滚动条件下弹流接触区中心封油排出过程的数值模拟

Numerical Simulation of the Entrapped Lubricant Drainage in an Elastohydrodynamic Contact under Rolling Conditions

建立弹流接触区冲击封油的形成和排出过程的数学模型,并对该过程进行数值模拟。结果表明:在纯滚动条件下,存在一临界位移,当封闭润滑油核心位移小于该临界位移时,封油核心运动速度等于卷吸速度;当封闭润滑油核心位移大于该临界位移,其移动速度小于卷吸速度,核心处油膜厚度下降;卷吸速度增大以及初始间隙减少都会导致临界位移增大。通过实验验证数值计算的正确性。

A mathematical model was established about the impact entrapment and drainage of lubricants in an elastohydrodynamic contact,and numerical simulations were carried out to study the lubrication behaviour. The results show that there exists a critical value for the displacement of the entrapped lubricant core. When the core displacement is less than the critical value, it moves at the entrainment speed. When the core moves beyond the critical position, its speed becomes lower than the entrainment speed, and the core film thickness decreases. Increasing the entrainment speed and reducing the initial gap lead to the increase of the critical displacement. Experiments were carried out to verify the numerical calculations.