化工学报 ›› 2022, Vol. 73 ›› Issue (12): 5526-5536.DOI: 10.11949/0438-1157.20221175

• 表面与界面工程 • 上一篇    下一篇

浮环密封端面分形磨损预估模型及数值分析

张志敏1,2(), 丁雪兴1(), 张兰霞1, 力宁3, 司佳鑫3   

  1. 1.兰州理工大学石油化工学院,甘肃 兰州 730050
    2.青海民族大学土木与交通工程学院,青海 西宁 810007
    3.中国航发湖南动力机械研究所,湖南 株洲 412002
  • 收稿日期:2022-08-25 修回日期:2022-10-27 出版日期:2022-12-05 发布日期:2023-01-17
  • 通讯作者: 丁雪兴
  • 作者简介:张志敏(1990—),男,博士研究生,讲师,zhangzhimin0911@163.com
  • 基金资助:
    宁波市“科技创新2025”重大专项(2020Z112)

Fractal wear prediction model and numerical analysis of floating ring seal face

Zhimin ZHANG1,2(), Xuexing DING1(), Lanxia ZHANG1, Ning LI3, Jiaxin SI3   

  1. 1.College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China
    2.School of Civil Engineering and Transportation, Qinghai Nationalities University, Xining 810007, Qinghai, China
    3.AECC Hunan Aviation Powerplant Research Institute, Zhuzhou 412002, Hunan, China
  • Received:2022-08-25 Revised:2022-10-27 Online:2022-12-05 Published:2023-01-17
  • Contact: Xuexing DING

摘要:

针对航空发动机石墨浮环密封端面磨损问题,基于修正的分形接触理论及Archard磨损理论,从微观角度推导出石墨浮环密封端面的分形磨损预估模型,并采用文献实验数据验证模型的合理性。最后通过数值仿真方法分析研究表面形貌参数及工况参数对浮环密封端面磨损率的影响规律。研究结果表明:石墨浮环密封端面磨损率随着分形维数的增加,先增大后减小,当分形维数处于1.45~1.65时存在最小磨损率;当分形维数一定时,石墨浮环密封端面的磨损率随表面特征尺度、摩擦因数及浮环滑移速度的增大而增大;石墨浮环密封端面的磨损率主要与频率指数最小等级及后续的7个等级微凸体相关,其余微凸体对整个浮环密封端面的磨损率影响可忽略不计。

关键词: 分形, 浮环密封, 磨损, 接触模型, 数值分析

Abstract:

Aiming at the end face wear of graphite floating ring seal of aero-engine, based on the modified fractal contact theory and Archard wear theory, the fractal wear prediction model of graphite floating ring seal end face is derived from the microscopic point of view, and the test data of literature is used to verify the rationality of the model. Next, numerical simulations were then adopted to analytically study the influence of surface contour parameters and working conditions on the rate of surface wear. The results show that the rate of surface wear first increased before decreasing with fractal dimension, reaching its minimum when the fractal dimension lies between 1.45 and 1.65. Moreover, keeping the fractal dimension constant proves to raise the rate of surface wear with increasing magnitudes of surface feature parameters, friction coefficient and sliding speed of floating ring. The rate of surface wear is mainly related to the smallest level of the frequency component and the seven successive levels of asperities thereafter. By contrast, the influence of the remaining asperities on the overall surface wear rate is negligible.

Key words: fractal, floating ring seal, attrition, contact model, numerical analysis

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