针对干气密封摩擦界面复杂多变的弹塑性变形阶段，基于微凸体在变形全过程满足连续性、光滑性和单调性的特点，通过余弦函数来探究了接触面变形量与接触特性之间的关系，建立了具有光滑连续特性的微凸体弹塑性接触模型，然后基于统计学理论，建立了摩擦界面整体接触模型，最后将所建立的模型与GW模型、CEB模型、ZMC模型、KE模型和LIN模型五种经典模型进行对比分析，并通过理论分析与数值求解得到干气密封摩擦界面的力学特性及影响因素。结果表明：本文模型实现了微凸体在变形全阶段的连续性、光滑性和单调性；接触载荷、接触面积和接触刚度与无量纲接触变形量成正相关；与无量纲表面平均接触距离成负相关，且无量纲表面平均接触距离越小，其粗糙表面发生塑性变形的比重就越大；为使干气密封动环和静环更加可靠平稳地运行，应保证动环和静环的接触面尽量光滑平整，使其无量纲表面平均接触距离控制在2.5以下。
Abstract
Aiming at the complex and changeable elastoplastic deformation stage of the dry gas seal friction interface, based on the characteristics of the asperities satisfying continuity, smoothness and monotonicity in the whole deformation process, the cosine function was used to explore the relationship between the contact surface deformation and the contact characteristics. Then, based on the statistical theory, the overall contact model of the friction interface is established. Finally, the established model is compared with the GW model, CEB model, ZMC model, KE model. Compared with the five classic models of the LIN model, the mechanical properties and influencing factors of the dry gas seal friction interface are obtained through theoretical analysis and numerical solution. The results show that: the model in this paper realizes the continuity, smoothness and monotonicity of the asperity in all stages of deformation; the contact load, contact area and contact stiffness are positively related to the dimensionless contact deformation; and the average contact distance of the dimensionless surface is negative. Correlation, and the smaller the average contact distance of the dimensionless surface, the greater the proportion of plastic deformation of the rough surface; in order to make the dry gas seal moving ring and static ring operate more reliably and smoothly, the contact surface between the moving ring and the static ring should be guaranteed. Try to be as smooth and flat as possible, so that the average contact distance of the dimensionless surface is controlled below 2.5.
关键词
干气密封 /
接触模型 /
弹塑性阶段 /
接触刚度 /
统计学理论
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Key words
dry gas seal /
contact model /
elastic-plastic stage /
contact stiffness /
statistical theory
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