摘要
推力轴承是核主泵等大型立式水泵机组的重要部件,推力轴承缺陷轴瓦的润滑特性影响着推力轴承的使用和核主泵的安全。本文针对核主泵推力轴承润滑性能和安全问题,设计并搭建了推力轴承缩比试验台,对缺陷深度0.2 mm、缺陷面积5%的轴瓦进行了多个工作条件下的试验,研究不同工况对推力轴承的润滑性能产生的影响。基于计算流体力学理论对福建福清核电有限公司核主泵推力轴承轴瓦缺陷模型进行了数值建模,建立了缺陷轴瓦的计算模型,获得了不同进油温度下缺陷轴瓦的温度和压力分布。利用温度传感器和压力传感器进行了额定工况和特定工况的性能试验,根据试验数据进行插值分析获得了试验轴瓦性能分布规律。将数值计算结果与试验值进行对比,二者误差在可接受范围内,验证了基于计算流体力学(CFD)动网格方法计算模型的准确性。本文结果可为核主泵推力轴承的安全使用提供参考依据。
Thrust bearings are important components of large vertical water pump units such as nuclear main pumps,which balance the axial force of the rotor shaft system by forming a dynamic oil film on the surface of the bearing pads.During normal operation of the thrust bearing of the nuclear main pump,the thrust disc is separated from the surface of the bearing pad by a lubricating oil film.The defects on the surface of the bearing pad and the friction loss of the bearing are very small,which has a high service life.However,in the actual working process of the thrust bearing of the nuclear main pump,due to various reasons,the alloy layer on the surface of the bearing pad has defects such as material melting,wear,scratches,and cracks,which affect the use of the thrust bearing and the safety of the nuclear main pump.Therefore,it is very important to study the lubrication characteristics of defective thrust bearing shells.This article focuses on the lubrication performance and safety issues of thrust bearings in nuclear main pumps,and designs and builds a thrust bearing scaling test bench.Multiple working conditions were tested on bearing pads with a defect depth of 0.2mm and a defect area of 5%.The temperature and pressure performance tests of the bearing pad defect model were carried out,and the effects of different working conditions on the lubrication performance of thrust bearings were studied.Based on the theory of computational fluid dynamics(CFD),the numerical modeling of the defect model of the thrust bearing pad of Fujian Fuqing Nuclear Power Co.,Ltd.nuclear main pump was carried out.The shape of the defect was simplified to a circular defect area.In order to conform to the actual defect situation and improve the convergence of the calculation,the edges of the defect area adopted a smooth transition.By using the finite volume method to discretize the control equation and solve the calculation,the temperature and pressure distribution cloud maps of the defective bearing pads at different oil inlet temperatures were
作者
蒲可欣
杜鹏程
袁法旭
费冬冬
黄滨
PU Kexin;DU Pengcheng;YUAN Faxu;FEI Dongdong;HUANG Bin(Ocean College,Zhejiang University,Zhoushan 316021,China;Fujian Fuqing Nuclear Power Co.,Ltd.,Fuqing 350318,China)
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2023年第S01期219-227,共9页
Atomic Energy Science and Technology
基金
中核集团“青年英才”项目
国家自然科学基金(51839010)
关键词
推力轴承
润滑性能
计算流体力学
缺陷瓦块
磨损工况
thrust bearing
lubrication property
computational fluid dynamics
defective pad
abrasion condition
