基于CFD的水润滑斜-平面瓦推力轴承承载能力分析  

Load Carrying Capacity Analysis of Water Lubricated Slope-platform Thrust Bearing Using CFD Method

作　　者：李正[1] 蒋丹[1] 尹忠慰[1] 高庚员[1] 张秀丽[1] 

机构地区：[1]上海交通大学机械工程与动力学院,上海200240

出　　处：《润滑与密封》2015年第2期40-45,共6页Lubrication Engineering

基　　金：国家自然科学基金项目(50875169)

摘　　要：水润滑斜-平面推力轴承用水作为润滑介质,传统油润滑斜-平面推力轴承的计算公式及图表不再适用。基于计算流体动力学(CFD)理论,建立不同的水膜润滑模型并进行仿真计算,在水槽尺寸一定时,分析最小水膜厚度、瓦块中径上瓦斜面升高比、瓦块中径上斜面和平面之比以及转速对某斜-平面瓦推力轴承承载力的影响。结果表明:水膜的厚度是影响水膜承载力的主要因素,水润滑斜-平面瓦轴承轴向承载力随着水膜厚度的减小而增加;当水槽尺寸、最小水膜厚度以及转速一定,瓦斜面占长比为0.7、瓦斜面升高比为2时,轴承承载能力最大;在靠近水槽的轴承壁面上产生了空化现象;对于某个特定结构的轴瓦,推力环转速的变化不影响水膜压强中心的位置。Water lubrication slope-platform thrust bearing uses water as its lubricant medium, so the traditional calcula- tion formula and charts of slope-platform thrust with oil lubrication are no longer applicable. Based on the theory of compu- tational fluid dynamics（CFD） ,water film lubrication models were built, and the simulation calculation was performed to analyze the effects on load capacity of one slope-platform thrust bearing by the minimum thickness of water film, ratio of pad height to the minimum film thickness, ratio of length of the inclined surface to the total length and angular speed. Re- sults show that water film thickness is the main factor affecting the loading capacity, and loading capacity is increased with the decrease of the water film thickness. There is an optimum ratio of length of the inclined surface to the total length and ratio of pad height to the minimum film thickness, which maximizes the load capacity when groove size, the minimum film thickness of water film and angular speed are constant. The best ratios are approximately O. 7 and 2 respectively. In addi- tion, the cavitation occurs on the bearing wall near the sink, and the speed of the thrust ring will not affect the center loca- tion of water film pressure.

关 键 词：水润滑 斜-平面推力瓦轴承 承载能力 空化 

分 类 号：TH133.37[机械工程—机械制造及自动化]