(1.Institute of Chemical Machinery Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China; 2.Department of Electrical Machinery, Harbin Institute of Large Electrical Machinery, Harbin, Heilongjiang 150040, China)
A threedimensional thermoelastichydrodynamic 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 bidirectional thrust bearing in pumpturbine. The finite difference method was employed to solve the THD model, and the thermalelastic 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 thermoelastic 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 thermoelastic deformation distribution on the pad surface of cutting away disk or doubledisk supported thrust bearing are better than the singledisk one, which leads to prior lubricant performance.
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