大滑滚比条件下非牛顿流体线接触热弹流润滑分析

Analysis on Thermal EHL for Line Contact of Non-Newtonian Fluid under Large Slide-Roll Ratio

研究在大滑滚比条件下,光滑表面Ree-Eying流体热弹性流体动力润滑接触中油膜的变化。建立大滑滚比下使用Eying流体的时变热弹流数学模型,使用多重网格方法求解雷诺方程、弹性变形方程,使用逐列扫描法求解油膜和固体能量方程,获得大滑滚比情况下非牛顿流体线接触热弹性流体动力润滑数值解。结果表明:随着滑滚比的增大,压力凸起、油膜起始于接触区右侧且不明显,此后随着滑滚比的增加,压力凸起和油膜凹陷逐渐向中心接触区移动,压力峰变大,中心凹陷加深。同时温度曲线也逐渐升高,中高速条件下油膜最大温升曲线的凸起也是起始于接触区右侧最后移动到接触区中心。

The variation of the oil film of thermal elastohydrodynamic lubrication(EHL)in smooth contact with large slide-roll ratio using Eyring fluid flow model was studied.A mathematical model was established to describe the transient thermal EHL with large slide-roll ratio using Eyring rheological model.A multi-grid method was used to solve the Reynolds equation,the elastic deformation was solved by the multi-level multi-integration and the energy equations of oil film and both solids were solved with a line-to-line scanning technique.Thus,numerical solution of thermal EHL problem for line contact with a high slide-roll ratio was obtained.The results show that with the increase of slide-roll ratio,the pressure is increased and oil film dimple emerges at the right side of the contact and moves toward the central contact area,the pressure peak becomes larger,and the dimple becomes deeper.The temperature rise curves are also increased with the increase of the slide-roll ratio.At middle and high surface speeds,the maximum temperature rise curve gains a bump at the right side of the contact and then this bump moves towards the contact center.