Three-dimensional thermo-hydrodynamic simulation of industrial lubricants effect on hydrodynamic characteristics of finite tilting-pad journal bearings

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Abstract

Numerical analysis and simulation of industrial lubricants in journal bearings are very important because of their numerous applications in various industries such as power plants, turbomachinery, electrical machinery, shipbuilding, and etc. In these investigations, valuable information such as temperature distribution of pads and oil, heat and friction losses, load capacity, and etc. are extracted which are used by the designers and constructors to improve the performance of bearings. In this paper, a numerical three-dimensional thermo-hydrodynamic code has been developed to simulate the steady condition of tilting-pad journal bearings without restrictions on their size, especially length of bearings. In this program, Reynolds equations for oil flow in the gap between the shaft and the bearing pads are solved by using a numerical finite difference method with a successive over-relaxation scheme. In this simulation, for closing the solution to the real conditions, oil viscosity changes with temperature and the deformation of the pads is also taken into account. To assess the effect of the physical properties of oil-bearing on hydrodynamic behavior of bearings, several important and widely used industrial bearing oils have been selected and the results are presented in this paper. Friction loss, the maximum temperature of the pads, oil flow rate, the minimum thickness of the oil Film and the pads tilting angle are the main presented results.

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Journal of Solid and Fluid Mechanics
Volume 5, Issue 4 - Serial Number 4
January and February 2016
Pages 257-269

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