浮环密封端面分形磨损有限元模拟及试验验证

Finite element analysis and experimental verification of fractal wear on floating ring seal end faces

针对浮环密封运行过程中高频浮动导致的密封端面磨损进而造成密封泄漏量增大的问题,建立基于分形理论的浮环密封端面分形磨损预估模型,采用ABAQUS中的UMESHMOTION子程序和ALE自适应网格技术对浮环密封端面磨损过程进行仿真模拟,通过修正的Archard磨损理论计算接触区域的磨损深度,开展浮环端面磨损的内在规律研究,并通过试验验证了有限元模型的准确性。进一步分析了浮环端面表面形貌及工况参数对磨损深度的影响,以期为浮环端面密封的设计及磨损防护提供指导。研究结果表明:浮环端面磨损深度随着分形维数D的增加而减小,但随着特征尺度G的增加而增大,当D≤1.65时,G的变化对磨损深度影响尤为显著;随着浮环端面载荷增加,其磨损深度呈现与分形维数D和特征尺度G增加有关的近似线性上升趋势;磨损循环次数的不同将形成各异的磨损深度分布,而随着循环次数的增加,石墨浮环的磨损深度逐渐上升,尤其在接触区边缘达到峰值,并在磨损区域两端出现明显的凹陷。

To address the increased seal leakage caused by wear on the sealing end face due to the high-frequency fluctuations during the operation of floating ring seals,a fractal wear prediction model for the end face of the floating ring seal based on fractal theory was established.ABAQUS's UMESHMOTION subroutine and ALE adaptive grid technology were employed to simulate the wear process of the sealing end face.The wear depth in the contact area was calculated by using the modified Archard wear theory,and the intrinsic laws of wear on the floating ring end face were studied.The accuracy of the finite element model was validated experimentally.The research further analyzed the impact of surface morphology and operating conditions on wear depth,in order to guidance for the design and wear protection of the floating ring end face seals.The results show that the wear depth of the floating ring end face decreases with the increase of fractal dimension D but increases with the increase of characteristic scale G.When D≤1.65,the change of G has a particularly significant impact on wear depth.As the load on the floating ring end face increases,its wear depth shows an approximately linear upward trend related to the increase in fractal dimension D and characteristic scale G,especially when G value is larger.Different wear cycle times will result in different wear depth distributions,and as the cycle times increase,the wear depth of graphite floating rings gradually rises,especially reaching a peak at the edge of the contact area,and obvious dents appear at both ends of the wear area.