微量供油条件下润滑油膜特性实验研究

发布时间：2018-02-14 21:25

本文关键词： 弹性流体动压润滑微液滴毛细力铺展乏油　出处：《青岛理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：油气润滑技术是一种先进的润滑技术。实际上，油气润滑供油时进入摩擦副形成润滑油膜的是一些离散的微小润滑油液滴。本文实验研究了单个微小润滑油液滴在进入球-盘接触区前后的静态铺展现象以及纯滚动下润滑油膜的动态生成特性。主要研究内容包括：（1）实验观察了微液滴在球盘静态接触间隙中的铺展行为。微液滴在进入球盘接触区之前由于毛细力作用发生铺展变形，直接影响润滑油膜的生成。研究了不同种类的润滑油形成的微液滴在不同体积、不同界面、不同载荷下的铺展时间，铺展距离，以及铺展速度的变化规律。研究表明，随着微液滴的尺寸的增加，微液滴的铺展速度增加；随着润滑油粘度的增加，液滴铺展速度减小。微液滴在高表面能界面上具有较大的铺展速度。当表面张力较小时，液滴的初始铺展半径变大，铺展距离明显减小，且产生二次铺展现象。（2）研究了微液滴供油条件下的弹流油膜动态形成过程。油气润滑的供油由微小的润滑油液滴完成。首先针对单一液滴（0.1μl）供油下的润滑过程进行试验观察，研究了润滑时间同卷吸速度的关系。其次研究了纯滚动条件下当润滑油粘度和卷吸速度变化时微液滴尺寸对油膜形状的影响。结果表明：润滑时间随速度的增加而减少。卷吸速度、液滴尺寸对润滑油膜的形成具有决定性影响。（3）测量了微量润滑条件下的乏油润滑行为。微液滴供油下的润滑，，本质上可认为是一种乏油条件润滑，因此对少量润滑油供油时的润滑特性的研究具有重要意义。设计相关实验对微量润滑条件下的乏油润滑进行了试验观察。研究结果表明：卷吸速度越大，出口区乏油情况越严重。通过数值模拟得到的结果与试验现象基本吻合。
[Abstract]:Oil and gas lubrication is an advanced lubrication technology. In fact, In this paper, the static spreading phenomenon of a single tiny lubricating oil droplet before and after entering the ball disk contact area and its purity were studied. The dynamic forming characteristics of lubricating oil film under rolling. The main research contents are as follows:. The spreading behavior of microdroplets in the static contact gap of the ball disk was observed experimentally. Before entering the contact area of the ball disk, the microdroplets were spread and deformed by capillary force, which directly affected the formation of lubricating oil film. The effects of different kinds of lubricating oil on the formation of microdroplets in different volume and interface were studied. The variation of spreading time, spreading distance and spreading speed under different loads. The results show that with the increase of the size of microdroplets, the spreading speed of microdroplets increases, and the viscosity of lubricating oil increases. When the surface tension is small, the initial spreading radius of the droplet becomes larger, the spreading distance decreases obviously, and the secondary spreading phenomenon occurs. The dynamic formation process of elastohydrodynamic oil film under the condition of microdroplet oil supply was studied. The oil supply of oil and gas lubrication is accomplished by small droplets of lubricating oil. First, the lubrication process under the single drop of 0.1 渭 l is observed experimentally. The relationship between lubricating time and entrainment speed is studied. Secondly, the influence of the size of microdroplet on the film shape when the viscosity and entrainment velocity of lubricating oil changes under pure rolling condition is studied. The results show that the lubrication time increases with the increase of speed. And reduce the speed of entrapment, Droplet size has a decisive effect on the formation of lubricating oil film. The lubricating behavior of spent oil under trace lubrication was measured. The lubrication under the microdroplet oil supply can be regarded as a kind of lubrication under the condition of lack of oil in essence. Therefore, it is of great significance to study the lubrication characteristics of a small amount of lubricating oil when it is supplied. The experimental observation on the lubrication of the spent oil under the condition of micro lubrication is carried out. The results show that the higher the entrainment speed is, The results obtained by numerical simulation are in good agreement with the experimental phenomena.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TH117.2

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