基于不同流变模型的等温线接触弹流润滑分析

摘要

In order to discuss the effects of different rheological models on the minimum film thickness and central film thickness,Ree-Eyring fluid,Bair-Winer fluid and Carreau fluid were selected and non Newtonian fluid elastohydrodynamic lubrication model was established.The influence of environmental viscosity on oil film pressure and film thickness was explored.The results demonstrate that the minimum film thickness calculated by the Carreau rheological model is most consistent with the measured result.Compared with Newton fluid model,the higher center oil film thickness is obtained based on Carreau and Ree-Eyring rheological models,and the highest center oil film thickness is obtained based on Carreau model,the minimum film thickness is obtained based on Bair-Winer rheological model.Compared with the Roelands model,a lower viscosity in the central region produced by the Doolittle free volume viscosity model.The oil film thickness is increased with high ambient viscosity,and the peak value of the second pressure is also increased.%选取Ree-Eyring流体、Bair-Winer流体和Carreau流体建立非牛顿流体等温弹流润滑模型,研究不同流变模型对最小膜厚和中心膜厚影响,并与Newton流体进行比较,同时讨论环境黏度对油膜压力和膜厚的影响.结果表明:基于Carreau流变模型得到的最小膜厚与实测结果最吻合;与Newton流体模型相比,Carreau流变模型和Ree-Eyring流变模型得到的油膜中心厚度较高,其中Carreau流变模型的油膜中心厚度最高,Bair-Winer流变模型得到的中心膜厚最小;与Roelands黏压模型相比,采用Doolittle自由体积黏压模型在中心区域产生较低的黏度;环境黏度高的润滑油油膜厚度增加,第二压力峰值也增大.