Water-lubricated bearing is a new type of bearing with water as the lubrication medium, which is widely used. However, because of its work in the waters outside the port, water quality is not easy to ensure, vulnerable to the impact of aquatic organisms and particles in the water and other impurities, resulting in these impurities in the bearing memory, change the lubrication between the shaft and bearing state, thereby increasing wear between the shaft and bearings. Using FLUENT finite element method and Finite difference method in MATLAB, a water lubrication bearing water film model of impurities accumulation is established, the influence of impurity accumulation position, size and quantity on the maximum pressure and carrying capacity of water film is analyzed, and the critical speed of water film formation is studied.
Ship propulsion shafting is the key equipment for ship navigation. The power generated by the main engine of the ship is transmitted to the propeller through the shafting, and the thrust generated by the rotation of the propeller is transmitted to the hull through the shafting, so that the ship can sail normally. Sometimes due to some special circumstances, the ship's propulsion shafting needs to pass through the hull and protrude outboard, and water-lubricated bearings are often used to support the shafts that protrude outboard. However, because the water quality of the outboard is not guaranteed, it is easy to cause impurities such as aquatic organisms or particles to accumulate in the bearing, thus affecting the lubrication of the bearing. At present, the research on water lubricated bearings at home and abroad mainly focuses on the selection of water-lubricated bearing materials, the lubrication characteristics of water-lubricated bearings, the mechanism of friction and wear, and the optimization of bearing structure(Li, Z,2015). At this stage of research on water-lubricated bearing impurity accumulation is less, generally focused on the form of impurities and water mixture.
Most scholars analyze the lubrication characteristics of bearings based on the fact that the bearings are in a normal state. In this paper, for the impurities that have accumulated on the bearing surface, numerical simulation methods are used, and the FLUENT software is used to analyze the water film models of different impurities accumulation, to explore the influence trend and law of the position, size and quantity of impurities on the maximum pressure of the water film and the bearing capacity of the water-lubricated bearing, so as to provide a reference for the structural optimization design of the water-lubricated bearing.
