气穴和热效应影响下高速动压滑动轴承静特性研究

摘要

According to actual operating conditions of high speed hydrodynamic journal bearings,the gas-oil two-phase flow density model and viscosity-temperature relation are introduced.The Reynolds equation,energy equation and corresponding boundary conditions are established under conditions of variable density and variable viscosity.The finite difference method is used to solve simultaneously,the temperature distribution,pressure distribution,density distribution and various static characteristic parameters of oil film are got under different rotational speeds,gas rates and eccentricities.The results show that when cavitations and thermal effect are taken into account,the maximum pressure,load capacity and friction force are decreased,but the lateral flow is increased.With the rotational speed,gas rate and eccentricity ratio higher,the influences are more obvious.%针对高速动压滑动轴承实际工况,引入气油两相流密度模型和黏温关系,建立变密度、变黏度的Reynolds方程和能量方程及相应边界条件.采用有限差分法联立求解,得到不同转速、含气率、偏心率下油膜的温度分布、压力分布、密度分布及各静特性参数.结果表明:计入气穴和热效应影响时,油膜的最大压力、承载力、摩擦力均减小,端泄量增大,且转速越高、含气率和偏心率越大,影响越明显.