基于流固耦合的抽水蓄能机组推力瓦变形以及安全性能分析

Analysis of Thrust Pad Deformation and Safety Performance of Pumped Storage Unit based on Fluid-Structure Coupling

抽水蓄能机组的推力轴承在运行时常承受较大荷载,因而在不同工况下会产生不同程度的形变,对机组的运行产生不同程度的影响。本文以江西洪屏抽水蓄能电站为分析对象,基于流固耦合理论,采用数值仿真技术对该电站的推力瓦进行分析,研究了不同工况下推力瓦的应变和安全系数。结果表明,随着机组转速升高,推力瓦瓦面的形变增大并且安全系数降低;随着油膜厚度增大,瓦面的形变先增加后减少,安全系数先减小后增加。基于以上分析,在机组运行过程中保持稳定的转速以及维持稳定的油膜厚度,都将有利于提高推力瓦安全系数。

Pumped-storage thrust bearings often bear relatively large loads during operation,and therefore will produce varying degrees of deformation under different working conditions,which will affect the operation of the unit to varying degrees.This paper takes Jiangxi Hongping Pumped-storage Power Station as the analysis object,and uses CFD technology to numerically simulate the thrust pad of the power station based on the theory of fluid-structure interaction.The strain and safety factor of the thrust tile under different working conditions are analyzed and studied.The results show that as the unit speed increases,the deformation of the thrust tile surface increases and the safety factor decreases;as the oil film thickness increases,the deformation of the tile surface first increases and then decreases,and the safety factor first decreases and then increases.Based on the above analysis,maintaining a stable speed and maintaining a stable oil film thickness during the operation of the unit will help to improve the safety factor of the thrust tile.