半解析热流变模型及其在圆锥滚子润滑中的应用

项目名称： 半解析热流变模型及其在圆锥滚子润滑中的应用

项目编号： No.51305220

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 机械、仪表工业

项目作者： 杨萍

作者单位： 青岛理工大学

项目金额： 25万元

中文摘要： 含有高分子材料添加剂的工业润滑油在高温高压大滑滚比条件下会表现出强烈的流变特性，故牛顿流体的假设不能满足生产实践和润滑理论发展的需要。而现有流变模型均只描述了剪应力与剪应变率的关系，粘度与压力和温度的关系还依赖于粘温-粘压经验公式。故现有模型不能准确地揭示流体的流变性能。 本项目拟建立全新的半解析流变模型，它在小滑滚比条件下能解释环境粘度，回归于牛顿流体；在大滑滚比条件下可通过变形恢复时间等参数体现润滑油的剪稀和极限剪应力等流变特性。对选定的润滑油，通过理论和实验确定该模型对应的粘度与压力、温度及剪应变率三者的直接函数关系，从而抛弃等效粘度的概念，完善粘度的计算方法，把牛顿流体和非牛顿流体的润滑理论统一起来。 如此得到完整的流变模型将结合课题组已有的数值计算方法，解决凸度圆锥滚子热流变润滑问题，促进有限长线接触润滑理论的发展，为高温高压大滑滚比条件下齿轮等机械零件的润滑设计提供数据支持。

中文关键词： 流变；弹流润滑；摩擦力；圆锥滚子；滑滚比

英文摘要： On the condition of high temperature and pressure, industrial oil with macromolecule additive would show strong rheological character. So engineering practice and theoretical development of lubrication could not be satisfied by the hypothesis of Newtonian flow. However, the existing rheological models describe only the relationship between shearing strength and strain rate, the viscosity relationship with pressure and temperature depend on empirical formulus. These models, therefore, could not reveal the rheological properties of the fluid accurately. In this project, a new semi-closed rheological model would be established. On the condition of small shear strain rate, the new model could explain environment viscosity, and turn into Newtonian model. With the increase in the shear strain rate, it is able to show the rheological characters of the oil, such as the shear-thinning property and the limiting shear strength. In addition, a direct function of viscosity with pressure, temperature, and shear strain rate would be obtained through both theoretical and experimental studies, which would discard the concept of equivalent viscosity, improve the calculation of viscosity, and unify the lubricating theories of Newtonian and non-Newtonian fluids. The so obtained model would be used for the thermal and rheological lu

英文关键词： Rheology；EHL；Friction；Tapered roller；Slide-roll ratio