Numerical simulations for the fluid-thermal-structural interaction lubrication in a tilting pad thrust bearing

Engineering Computations - Tập 34 Số 4 - Trang 1149-1165 - 2017
Liming Zhai1, Yongyao Luo1, Xin Liu1, Funan Chen2, Yexiang Xiao3, Zhengwei Wang1
1Department of Thermal Engineering, Tsinghua University, Beijing, China
2State Key Laboratory of Hydroscience and Engineering & Department of Thermal Engineering, Tsinghua University, Beijing, China
3Tsinghua University, Beijing, China

Tóm tắt

Purpose The purpose of this paper is to analyze lubrication characteristics of a tilting pad thrust bearing considering the effect of the thermal elastic deformation of the pad and collar. Design/methodology/approach This study used the fluid–solid interaction (FSI) technique to investigate the lubrication characteristics of a tilting pad thrust bearing for several typical operating conditions. The influences of the rotational speed, the thrust load and the oil supply temperature on the lubrication characteristics were analyzed. Findings The three-dimensional (3D) film model clearly shows that there is no pressure gradient but large temperature gradients across the film thickness. The wall heat transfer coefficients on the pad surfaces distribute in a very complex way and change within a large range. The rotational speed, the thrust load and the oil supply temperature have great but different influences on the lubrication characteristics. Originality/value This paper has preliminarily revealed the lubrication mechanism of the tilting-pad thrust bearings. The 3D FSI method is suggested to evaluate the thermal-elastic-hydrodynamic deformations of thrust bearings instead of the conventional method which iteratively solves the Reynolds equation, the energy equation, the heat conduction equation and the elastic equilibrium equation. Using FSI method, the heat transfer coefficients on the pad surfaces can be evaluated better.

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Engineering Computations

Tập 34 Số 4

1149-1165

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