高压大流量乳化液泵滑动轴承热流体动力润滑仿真分析

建立了滑动轴承热流体动力润滑模型,并针对乳化液泵曲轴滑动轴承在工作状态下的热流体动力润滑性能进行了仿真研究,主要分析讨论了偏心率、润滑油黏度和曲轴转速对滑动轴承润滑性能的影响。计算中采用了二维Reynolds方程计算滑动轴承的油膜的压力分布及厚度分布,采用能量方程和黏温方程耦合计算求解滑动轴承油膜的温升分布,并应用有限差分法通过Fortran程序对模型中的各方程进行了迭代求解。通过理论与试验方法验证了热流体动力润滑模型的正确性:滑动轴承的最小油膜厚度仿真计算结果与理论值相吻合,且为偏心率的单调递减的线性函数;润滑油黏度对滑动轴承内压力影响系数的仿真值与试验值吻合较好。仿真结果表明:滑动轴承油膜的承载能力,随着偏心率、润滑油黏度、曲轴转速的增加而增大;滑动轴承油膜的换热能力,随偏心率、润滑油黏度以及曲轴转速的降低而增加。

Numerical study on thermohydrodynamic performance of journal bearing in high-pressure and large-flow-rate emulsion pump

The study investigated the lubricant performance of journal bearing in an emulsion pump.A thermohydrodynamic model written in Fortran program was developed in this study based on finite difference method.The effects of the eccentricity of journal bearing，the viscosity of lubrication oil as well as the rational speed of crankshaft on the lubricant performance of journal bearing were taken into account.The result reveals that the carrying capacity of oil film in journal bearing increases with the increase of eccentricity，viscosity and the rational speed of crankshaft;the heat-exchange capacity of oil film in journal bearing increases with the decrease of eccentricity，viscosity and the rational speed of crankshaft;the calculated minimum thickness of oil film agrees very well with the theoretical result and it is a monotone decreasing linear function of eccentricity.