线接触副油—气润滑流动行为分析与润滑特性研究
发布时间：2018-11-28 10:25
【摘要】：油-气润滑中,润滑剂高速空气的作用下沿着管壁向前移动,并以精细油滴的形式喷射到润滑点。现阶段,大多数研究集中在实际应用环节,所得结论仅适用于轴承、高速电主轴等具体零部件。本文以线接触副为研究对象,观测不同润滑参数下,线接触油气润滑流动行为与润滑特性,并探讨两者之间的关系。这既可以为后续开展润滑参数设计提供参考,也可以为生产实践提供指导。主要工作内容与结论如下:1)利用数值模拟观测线接触油-气润滑流场。将线接触油-气润滑系统简化为二维模型,通过CFD软件FLUENT,选择多相流VOF模型与RNG k-?模型,设定适当的物理参数与边界条件,采用非稳态模型,开展数值模拟研究。观测了线接触副油-气润滑空间流场分布与环表面油相体积分布,发现环表面不同位置处油相体积分数平均值在0.1~1之间,该模拟结果与事实相符并且与相应文献所得的结论相符合,验证了数值模拟方法研究的合理性。2)利用上述二维模型,研究了不同影响因素下线接触副油-气润滑流动行为。通过分析不同参数下油-气两相流云图与环表面油相体积分数,得到了不同供油量、供气速度、转速、表面粗糙度、喷射方位等因素下油-气两相流动行为特征。发现供油量q"g0.8ml/min、供气速度v"f5m/s均会引起润滑油在环表面的累积,表面油相体积分数较大;供油量q"f0.2ml/min、供气速度v"g20m/s时入口区润滑油分布少,油相体积分数低。喷射方位会改变入口区压力分布,影响油-气两相流动行为。表面粗糙度的增加、粘度的增加、转速的增大均会提高环表面油相体积分数,其中粘度与转速的影响较小。3)设计线接触油-气润滑系统,开展了不同影响因素下线接触油-气润滑效果的试验研究。采集不同供油量、供气速度、喷射方位、转速、载荷下线接触摩擦系数,联系其流动行为,探讨了油-气润滑特性。发现供气速度v=5m/s时,气流难以带动润滑油流动,环表面油相体积分数大,试验中润滑油无法喷射至环表面,摩擦副干摩擦状态,摩擦系数大;供油量q=2ml/min时,环表面油相体积分数小,呈现乏油状态,摩擦系数较大;增大供油量、供气量,摩擦系数迅速下降;继续增大供应,摩擦系数保持稳定;试验参数范围内,增大转速与载荷会降低摩擦系数,其中转速对摩擦系数影响较大。
[Abstract]:In oil-gas lubrication, the lubricant moves forward along the pipe wall under the action of high speed air and is ejected into the lubrication point in the form of fine oil droplets. At present, most of the research focuses on practical applications, and the conclusions are only applicable to bearings, high-speed motorized spindle and other specific parts. In this paper, the oil / gas lubricating flow behavior and lubrication characteristics of line contact are observed under different lubrication parameters, and the relationship between them is discussed. This can not only provide reference for further development of lubrication parameter design, but also provide guidance for production practice. The main contents and conclusions are as follows: 1) numerical simulation is used to observe the oil-gas lubricated flow field. The linear contact oil-gas lubrication system is simplified into a two-dimensional model. The multiphase flow VOF model and RNG k-model are selected by CFD software FLUENT,. Model, set appropriate physical parameters and boundary conditions, adopt unsteady model, and carry out numerical simulation. The spatial flow field distribution and the oil phase volume distribution on the ring surface are observed. It is found that the average value of the oil phase volume fraction at different positions on the ring surface is between 0.1 and 1. The simulation results are consistent with the facts and the conclusions obtained in the corresponding literatures, which verify the rationality of the numerical simulation method. 2) the oil-gas lubricating flow behavior of the linear contact pairs under different influence factors is studied by using the two-dimensional model mentioned above. By analyzing the oil-gas two-phase flow cloud pattern and the volume fraction of oil phase on the ring surface under different parameters, the characteristics of oil-gas two-phase flow behavior under different oil supply rate, gas supply speed, rotational speed, surface roughness and injection azimuth were obtained. It is found that Q "g0.8ml / min and v" f5m/s can cause the accumulation of lubricating oil on the ring surface, and the volume fraction of the oil phase on the surface is larger. When Q "f 0.2 ml / min and V" g20m/s, the oil distribution in the inlet area is small and the volume fraction of oil phase is low. The injection azimuth will change the pressure distribution in the inlet area and affect the oil-gas two-phase flow behavior. The increase of surface roughness, viscosity and rotational speed will increase the volume fraction of oil phase on the ring surface. An experimental study on the lubricating effect of line contact oil-gas under different influencing factors was carried out. The lubrication characteristics of oil and gas are discussed by collecting the friction coefficient of line contact under different oil supply quantity, gas supply velocity, injection direction, rotation speed and load. It is found that the flow of lubricating oil is difficult to be driven by air flow when the gas supply rate is v=5m/s, the volume fraction of oil phase on the ring surface is large, the lubricating oil can not be injected to the ring surface in the test, the dry friction state of the friction pair and the friction coefficient are large. When the oil supply is q=2ml/min, the volume fraction of the oil phase on the ring surface is small and the friction coefficient is large, the friction coefficient is stable when the oil supply is increased, the gas supply is increased, and the friction coefficient decreases rapidly. In the range of test parameters, the friction coefficient will be reduced by increasing the rotational speed and load, among which the friction coefficient will be greatly affected by the rotational speed.
【学位授予单位】：安徽工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH117.2
本文编号：2362573
[Abstract]:In oil-gas lubrication, the lubricant moves forward along the pipe wall under the action of high speed air and is ejected into the lubrication point in the form of fine oil droplets. At present, most of the research focuses on practical applications, and the conclusions are only applicable to bearings, high-speed motorized spindle and other specific parts. In this paper, the oil / gas lubricating flow behavior and lubrication characteristics of line contact are observed under different lubrication parameters, and the relationship between them is discussed. This can not only provide reference for further development of lubrication parameter design, but also provide guidance for production practice. The main contents and conclusions are as follows: 1) numerical simulation is used to observe the oil-gas lubricated flow field. The linear contact oil-gas lubrication system is simplified into a two-dimensional model. The multiphase flow VOF model and RNG k-model are selected by CFD software FLUENT,. Model, set appropriate physical parameters and boundary conditions, adopt unsteady model, and carry out numerical simulation. The spatial flow field distribution and the oil phase volume distribution on the ring surface are observed. It is found that the average value of the oil phase volume fraction at different positions on the ring surface is between 0.1 and 1. The simulation results are consistent with the facts and the conclusions obtained in the corresponding literatures, which verify the rationality of the numerical simulation method. 2) the oil-gas lubricating flow behavior of the linear contact pairs under different influence factors is studied by using the two-dimensional model mentioned above. By analyzing the oil-gas two-phase flow cloud pattern and the volume fraction of oil phase on the ring surface under different parameters, the characteristics of oil-gas two-phase flow behavior under different oil supply rate, gas supply speed, rotational speed, surface roughness and injection azimuth were obtained. It is found that Q "g0.8ml / min and v" f5m/s can cause the accumulation of lubricating oil on the ring surface, and the volume fraction of the oil phase on the surface is larger. When Q "f 0.2 ml / min and V" g20m/s, the oil distribution in the inlet area is small and the volume fraction of oil phase is low. The injection azimuth will change the pressure distribution in the inlet area and affect the oil-gas two-phase flow behavior. The increase of surface roughness, viscosity and rotational speed will increase the volume fraction of oil phase on the ring surface. An experimental study on the lubricating effect of line contact oil-gas under different influencing factors was carried out. The lubrication characteristics of oil and gas are discussed by collecting the friction coefficient of line contact under different oil supply quantity, gas supply velocity, injection direction, rotation speed and load. It is found that the flow of lubricating oil is difficult to be driven by air flow when the gas supply rate is v=5m/s, the volume fraction of oil phase on the ring surface is large, the lubricating oil can not be injected to the ring surface in the test, the dry friction state of the friction pair and the friction coefficient are large. When the oil supply is q=2ml/min, the volume fraction of the oil phase on the ring surface is small and the friction coefficient is large, the friction coefficient is stable when the oil supply is increased, the gas supply is increased, and the friction coefficient decreases rapidly. In the range of test parameters, the friction coefficient will be reduced by increasing the rotational speed and load, among which the friction coefficient will be greatly affected by the rotational speed.
【学位授予单位】：安徽工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH117.2
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