多唇往复滑环式组合密封数值模拟与分析

构建一种适用于多唇往复滑环式组合密封的数值模型，数值模型中包含固体力学分析、流体力学分析、接触力学分析、流固耦合分析。以含有3段密封唇的PS封为例，基于数值模型求解得到密封面油膜厚度分布、油膜压力分布、粗糙峰接触压力分布，以及内外行程的流量和密封界面的摩擦力。该数值计算方法解决了多唇密封中边界条件难确定的问题，通过迭代计算可得到稳态运行时各密封唇的边界条件。明确多唇PS封的密封机制，分析不同往复速度对密封性能的影响。结果表明：多唇PS封内外行程中各唇边界条件差异较大，外行程中，两唇之间的空隙处存在一定压力，内行程中空隙压力为0；外行程的密封面接触压力要小于内行程；增大往复速度会使多唇PS封净泄漏增加，摩擦力减小。

Numerical Simulation and Analysis of Multi-lip Reciprocating Slip Ring Combined Seal

A numerical model for multi-lip reciprocating slip ring combined seal was established,which includes solid mechanics analysis,fluid mechanics analysis,contact mechanics analysis and fluid-structure coupling analysis.Taking PS seal with three sealing lips as an example,the oil film thickness distribution,oil film pressure distribution,rough peak contact pressure distribution,internal and external stroke flow rate and friction force of sealing interface were obtained based on numerical model.This numerical calculation method solves the problem that boundary conditions are difficult to determine in multi-lip seal,and the boundary conditions of each sealing lip in steady state can be obtained through iterative calculation.The sealing mechanism of multi-lip PS seal was clarified,and the influence of different reciprocating speed on sealing performance was analyzed.The results show that the boundary conditions of each lip vary greatly in the internal and external stroke of multi-lip PS seal.In the external stroke,there is a certain pressure at the gap between the two lips,while in the internal stroke,the gap pressure is 0.The contact pressure of the sealing surface of the outer stroke is less than that of the inner stroke.The increase of reciprocating speed will increase the net leakage of multi-lip PS seal and decrease the friction force.