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Comparative research on gas seal performance textured with microgrooves and microdimples

  • Liping ShiEmail author
  • Yicong Zhang
  • Si Chen
  • Wei Zhu
Technical Paper
  • 64 Downloads

Abstract

The purpose of this paper is to compare the effects of different surface texture patterns on the performance of mechanical gas seals. Firstly, two types of surface texture, i.e., the patterns of microgrooves and microdimples, are constructed, and the steady-state Reynolds equation for compressible Newtonian fluid is employed and solved considering the collective effect of adjacent textures. Then, comparative analysis of different seal parameters such as the load-carrying force, gas film stiffness and gas leakage between microgrooves and microdimples is presented. Finally, two property-evaluating parameters are defined and different texture shapes and main parameters are compared. The results indicate that texture shapes with a straight edge perform better performance than those with a round edge. Furthermore, microgrooves 2 interpenetrating high-pressure side with texture depth of 3 µm may be the best choice in engineering practice, especially under small seal clearance and high rotation speed conditions.

Keywords

Surface texture patterns Mechanical gas seals Gas lubrication Hydrodynamic effect 

List of symbols

hp

Texture depth

h0

Seal clearance

μ

Sealing gas dynamic viscosity

SP

Area density, SP = A/S

A

Area of textures

S

Area of the rotor ring face

ρ

Gas density

ri

Inner radius of the rotor ring

ro

Outer radius of the rotor ring

la

Length of the microgrooves

lb

Width of the microgrooves

a

Long semi-axes of elliptical microdimples

b

Short semi-axes of elliptical microdimples

rp

Radius of circular dimples

m

Number of microgrooves

n

Number of microdimples

ω

Rotation speed of the rotor ring (rpm)

pa

An atmospheric pressure

r

Cylindrical coordinate in radial direction

θ

Cylindrical coordinate in circumferential direction

p(r, θ)

Gas hydrodynamic pressure at point (r, θ)

h(r, θ)

Gas film thickness at point (r, θ)

Ω

Textured region

φ0

Central angle of studied area

R

Ideal gas constant, 8.31 cm3 MPa/mol K

T

Absolute temperature of this sealing system, 300 K

M

Average molar mass of gas, 29 g/mol

pI

Inlet pressure

pO

Outlet pressure

w

Load-carrying force

k

Gas film stiffness

q

Gas leakage

W

Dimensionless load-carrying force

K

Dimensionless gas film stiffness

Q

Dimensionless gas leakage

EW

Property-evaluating parameter

EK

Property-evaluating parameter

\( E_{{W_{ {\rm max} } }} \)

Maximum property-evaluating parameter

\( E_{{K_{ {\rm max} } }} \)

Maximum property-evaluating parameter

Notes

Acknowledgements

The authors are grateful for the financial support provided by the Natural Science Foundation of Anhui Province of China (1708085QE113) and Foundation for Outstanding Young Talents of Higher Education of Anhui Province (gxyq2019018).

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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2019

Authors and Affiliations

  1. 1.School of Mechanical EngineeringAnhui University of TechnologyMa’anshanChina

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