滚动轴承油气两相流润滑特性研究

发布时间：2018-01-01 06:39

本文关键词：滚动轴承油气两相流润滑特性研究　出处：《北方工业大学》2012年硕士论文　论文类型：学位论文

【摘要】：滚动轴承在机械设备中的应用非常广泛,它的润滑状态决定着整个系统的工作情况。近年来,随着油气润滑技术的快速发展,这种新型的气液两相冷却润滑技术越来越多的被运用于滚动轴承中。随着计算流体力学CFD的高速发展,各种计算流体力学软件逐渐成熟起来,为多物理场耦合分析提供了可能,滚动轴承热机耦合、热流耦合分析也逐渐成为人们研究的热点问题。本文基于油气润滑在滚动轴承中的应用,以圆柱形润滑喷嘴内外流场和滚动轴承温度场为研究对象,运用计算流体力学CFD分析软件Fluent进行模拟仿真分析,探讨环状流在流经喷嘴时的流动状态和滚动轴承在油气润滑工况下的温度场随流场的变化规律,对油气润滑技术的发展和应用具有一定的指导意义。研究结果表明： (1)环状流在喷嘴内外流场的流动状态与喷嘴的结构参数有关,喷嘴的收缩角和出口直径对环状流的液膜流动较大的影响。 (2)滚动轴承的转速和润滑油粘度对轴承的发热量有较大的影响。轴承腔内部与空气的对流换热系数与轴承转速和压缩空气的流量有关,在喷嘴出口直径很小的情况下,空气入口速度对对流换热系数的影响较小。 (3)对油气润滑条件下的深沟球轴承进行热源分析和生热计算,得出了深沟球轴承在不同转速下的发热量和对流换热系数,并运用Fluent软件对轴承的三维模型进行热流耦合计算,得到了不同工况下的轴承工作温度。通过与传统油润滑状态下的轴承温度场仿真计算结果对比分析,得出油气润滑下的轴承温度远低于油润滑状态下的轴承工作温度。
[Abstract]:Rolling bearing is widely used in mechanical equipment, its lubrication state determines the working situation of the whole system. In recent years, with the rapid development of oil and gas lubrication technology. This new gas-liquid two-phase cooling lubrication technology is more and more used in rolling bearings. With the rapid development of computational fluid dynamics (CFD), a variety of computational fluid dynamics software has matured gradually, which provides the possibility for multi-physical field coupling analysis, rolling bearing thermo-mechanical coupling. Heat flux coupling analysis has gradually become a hot issue. Based on the application of oil and gas lubrication in rolling bearing, this paper takes the inner and outer flow field of cylindrical lubricating nozzle and the temperature field of rolling bearing as the research object. The computational fluid dynamics CFD analysis software Fluent is used to simulate and analyze. The study of the flow state of annular flow through the nozzle and the variation of temperature field of rolling bearing with the flow field under the condition of oil and gas lubrication have certain guiding significance for the development and application of oil and gas lubrication technology. The results show that: 1) the flow state of the annular flow inside and outside the nozzle is related to the structure parameters of the nozzle, and the shrinkage angle and the outlet diameter of the nozzle have great influence on the liquid film flow of the annular flow. The speed of rolling bearing and the viscosity of lubricating oil have great influence on the heat of bearing. The convection heat transfer coefficient between bearing chamber and air is related to the speed of bearing and the flow rate of compressed air. When the nozzle outlet diameter is very small, the influence of air inlet velocity on convection heat transfer coefficient is small. 3) the heat source analysis and heat generation calculation of deep groove ball bearing under the condition of oil and gas lubrication are carried out, and the heat and convection heat transfer coefficient of deep groove ball bearing at different rotational speeds are obtained. The Fluent software is used to calculate the heat flux coupling of the three dimensional model of the bearing. The operating temperature of bearing under different working conditions is obtained and compared with the simulation results of bearing temperature field under the condition of traditional oil lubrication. The bearing temperature under oil-gas lubrication is much lower than that under oil-lubricated condition.
【学位授予单位】：北方工业大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH133.33

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