中文摘要：

应用分子动力学方法研究楔形纳米流道内壁面运行速度及固液间的相互作用势对液体润滑膜压力的影响。研究表明：轴承系统分离之前,液体薄膜的压力分布曲线偏离轴承系统正常运转状态下液体润滑油膜的压力分布曲线;壁面运动速度的增加对模拟区域内最大压力的影响是有一定的局限性,当运行速度较低时,随壁面速度的增加润滑薄膜的压力不断增加,当压力达到最大值后,不再随着速度的增加而改变;轴承系统分离之前,对模拟系统内压力起主导作用的是分子间相互作用势能;固液间的相互作用势能的强弱,对模拟区域内压力变化有着重要的影响,当固液间的作用势相对较弱时,随着固液间势能作用指数的增强,模拟区域中最大压力值小范围内下降;当固液间的作用势相对较强时,随着固液间势能作用指数的增加,模拟区域内的压力不断增加。

英文摘要：

Molecular dynamics method is applied to studying the influence of velocity and solid-liquid potential on the pressure of fluid film in wedge nanochannels. The results indicate that the pressure profiles show strong deviations from one of classical fluid film before the separation of bearing from bearing pedestal. The impact of velocity of solid wall on the maximum pressure in the simulation region is limited. For slow velocity, the pressure increases with the increase of velocity. After the pressure in the simulation region reaches the maximum, it will no longer increase with the increase of velocity. Before the separation of bearing from bearing pedestal, the pressure of simulation box is determined by the potential energy contribution. The strength of interaction potential between the liquid and the solid has important influence on the pressure variation in the simulation area. For relatively weak interaction potential, with the enhancement of potential interaction index, the maximum pressure value in the simulation area decreases in a small range. For relatively strong interaction potential, with the increase of potential interaction index, the pressure in the simulation area keeps increasing.