液膜参数对核主泵水导轴承动静态特性的影响

Effect of Liquid Film Parameters on Dynamic and Static Performance of a Water-lubricated Guide Bearing for Reactor Coolant Pump

为了对水导轴承的液膜几何参数进行优化设计,掌握不同工况下液膜几何参数对核主泵水导轴承动静态特性的影响,基于有限差分法分析了偏心率、半径间隙和长径比等参数对水导轴承动静态特性的影响规律。结果表明:轴承承载力和功率损耗随偏心率和长径比的增大而增大,随半径间隙的增大而减小;轴承阻尼系数随偏心率和长径比的增大而增大,随半径间隙的增大而减小;在保证轴承承载力和液膜稳定性要求并尽量降低功耗的条件下,对主泵水导轴承进行设计时,取偏心率为0.5~0.7,半径间隙为0.2~0.3 mm,长径比为0.8~1.0较为合适。

To optimize the geometric parameters of the liquid film over a water-lubricated guide bearing and analyze the influence of the following liquid film geometric parameters on the dynamic and static performance of the water-lubricated guide bearing in reactor coolant pump under different working conditions using finite difference method,such as the eccentricity,radius gap and aspect ratio,etc.Results show that the bearing capacity and power loss increase with the rise of eccentricity and aspect ratio,and decrease with the rise of radius gap;the damping coefficient of the bearing increases with rising eccentricity and aspect ratio,and decreases with rising radius gap.To ensure the bearing capacity and liquid film stability and to minimize the power loss,the optimal geometric parameters are recommended as the eccentricity ranging from 0.5 to 0.7,the radius gap ranging from 0.2 mm to 0.3 mm,and the aspect ratio ranging from 0.8 to 1.0 for the water-lubricated guide bearing of a reactor coolant pump.