Chinese Journal of Mechanical Engineering >

2018 , Vol. 31 >Issue 2: 27 - 27

DOI: https://doi.org/10.1186/s10033-018-0224-7

Intelligent Manufacturing Technology

Application of Fractal Contact Model in Dynamic Performance Analysis of Gas Face Seals

  • Song-Tao Hu ,
  • Wei-Feng Huang ,
  • Xiang-Feng Liu ,
  • Yu-Ming Wang
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  • 1. State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China;
    2. State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China

收稿日期: 2016-05-08

  网络出版日期: 2019-07-23

基金资助

Supported by China Postdoctoral Science Foundation (Grant No. 2017M621458), National Science and Technology Support Plan Projects (Grant No. 2015BAA08B02), National Natural Science Foundation of China (Grant No. 11632011), and National Natural Science Foundation of China (Grant No.11372183)

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Application of Fractal Contact Model in Dynamic Performance Analysis of Gas Face Seals

  • Song-Tao Hu ,
  • Wei-Feng Huang ,
  • Xiang-Feng Liu ,
  • Yu-Ming Wang
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  • 1. State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China;
    2. State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China

Received date: 2016-05-08

  Online published: 2019-07-23

Supported by

Supported by China Postdoctoral Science Foundation (Grant No. 2017M621458), National Science and Technology Support Plan Projects (Grant No. 2015BAA08B02), National Natural Science Foundation of China (Grant No. 11632011), and National Natural Science Foundation of China (Grant No.11372183)

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摘要

Fractal theory provides scale-independent asperity contact loads and assumes variable curvature radii in the contact analyses of rough surfaces, the current research for which mainly focuses on the mechanism study. The present study introduces the fractal theory into the dynamic research of gas face seals under face-contacting conditions. Structure-Function method is adopted to handle the surface profiles of typical carbon-graphite rings, proving the fractal contact model can be used in the field of gas face seals. Using a numerical model established for the dynamic analyses of a spiral groove gas face seal with a flexibly mounted stator, a comparison of dynamic performance between the Majumdar-Bhushan (MB) fractal model and the Chang-Etsion-Bogy (CEB) statistical model is performed. The result shows that the two approaches induce differences in terms of the occurrence and the level of face contact. Although the approach distinctions in film thickness and leakage rate can be tiny, the distinctions in contact mechanism and end face damage are obvious. An investigation of fractal parameters D and G shows that a proper D (nearly 1.5) and a small G are helpful in raising the proportion of elastic deformation to weaken the adhesive wear in the sealing dynamic performance. The proposed research provides a fractal approach to design gas face seals.

关键词： Fractal theory; Asperity contact; Gas face seal; Dynamic performance

本文引用格式

Song-Tao Hu , Wei-Feng Huang , Xiang-Feng Liu , Yu-Ming Wang . Application of Fractal Contact Model in Dynamic Performance Analysis of Gas Face Seals[J]. Chinese Journal of Mechanical Engineering, 2018 , 31(2) : 27 -27 . DOI: 10.1186/s10033-018-0224-7

Abstract

Fractal theory provides scale-independent asperity contact loads and assumes variable curvature radii in the contact analyses of rough surfaces, the current research for which mainly focuses on the mechanism study. The present study introduces the fractal theory into the dynamic research of gas face seals under face-contacting conditions. Structure-Function method is adopted to handle the surface profiles of typical carbon-graphite rings, proving the fractal contact model can be used in the field of gas face seals. Using a numerical model established for the dynamic analyses of a spiral groove gas face seal with a flexibly mounted stator, a comparison of dynamic performance between the Majumdar-Bhushan (MB) fractal model and the Chang-Etsion-Bogy (CEB) statistical model is performed. The result shows that the two approaches induce differences in terms of the occurrence and the level of face contact. Although the approach distinctions in film thickness and leakage rate can be tiny, the distinctions in contact mechanism and end face damage are obvious. An investigation of fractal parameters D and G shows that a proper D (nearly 1.5) and a small G are helpful in raising the proportion of elastic deformation to weaken the adhesive wear in the sealing dynamic performance. The proposed research provides a fractal approach to design gas face seals.

Key words： Fractal theory; Asperity contact; Gas face seal; Dynamic performance

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