基于正交试验的核主泵水导轴承润滑特性分析

Lubrication Characteristic Analysis of Water-lubricated Guide Bearing of Reactor Coolant Pump Based on Orthogonal Test

为了更加准确地分析核主泵水导轴承性能,提高轴系设计的可靠性及其泵机组的安全稳定性,基于有限差分方法求解Reynolds方程,建立水导轴承的流体动力润滑仿真模型。采用正交试验方法完成以偏心率、半径间隙、长径比和转速为优化参数,以轴承承载力、功率损耗、最大液膜压力和最小液膜厚度为轴承性能指标的试验设计。通过极差分析得到各参数对水导轴承各性能影响的主次顺序和一组最优参数组合。结果表明:影响轴承承载力和功率损耗最显著的因素是转速,影响最小液膜厚度和最大液膜压力最显著的因素是偏心率。在满足多目标性能最优的条件下,综合分析该核主泵水导轴承最优设计参数组合为偏心率取0.6、半径间隙取0.3 mm、长径比取1和转速取1500 r/min。

In order to accurately analyze the performance of the water-lubricated guide bearing of the reactor coolant pump,improve the reliability of the shafting design and the safety and stability of the unit,the lubrication simulation model of the water-lubricated guide bearing is established by solving the Reynolds equation based on the finite difference method.The orthogonal test method is used to complete the test design with eccentricity,radius clearance,length diameter ratio and rotation speed as optimization parameters,bearing capacity,power loss,maximum liquid film pressure and minimum liquid film thickness as performance indicators.Through the range analysis,the primary and secondary order and a group of optimal parameter combinations of the influence of each parameter on the performance of the water-lubricated guide bearing are obtained.The results show that the most significant factor of bearing capacity and power loss is rotation speed,and the most significant factor of minimum film thickness and maximum film pressure is eccentricity.Under the condition of multiobjective performance optimization,the optimal parameter combination of the water-lubricated guide bearing of the reactor coolant pump is comprehensively analyzed,which is 0.6 for eccentricity,0.3 mm for radius clearance,1 for length diameter ratio and 1500 r/min for rotation speed.