静压式机械密封流固耦合的理论分析

针对一种收敛间隙静压式机械密封,建立了机械密封流固耦合模型,采用有限元方法求解不可压缩Reynolds方程,得到密封间隙流体压力分布,采用ANSYS有限元软件计算密封组件的弹性变形,利用两者之间自动迭代计算实现流固耦合分析。结果表明,高压工况下,静压式机械密封间隙的压力分布受到密封端面变形的影响,同时又会影响到端面的变形。该流固耦合分析考虑了密封组件之间的接触摩擦和预紧作用,能够准确反映高压流体和密封结构的相互影响。计算得到的泄漏量与实验值吻合,对特殊工况下静压式机械密封的流固耦合研究具有参考意义。

Theoretical analysis on fluid-structure coupling of hydrostatic mechanical seal

Aiming at fluid-structure coupling for a kind of convergent gap hydrostatic mechanical seal,a theoretical analysis model is developed.Based on the FEM method,the pressure distribution in the seal gap is calculated by solving incompressible Reynolds equation,and by using the software ANSYS,the elastic deformation of seal components is got.The fluid-structure coupling is achieved by automatic iterative of the two steps.Results show that,under high pressure condition,the pressure distribution is influenced by the deformation of seal faces,and affects the deformation simultaneously.This model allows for the effect of contact and preload between seal components,and can accurately reflect the interaction between the fluid and seal components.The leakage fits well with the experimental results.The model has clear mechanical meaning and entails straightforward calculations to provide accurate analysis of fluid-structure coupling of hydrostatic seals under special conditions.