Numerical Analysis of Ship Stern Bearing Lubrication Characteristics Considering Water Contamination and Cavitation
The impact of minor seawater intrusion on the lubrication properties of stern bearings in marine vessels was stud-ied.Experimental measurements and subsequent calculations were conducted to evaluate the consequences of up to 10%water content on the lubricating oil's parameters.Numerical analysis was utilized to holistically consider the impact of various factors,such as water content,viscosity-temperature characteristics and cavitation on the fluid film's lubrication properties.It was shown that the fluid's viscosity-temperature properties can be accurately represented using a polynomial equation,and in the calculation process,the formation of cavitation and the viscosity-temperature characteristics should not be overlooked.Under the chosen op-erating conditions,an elevation in water content boosts the fluid's dynamic viscosity,thereby enhancing the film pressure,load-bearing capacity,and friction coefficient.The water's addition also significantly increases the emulsion's density and specific heat capacity,thus improving the fluid's heat-carrying capacity and lowering the film's overall temperature.Furthermore,a higher water content fosters cavitation formation,which simultaneously boosts the film's dynamic pressure characteristics and load-bearing capacity,and decreases the friction coefficient and the maximum temperature on the film's external side.
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