圆轴承三维热流体动力润滑的研究

联立求解了广义雷诺方程、三维能量方程、三维固体热传导方程及载荷平衡方程 ,并考虑粘度随温度及压力、密度随粘度及压力的变化 ,在油膜与轴瓦界面使用热流连续性边界条件 ,得到了圆轴承油膜及轴瓦的三维温度场。结果表明最高温度并不出现在油膜与轴瓦交界面 ,不同圆周位置沿膜厚方向的最高温度出现位置不同。证实了考虑三维温度得到的轴承的润滑性能与考虑二维温度得到的轴承润滑性能有很大的差异。采用Newton-Raphson法求解广义雷诺方程和载荷平衡方程 ,采用快速扫描法求解由有限差分离散的能量方程和热传导方程 ,在计算中发现所使用的算法收敛速度快 ,大大节约了计算时间。

Three-Dimensional Thermohydrodynamic Analysis of Circular Journal Bearing

The simultaneous solution of the generalized Reynolds equation,three-dimensional energy equation,three-dimensional heat transfer equation and force equilibrium equation were presented and the changes of the lubricant viscosity and density with the temperature and pressure were taken into account.Consequently,the three-dimensional temperature field was obtained with the heat flux continuity condition imposed at the interface between the oil film and the bush.The result show that the maximum temperature did not appear at the interface between the film and bush and the point of the maximum temperature was different along the film thickness direction at different circumferential locations.The differences of the bearing performances were validated between the three-dimensional temperature model and the two-dimensional temperature model.A Newton-Raphson approach was used in solving the generalized Reynolds equation and the force balance equations,simultaneously.For the energy equation and the heat transfer equation,the finite difference method was carried out with the help of a sweeping scheme.The approaches we used were found to be fast converged and saved computing time greatly.