摘要
建立了核主泵可倾瓦主推力轴承的准三维热弹性流体动力润滑模型,提出一种将雷诺方程、承载力平衡方程和力矩平衡方程转化为等式约束方程的牛顿迭代算法,以解决压力、膜厚及偏心率间的强耦合计算问题。采用有限单元法统一求解由油膜准三维能量方程、镜板和轴瓦的热传导方程构成的离散方程组,避免了传统迭代计算中的多重嵌套循环带来的计算效率低下的问题。通过数值仿真计算,研究了轴承几何参数对轴承润滑性能的影响规律。研究结果表明,合理的支点周向和径向位置可以提升油膜动压效应,改善轴承润滑性能;在研究范围内,以最小油膜厚度、最大油膜压力和最高油膜温度作为轴承性能评价指标,推荐轴承结构几何参数范围为:径向偏心率范围O_(θ)=0.58~0.60、周向偏心率范围O_(r)=0.58~0.60。
A quasi-3D thermal elastohydrodynamic lubrication model is developed to analyze the performance of tilting pad thrust bearing for nuclear main pump.Aiming at the resolving the coupling between oil film pressure,film thickness and eccentricity ratios,a Newton iterative algorithm is proposed to transform the Reynolds equation,bearing capacity equation and moment balance equation into an equality constraint equation.The finite element method is used to simultaneously solve the quasi-3D energy equation of oil film and the heat conduction equations of the bearing pad and runner plate,which avoids the low computation efficiency due to the traditional multi-iteration schemes.By the numerical simulation,the influence of various geometric parameters of the bearing on the lubrication performance is investigated.The results show that the reasonable position of the pivot can significantly improve the hydrodynamic effect of the oil film and enhance the lubrication performance of the bearing.Within the study scope,taking the minimum oil film thickness,the maximum oil film pressure and the maximum oil film temperature as the bearing performance evaluation criteria,the recommended range of geometric parameters of the bearing structure is as follows:the radial eccentricity range is O_(θ)=0.58-0.60 and the circumferential eccentricity range is O_(r)=0.58-0.60.
作者
宋轩敏
孟祥铠
江锦波
马艺
彭旭东
SONG Xuanmin;MENG Xiangkai;JIANG Jinbo;MA Yi;PENG Xudong(Institute of Chemical Process Machinery,Zhejiang University of Technology,Hangzhou 310032)
出处
《高技术通讯》
北大核心
2025年第8期911-922,共12页
Chinese High Technology Letters
基金
宁波市科技创新2025重大专项(2022Z050)资助项目。
关键词
可倾瓦推力轴承
牛顿迭代法
准三维能量方程
热弹性流体动力润滑
有限单元法
tilting-pad thrust bearing
Newton method
quasi-3D energy equation
thermal elastohydrodynamic lubrication
the finite element method
