基于分形理论的浮环密封端面法向接触刚度仿真研究  

Simulation research on normal stiffness of floating ring seal end face based on the fractal theory

作　　者：刘勇[1] 郭昊东 张青[1] 闫方超 LIU Yong;GUO Haodong;ZHANG Qing;YAN Fangchao(College of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,China;Tianjin Bool Technology Co.,Ltd.,Tianjin 300392,China)

机构地区：[1]中国民航大学航空工程学院,天津300300 [2]天津布尔科技有限公司,天津300392

出　　处：《振动与冲击》2024年第16期103-110,共8页Journal of Vibration and Shock

基　　金：中央高校基本科研业务费项目中国民航大学专项(3122024033,3122021049)。

摘　　要：浮环密封是现代航空发动机常用的密封形式之一,浮环端面的接触刚度对浮环密封辅助密封面的摩擦磨损性能有重要影响。在分形理论的基础上,基于有限元方法建立了一种新的法向接触刚度计算模型。之后通过该模型计算浮环密封端面法向接触刚度,得到了浮环密封端面法向接触刚度随压力与粗糙度的变化规律。计算结果表明:求得的法向接触刚度与粗糙表面接触试验结果吻合较好,最大相对误差不超过4%;浮环密封端面法向接触刚度随压力的增大而增加,随接触面粗糙度的增大而减小。该方法为浮环密封端面法向接触刚度的计算提供了一种新的思路。Floating ring seals are one of the commonly used sealing forms for modern aero-engines.The contact stiffness of the end face of the floating ring has an important effect on the friction and wear performance of the auxiliary sealing surface of the floating ring seal.In this paper,a new calculation model of normal contact stiffness is established on the basis of fractal model.And the normal contact stiffness of floating ring seal end face is calculated by this model.The change law of the normal contact stiffness of the floating ring seal end face with pressure and roughness is obtained.The calculation results show that the normal contact stiffness obtained by the proposed method is in good agreement with the experimental results,and the maximum relative error does not exceed 4%;the normal contact stiffness of the floating ring seal end face increases with the increase of pressure,and decreases with the increase of the roughness of the contact surface.This method provides a new method for the calculation of the normal contact stiffness of the floating ring seal end face.

关 键 词：航空发动机 浮环密封 粗糙表面 法向接触刚度 分形理论 接触力学 

分 类 号：V232.7[航空宇航科学与技术—航空宇航推进理论与工程]