摘要
为了探究五叶式箔片轴承楔形空间内的动压效应变化规律及不同偏心率、偏位角及转速等参数对轴承静特性的影响,利用CFD软件FLUENT对轴承的楔形空间流体域进行仿真分析。从N-S方程和连续性方程出发,得到了承载力计算的基本形式。结果表明:在气膜厚度Cr为10、20μm及30μm时,轴承旋转壁面的压力沿中心呈对称式分布,并由最大压力逐渐递减为环境压力。随着转速的提高,最小气膜厚度Cr的压力值不断升高,呈现出正相关特性。在偏位角β=0°时,偏心率ε由0.6增加到0.9时,由动压效应产生的压力增大且沿周向更为集中。但在偏心率ε为0.8时,偏位角β=0°与β=36°的压力分布情况有所不同,并且在此条件下,转速越高,压力沿中心截面的周向分布的波动越剧烈。
In order to explore the variation law of dynamic pressure effect in the wedge space of five-leaf foil bearings,and to study the influence of different eccentricities,deviation angles and rotation speeds on the static characteristics of the bearings,and the fluid domain of the wedge-shaped space of the bearings was simulated and analyzed by using the CFD software FLUENT.Starting from the compressible fluid lubrication equation and the continuity equation,the basic form of bearing capacity calculation is obtained.The results show that when the thickness of the air film Cr is 10,20 and 30μm,the pressure of the rotating wall of the bearing is symmetrically distributed along the center,and gradually decreases from the maximum pressure to the ambient pressure.With the increase of rotational speed,the pressure value of the minimum film thickness Cr increases,showing a positive correlation.At the eccentricity ofβ=0°,the pressure distribution area in the wedge space is larger when the eccentricity isε=0.6,and the pressure distribution area in the wedge space is smaller when the eccentricity isε=0.9.When the eccentricity isε=0.8,the dynamic pressure effect area of the eccentricity angleβ=0°is less than that ofβ=36°.Meanwhile,under this condition,the higher the rotational speed,the smaller the peak value of the circumferential distribution limit wave of pressure along the central section is.
作者
张志莲
孔祥雨
孟波
邓瑞洋
张樱瀚
孙鑫悦
ZHANG Zhilian;KONG Xiangyu;MENG Bo;DENG Ruiyang;ZHANG Yinghan;SUN Xinyue(Beijing Institute of Petrochemical Technology,SCHOOLOF MECHANICAL ENGINEERING,Beijing,102627)
出处
《北京石油化工学院学报》
2024年第4期12-19,37,共9页
Journal of Beijing Institute of Petrochemical Technology
基金
中国电力建设股份有限公司科技项目(2022-05-03)。
关键词
多叶式箔片轴承
气膜厚度
动压效应
楔形空间
multi-lobe foil bearings
film thickness
dynamic pressure effect
wedge space
