表面粗糙度对矩形动密封特性的影响

基于耦合了密封圈的弹性变形、流体动力分析和过盈接触的密封性能数值计算流程，利用Matlab 软件编程实现矩形动密封特性的数值计算，得到矩形密封圈的油膜厚度、泄漏量及摩擦力等密封性能参数，分析表面粗糙度对矩形密封圈的润滑状态和泄漏量的影响。结果表明：往复运动速度一定时，随着密封圈粗糙度的增加，密封偶合面的润滑状态由流体润滑转变为润滑润滑状态，密封的泄漏量也呈几何式增加，说明粗糙度对密封圈的工作寿命和密封性能有较大的影响；往复运动速度也是影响矩形密封圈密封性能的关键工作参数之一，密封压力一定时，随着粗糙度的增加，不发生泄漏的临界速度降低。

Effect of Surface Roughness on Dynamic Sealing Performance of Rectangular Elastomeric Seals

Based on the numerical calculation flow of sealing property coupling of the elastic deformation, hydrodynamics and interference contact, the dynamic seal performances calculation of rectangular elastomeric seal was realized by using Matlab software to program, and the parameters of oil film thickness, leakage and friction were got. The influence of surface roughness on the lubrication state and leakage was analyzed.The calculation results show that when the reciprocating velocity is constant, the lubrication state between sealing part and shift surface is changed from fluid lubrication into mixed lubrication with the increase of sealing ring roughness, and the leakage of sealing is also increased in a geometric, indicating that the roughness of seals has important influence on the serve life and sealing performance of the sealing ring. Reciprocating motion speed is also one of the key parameters that affect seal performance of rectangular sealing ring, when sealing pressure is certain, the critical speed for no leakage is reduced with the increase of sealing roughness.