基于双向流固耦合的高压供油泵主轴润滑分析

Analysis of the main shaft lubrication effect of high pressure oil supply pump based on fluid structure coupling

为了改善转子式高压供油泵的润滑问题,建立主轴关键润滑部位的仿真模型。基于弹流润滑和计算流体力学理论,通过Fluent与MATLAB两种仿真软件分别计算流体压力,并对比两种仿真软件计算出的油膜压力值。通过Workbench平台搭建双向流固耦合计算模型,计算不同表面粗糙度、工作转速、润滑油黏度对弹流润滑的影响。结果表明:主轴转速和润滑油黏度增加都会使油膜压力和主轴的形变量显著增加,使润滑环境更恶劣;在不考虑多相流的情况下,表面粗糙度对润滑的影响较小。主轴的表面粗糙度增大对润滑油的流动具有阻滞作用,可以降低油膜压力,缓解主轴产生的形变,但效果不明显。

In order to improve the lubrication problem of the rotor type high pressure oil supply pump,the simulation model of the key lubrication parts of the main shaft is established.Based on the theory of EHL and CFD,the fluid pressure is calculated by fluent and MATLAB,the maximum oil film pressure is compared.A two-way fluid structure coupling model is built on the Workbench platform to calculate the influence of different surface roughness,working speed and lubricant viscosity on elastohydrodynamic lubrication.After comparing the results,the two-way fluid structure coupling is realized by workbench,and the effects of different roughness,rotation speed and lubricant viscosity on EHL are calculated.The results show that the increase of spindle speed and lubricant viscosity will significantly increase the oil film pressure and spindle type variables,making the lubrication environment worse.In the case of not considering multiphase flow,the effect of roughness on lubrication is less.The larger the roughness of the main shaft,the more it blocks the flow of lubricating oil and reduces the oil film pressure,which can relieve the deformation of the main shaft,but the effect is not obvious.