Abstract
The water film model of the marine water-lubricated stern bearing was established by FLUENT. The influence law of water flow rate on the cooling performance of water-lubricated bearing was studied in consideration of the stern shaft inclination. It will be helpful to improve the performance of marine water-lubricated stern bearing and both security and reliability of propulsion system. The simulation results show that the increase of cooling water flow rate in a certain range can effectively reduce bearing temperature. The bearing temperature rises sharply with thinning of water film thickness which is caused by the increase of inclination angle. Larger inclination angle can deteriorate the operating reliability of bearing.
Highlights
Many factors such as the cantilever action of propeller, shaft misalignment, bearing wear cancause the bending of marine stern shaft.The bending is either to increase the partial contact pressure of stern bearing or to result in the inclination of stern shaft, which will lead tothe boundary friction ofstern bearing, and the lubricating fluid cannot form hydrodynamic lubrication in this situation
The influence of stern shaft inclination on the temperature distribution of water film is analyzed with finite volume method (FVM)
Figure2.CFD model of water film In FLUENT, the boundary conditions of the model are set as follow: (1)Inlet boundary is defined as velocity inlet; (2)Outlet boundary is defined aspressure outlet; (3) Outer wall boundary is defined as fix wall surface; (4) Inner wall boundary is defined as rotating wall surface
Summary
Many factors such as the cantilever action of propeller, shaft misalignment, bearing wear cancause the bending of marine stern shaft.The bending is either to increase the partial contact pressure of stern bearing or to result in the inclination of stern shaft, which will lead tothe boundary friction ofstern bearing, and the lubricating fluid cannot form hydrodynamic lubrication in this situation. What’s more the increased friction factor will worsen the cooling performance of stern bearing. These studies as mentioned above were conducted in ideal state without considering the stern shaftinclination. The main objective of this articleis to conduct a research on the cooling performance of water-lubricated bearingconsidering stern shaft inclination. Bearing, a three-dimensional model of lubricating water film is established in GAMBIT. The influence of stern shaft inclination on the temperature distribution of water film is analyzed with finite volume method (FVM)
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