等温条件下非牛顿流体的弹流特性分析

发布时间：2018-12-14 22:31

【摘要】：为研究弹流润滑的非牛顿效应,对稳态和时变条件下等温点接触牛顿流体与非牛顿流体的弹流特性差异进行分析。假设润滑剂为Ree-Eyring非牛顿流体,研究卷吸速度、滑滚比、最大赫兹接触压力以及特征剪应力对弹流润滑性能的影响,分析时变条件下非牛顿流体的弹流特性,并与牛顿流体进行比较。结果表明,等温、轻载工况下,速度的增加导致牛顿流体产生较为尖锐的第二压力峰,导致非牛顿流体的接触区入口膜厚增加,且滑滚比越大增加越明显;高速、大滑滚比条件下,载荷越轻非牛顿效应越明显;时变条件下,速度波动对牛顿流体和非牛顿流体都产生较大影响,非牛顿流体的第二压力峰在各个瞬时始终小于牛顿流体。因此,等温点接触弹流润滑条件下,动态效应和非牛顿效应不应忽视。
[Abstract]:In order to study the non-Newtonian effect of elastohydrodynamic lubrication, the difference of elastohydrodynamic characteristics between isothermal point contact Newtonian fluid and non-Newtonian fluid under steady and time-varying conditions was analyzed. Under the assumption that the lubricant is a Ree-Eyring non-Newtonian fluid, the effects of entrainment velocity, slip ratio, maximum Hertz contact pressure and characteristic shear stress on EHL performance are studied. The elastohydrodynamic characteristics of non-Newtonian fluids under time-varying conditions are analyzed. And compared with Newtonian fluid. The results show that under isothermal and light load conditions, the increase of velocity leads to a sharp second pressure peak of Newtonian fluid, which leads to the increase of inlet film thickness of non-Newtonian fluid, and the more the sliding ratio increases, the more obvious it is. Under the condition of high speed and large slip ratio, the lighter the load is, the more obvious the non-Newtonian effect is. Under the time-varying condition, the velocity fluctuation has great influence on both Newtonian fluid and non-Newtonian fluid. The second pressure peak of non-Newtonian fluid is always smaller than Newtonian fluid in every instantaneous. Therefore, the dynamic effect and non-Newtonian effect should not be ignored under the condition of isothermal point contact elastohydrodynamic lubrication.
【作者单位】：青岛理工大学机械工程学院;
【基金】：国家自然科学基金项目(51475250;51075221) 山东省自然科学基金项目(ZR2014JL037)
【分类号】：TH117.2

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