Influence Of Water-lubricated Rubber Stern Tube Bearings Cooling Lubrication Performance On FLUENT

Rubber is a kind of high elastic material, its vibration absorbing property and processing performance is good, it has many advantages on wear particle wear, friction and wear and fatigue wear performance and so on. It is widely used in water lubrication stern bearing in the lining. But, because of the water is low viscosity, low boiling point, and when the ship in the low speed and heavy loading or rev. stop instantly, the bearing operation condition is very bad, bearing cooling effect is poor, there is no relevant research can solve the problems well.To improve the water lubrication stern bearing cooling performance, optimization of the bearing structure, improve the service life of the bearings, this paper mainly through the stern bearing tribology performance test, carries on the bearing speed characteristic and temperature characteristic research, and use Gambit former processor software to establish water lubrication rubber stern bearing CFD model, introduction to the FLUENT software calculation, without considering bearing material by temperature change, analyzes the bearing structure parameters (bearing slot form, cistern width, cistern number, slot form, water tank depth), tail shaft tilt and bearing operation condition (axial speed, bearing axial velocity) on the bearing water film pressure and bearing the influence law of temperature, and get a conclusion that:(1) The tribological performance test results. For concave stern bearing the speed-friction factor and temperature characteristic test. Speed-friction factor curve shape and experience Stribeck theoretical curve similar to verify the water lubricated bearing test data is reliable for the subsequent chapters provide relevant data, the calculation of Temperature characteristic test shows that the greater pressure than friction factor is smaller, within the scope of certain and spindle speed is larger, the smaller the friction factor.(2) Stern bearing structure parameters on the cooling effect. Through a series of different flow velocities of bearing temperature contrast found that open slot bearing cooling effect is superior to that in the vicinity of groove bearing. In the vicinity of groove bearing high temperature area is larger, but the water membrane support significantly greater than open groove bearings, therefore, in meet the cooling effect of the premise, try to reduce the number of water bearing lower half. Tank width within the scope of certain influence on bearing cooling effect, water tank is wider, bearing temperature is lower, but the effect is not obvious. Usually, the more the number of water bearing temperature is lower. Tank form of bearing the impact is not big, Roman tank slightly better than U tank. Tank depth of the bearing has significant effect on the cooling effect.(3) Shaft by propeller cantilever action, produce tilt, lead to bearing friction intensifies, water film formation difficult, bearing temperature also increase. Different waters and season will lead to stern bearing cooling water temperature is very different. When the cooling water initial temperature is higher, the bearing temperature will rise accordingly. Bearing in different speed different cooling water flow rate, bearing a great difference of temperature between the. Low speed low inlet velocity, the bearing temperature is relatively high, the relatively high speed high inlet velocity, the bearing temperature is relatively low.