Numerical simulation on wear-thermal-stress coupling behavior of cap-seal seal and optimization design

doi:10.3785/j.issn.1008-973X.2019.02.008

Journal of ZheJiang University (Engineering Science)

2019, Vol. 53

Issue (2): 258-267 DOI: 10.3785/j.issn.1008-973X.2019.02.008

Mechanical Engineering

Numerical simulation on wear-thermal-stress coupling behavior of cap-seal seal and optimization design

Wen-han CAO1(

),Jun GONG1,*(

),Hong-gang WANG2,Gui GAO1,2,Yuan QI1,Dong-ya YANG1

1. School of Mechanical and Electrical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China

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Abstract

The wear of the sealing surface is the key factor resulting in the declination of sealing performance and the loss of seal-life under the condition of oil free lubrication. A numerical simulation method of wear-thermal-stress coupling between seal and piston rod in the process of cap-seal (CL) sealing was established based on the finite element technique and the modified Archard wear model, and the change rule of seal performance and life in the process of wear and the effect of medium pressure on sealing characteristics were analyzed. The key structure parameters of C-ring in CL seal were optimized by applying the orthogonal design method based on the established simulation model, in order to realize the optimization target of getting minimum drop of maximum contact pressure in seal face and maximum seal-life, and the best parameter combination scheme was obtained. The results of numerical simulation and optimization design were verified by the experimental platform of Stirling engine piston rod seal performance test device, and the wear condition of contact surface of CL seal after wear was measured. The result of wear test was consistent with that of numerical simulation, and the sealing performance and life of the CL seal have been greatly improved after optimization, which confirms the accuracy of the numerical simulation method.

Key words： cap-seal (CL) seal finite element method thermal stress wear coupling structure optimization

Received: 03 April 2018 Published: 21 February 2019

CLC:

TH 137

Corresponding Authors: Jun GONG E-mail: cwh_wd@163.com;gongjjdxy@sohu.com

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Cite this article:

Wen-han CAO,Jun GONG,Hong-gang WANG,Gui GAO,Yuan QI,Dong-ya YANG. Numerical simulation on wear-thermal-stress coupling behavior of cap-seal seal and optimization design. Journal of ZheJiang University (Engineering Science), 2019, 53(2): 258-267.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2019.02.008 OR http://www.zjujournals.com/eng/Y2019/V53/I2/258

盖封密封磨损-热-应力耦合模拟与优化设计

在无油润滑工况下，密封面磨损是导致密封件性能降低及寿命丧失的关键因素. 结合有限元技术，基于修正的Archard磨损模型，建立盖封（CL）密封过程中密封件和活塞杆间的磨损-热-应力耦合数值模拟方法，分析磨损过程中密封件性能与寿命的变化规律及介质压力对密封特性的影响；基于所建立的仿真模型，采用正交试验设计法，以密封件密封面上最大接触压力降幅最小及密封件寿命最长作为优化目标，对CL密封中C形密封圈关键结构参数进行优化设计，得到最优组合方案；利用斯特林发动机活塞杆密封性能试验平台对数值模拟方法进行验证，并对磨损后CL密封接触面磨损状况进行测量，检测结果与仿真模拟结果较为一致，优化后密封件密封性能及使用寿命得到了提高.

关键词： 盖封（CL）密封, 有限元法, 热, 应力, 磨损, 耦合, 结构优化

Fig.1 Geometric model and key structural parameters of cap-seal seal

Fig.2 Finite element model of cap-seal seal

Fig.3 Von Mises stress distribution of cap-seal seal under three working conditions

Fig.4 Contact pressure distribution of cap-seal seal under three working conditions

Fig.5 Contact pressure distribution of C-ring under different medium pressures

Fig.6 Von Mises stress distribution evolution of cap-seal seal in wear operation process

Fig.7 Contact pressure distribution curve of C-ring in wear operation process

Fig.8 Node temperature curve of C-ring in wear operation process

Fig.9 Wear profile curve of C-ring in wear operation process

Fig.10 Maximum contact pressure curve of C-ring in wear operation process under different medium pressures

Tab.1 Level schedule of orthogonal experiment

Fig.11 Orthogonal experiment results of C-ring structure parameters

Fig.12 Range analysis of C-ring structural parameters

Tab.2 Comparison of structural parameters of C-ring before and after optimization

Fig.13 Structure outline of C-ring after optimal design

Fig.14 Comparison of sealing performance of C-ring before and after optimization

Fig.15 Physical map of components for cap-seal seal

Fig.16 Schematic diagram of sealing performance experimental platform for piston rod cap-seal

Fig.17 Curve of medium pressure of sealing chamber versus time

Fig.18 Comparison of wear profile of C-ring before and after optimization


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