双向推力轴承支承结构对润滑性能的影响

为分析水泵水轮机双向推力轴承支承结构对润滑性能的影响，建立了推力轴承的三维热弹流动力润滑数学模型，并给出了合理的边界条件. 分别通过有限差分法和大型有限元软件Ansys11.0求解热流体动力润滑模型和瓦块的热弹变形，二者之间的数据传递通过自编接口自动实现. 将文中所建立的计算模型应用于算例分析，得到额定工况下的油膜厚度、油膜压力和瓦块温度分布情况，通过对理论计算结果和试验测量结果对比发现两者吻合较好. 在此基础上分析了3种不同支承结构下的轴承静特性分布和瓦面热弹变形分布趋势.结果表明：选择合理的支承结构将明显提高轴承的润滑性能，条形支承结构和双托盘支承结构的瓦面热弹变形分布比单托盘支承结构更加合理，因此润滑性能要明显优于单托盘支承结构.

Effects of support structure on lubricating properties of bi-directional thrust bearings

A three dimensional thermo elastic hydrodynamic mathematical model of thrust bearing was set up and the boundary conditions was adopted for analysis of the effects of support structure on hydrodynamic lubrication performance of bi directional thrust bearing in pump turbine. The finite difference method was employed to solve the THD model, and the thermal elastic deformations in the pad were obtained by the finite element software ANSYS11.0. The data transfer between the THD model and ANSYS11.0 was carried out automatically by an interface program. The calculation model set up in this paper was then applied to a calculating example. The oil film thickness distribution, oil film pressure distribution and pad temperature distribution were obtained. Good agreement between the theoretical calculating results and experimental test was obtained. On this basis, the static performance distribution and thermo elastic deformation distribution on the pad surface of three different support disks were analyzed. The results show that improving lubricant performance can be obtained if the support structure is chosen correctly, and the thermo elastic deformation distribution on the pad surface of cutting away disk or double disk supported thrust bearing are better than the single disk one, which leads to prior lubricant performance.