分配方法,以及推力瓦对流换热系数,应用有限元软件ANSYS,采用直接耦合法探讨不同运行工况、几何结构参数和材料导热系数对推力瓦温度场的影响规律。研究结果表明,推力瓦出水边靠近外径处摩擦热较大,温度较高；推力瓦四周由于与流体间的对流换热吸收了摩擦产生的部分热量,温度较低。3)为了验证水润滑推力轴承的动压润滑数值分析与温度场有限元求解的正确性,进行了试验研究。试验测试结果表明：摩擦系数变化趋势,水膜厚度、压力分布,以及推力瓦温度分布状况等,与理论计算结果基本一致,较好地验证了理论分析所得到的结论。更多还原

【Abstract】 A thrust bearing is an important component of a submersible pump which is water-lubricated. It will have better theoretic significance and engineering application to save energy, protect environment, improve the mechanical efficiency of marine propulsion system and reduce the friction and abrasion of the bearings.In this article, combined with the project of the National Natural Science Foundation of China, the water-lubricated thrust bearing of the submersible pump is taken as research subject, and its theoretical research is carried out, including the elastohydrodynamic lubrication, characteristic of thermal-structural coupled system, and simulation test of bearings and so on.Main research work and its conclusions are as follows:1) According to Reynolds equation and boundary conditions, the discrete equations are obtained without considering the elastic deformation. The changing trends of the lubrication performance parameters of the water-lubricated thrust bearing can be obtained. And based on classical theory of J.Boussinesq, elastic deformation equation can be deduced. Reynolds equation is solved coupled with elastic deformation equation. And the elastohydrodynamic lubrication characteristics of the water-lubricated thrust bearing can be obtained for the thrust bearing design.2) The total frictional heat, which is from the friction pair of both thrust pad and thrust ring of thrust bearing, is calculated, and the friction heat distribution method and convective heat transfer coefficient are provided. The rule has been studied in use of finite element software ANSYS and direct coupling method, that the thrust pad temperature field is influenced with the different operating conditions, geometry structures and material thermal conductivity coefficients. The results show that the fiction heat is greater and the temperature there is higher near by the water leakage approaches and the outer diameter place of the thrust pad. But the temperature all around the thrust pad is lower, because of the portion friction heat absorbed by convective heat transfer between both thrust pad and fluid.3) In order to verify the correctness of numerical analysis of lubrication performance and finite element solving results in temperature field of the thrust bearing, the tests have been done. The measuring results make clear that the changing trends of friction coefficient of the thrust bearing, water film thickness, pressure distribution, and temperature distribution of the thrust pad are consistent with the theoretical results, which also have better attested the conclusion of the theoretical analysis.更多还原