计入水污染和空穴的船舶艉轴承润滑特性数值分析
Numerical Analysis of Ship Stern Bearing Lubrication Characteristics Considering Water Contamination and Cavitation
朱超 1魏立队 1魏海军 1孔德刚 1张浩 1顾庆宏1
作者信息
- 1. 上海海事大学 商船学院,上海 201306
- 折叠
摘要
为探究少量海水侵入对船舶艉轴承润滑特性的影响,通过实验测量并计算含水率在10%内滑油参数的变化,结合数值分析的方法统筹考虑工质含水率、黏温特性及空穴等因素对液膜润滑特性的影响.结果表明,通过多项式能够较好地拟合流体的黏温特性,且计算过程中液膜的空化和工质的黏温特性不可忽略;在选定工况下,含水率的增加会提高工质的运动黏度,进一步提高液膜压力、承载力、摩擦系数;水的加入明显提高乳液密度和比热容,增强工质携带热量的能力,降低了液膜的总体温度;较高的含水率更易生成空穴,空穴增强了液膜的动压特性,提高了液膜承载力,也降低了液膜的摩擦系数和液膜外侧的最高温度.
Abstract
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.
关键词
船舶艉轴承/水污染/粘温特性/空穴/润滑特性Key words
stern bearing/water pollution/viscosity-temperature characteristics/cavitation/lubrication characteristics引用本文复制引用
基金项目
上海市科技计划项目(20DZ2252300)
出版年
2024
NETL
NSTL
万方数据