一种滑动轴承油膜性能计算的动网格方法

A Dynamic Mesh Method Used to Calculate Oil Film Performance of Journal Bearings

针对应用动网格方法计算油膜轴承性能时出现网格扭曲而导致累计误差过大的现象,提出了一种基于计算流体动力学(CFD)的滑动轴承油膜性能计算的动网格更新方法。该方法保证了网格更新过程中膜厚方向的网格线沿圆周方向上等均分布,且始终垂直于轴颈表面,网格不发生扭曲变形,减小了计算累计误差,提高了轴承性能计算的准确性。通过与典型算例和实验结果对比,验证了所提方法在轴承的油膜力和转子静平衡位置计算中的有效性、可行性和稳定性,并利用该方法分析了进油压力和载荷对油膜轴承所支撑转子静平衡位置的影响。该方法可为准确计算油膜轴承转子系统的性能提供参考。

In order to avoid the phenomenon of mesh distortion and reduce the errors in the applications of dynamic mesh method to calculate oil-film bearing performance,a dynamic mesh updating method was proposed based on CFD.This method ensured that all of the updated radial mesh lines along oil-film clearance were well-distributed along the circumferential direction.During the mesh updating processes,the radial mesh lines in the direction of film thickness were always perpendicular to the journal surfaces,which could ensure oil-film mesh not distortions and improve accuracy of mesh computation.The new dynamic mesh updating method was used to calculate the oil-film forces of the journal bearings and the static balance positions of the rotors.The results were compared with the calculating ones and the experimental ones of typical examples,the effectiveness,feasibility and stability of the dynamic mesh updating method proposed may be verified.By using the method,effects of different inlet oil pressures and loads on static balance positions of the rotors supported by oil-film bearings were analyzed.The proposed method may provide reference for accurately calculating the performance of the oil-film bearing-rotor systems.