CIESC Journal ›› 2019, Vol. 70 ›› Issue (3): 1016-1026.doi: 10.11949/j.issn.0438-1157.20181062

• Surface and interface engineering • Previous Articles     Next Articles

Effect of friction pair interface micro-texture sequence on gas sealing performance

Chuangang CHEN1(),Xuexing DING1(),Junjie LU2,Weizheng ZHANG1,Jinlin CHEN1   

  1. 1. College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China
    2. Ningbo Institute of Technology, Zhejiang University, Hangzhou 315010, Zhejiang, China
  • Received:2018-09-25 Revised:2018-11-29 Online:2019-03-05 Published:2018-12-19
  • Contact: Xuexing DING E-mail:chenchuangang@163.com;xuexingding@163.com

Abstract:

The microstructures between the relatively sliding friction pair surface-interface can reduce attrition and improve lubricity. Computational domain model of cross scale lubrication film with micro-holes and micro-grooves on static and move rings were established. The lubrication film structured grids were meshed by the software ICEM with unique block mapping technology. Then the Fluent was used for numerical simulation. Taking the working conditions of the seal as the starting point, combined with the size of the micro-modeling structure, the paper discusses the four factors: the film opening force, the leakage amount, the friction coefficient of the lubricating film and the wall shearing force. The results showed that under the same medium pressure and rotational speed, the coverage ratio of micro-holes have a greater impact on the performance of gas sealing, and the increase is 5% to 8%, the gas sealing performance can achieve the best level when the coverage ratio of micro-holes is 50%. After that, the density, depth and diameter of the friction pair interface of the model were changed according to this criterion. It was found that the density and diameter of the micro-hole could significantly improve the sealing performance by 7% to 8%. And the gas seal performance can reach the best level when the micro-hole density is 12.5%, the depth is 10 μm and the diameter is 400 μm.

Key words: lubrication performance, attrition, numerical simulation, micro-texture, gas seal, structural parameters

CLC Number: 

  • TH 117

Fig.1

Geometric model of seal ring end face micro-texture"

Table 1

Structural parameters of seal ring end face micro-texture"

参数符号数值
外直径Φ0/mm27
内直径Φi /mm14
槽根直径Φg/mm23.5
槽数n12
螺旋角β/(°)74
槽深h1/μm8
气膜厚度δ/μm4
微孔密度ρ/%10
微孔深度h2/μm4
微孔直径D/μm400

Fig.2

Calculative model of micro-texture composite lubrication film (axial magnification 100 times)"

Fig.3

Meshing step of micro-texture composite lubrication film calculation model"

Fig.4

Division of grids(intercept 1/4)"

Table 2

Comparison of parameters for grid independence verification"

网格数量

最大压力

p/MPa

最大流速

v/(m·s-1)

计算时间

t/s

11786760.306827042.37539900
20425350.313993742.375402700
28622200.316516142.375416600

Fig.5

Pressure distribution of lubrication film"

Fig.6

Velocity distribution of lubrication film"

Fig.7

Wall shear force distribution of lubrication film"

Fig.8

Effect of medium pressure and micro-hole coverage ratio on gas sealing performance"

Fig.9

Effect of rational speed and micro-hole coverage ratio on gas sealing performance"

Fig.10

Effect of different micro-hole density on gas sealing performance"

Fig.11

Effect of different micro-hole depth on gas sealing performance"

Fig.12

Effect of different micro-texture diameter on gas sealing performance"

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