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Numerical investigations into the rubbing wear behavior of honeycomb seal

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Abstract

The rubbing wear behavior of the honeycomb land against labyrinth fin was investigated with finite-element-analysis method at a range of incursion conditions. The contact behaviors, material property, and material damage and failure are computed within the user-defined-subroutines. With the experimental data, the finite-element-analysis method was validated with respect to the frictional temperature and worn geometry. The effects of stator material, incursion depth, incursion rate and sliding velocity on the contact force, frictional temperature, material loss, and worn geometry are analyzed. The results show that the sliding velocity, final incursion depth and incursion rate are the important factors affecting the wear behaviors of honeycomb stator. The mushrooming extension is decreased with the increase of sliding velocity, and increased with the increase of incursion rate. At high sliding velocity and low incursion rate conditions, the material loss accounts more in the wear volume deformation compared to the plastic deformation.

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Abbreviations

b :

Width of the honeycomb wall [mm]

B :

Thickness of labyrinth fin tip [mm]

c p :

Specific heat capacity [J/(kg·K)]

D :

Diameter of the labyrinth fin tip [mm]

E :

Elasticity modulus [GPa]

F n :

Contact force [N]

h :

Depth of honeycomb cell [mm]

h air :

Heat transfer coefficient at air side [kW/(m2·K)]

h c :

Contact heat transfer coefficient [kW/(m·K)]

\(m_{{\rm{loss}}}^{\max }\) :

Total mass loss [mg]

s :

Incursion depth [mm]

\({\dot s}\) :

Incursion rate [mm/s]

s final :

Final incursion depth [mm]

t :

Time [s]

T :

Temperature [K]

T 1.4 :

Maximum temperature below cell tip by 1.4 mm [K]

u f :

Failure displacement [mm]

V f :

Sliding velocity of rotor [m/s]

w :

Thickness of honeycomb wall [mm]

\(W_{{\rm{loss}}}^{\max }\) :

Total mass loss percentage [-]

\(W_{{\rm{loss}}}^{4.28}\) :

Mass loss percentage within 4.28 s [-]

x :

Circumferential direction

y :

Radial direction

z :

Axial direction

α :

Thermal expansion coefficient [K−1]

δ :

Incline angle of labyrinth fin [°]

ε :

Radiation emissivity [-]

\({\overline \varepsilon ^{\rm{p}}}\) :

Equivalent plastic strain [-]

λ :

Heat conductivity [W/(m·K)]

μ :

Frictional coefficient [-]

ν :

Poisson ratio

ρ :

Density [kg/m3]

τ f :

Frictional stress [Pa]

-:

Time-averaged value

CFD :

Computational fluid dynamics

FEA :

Finite element analysis

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Acknowledgments

The authors are grateful for the supports by Natural Science Foundation of China (No.52076165 and No.51576151) and Natural Science Foundation of Shaanxi Province (Grant No. 2018JQ5027) for the present work.

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Authors and Affiliations

  1. 1nstitute of Turbomachinery, Xi’an Jiaotong University, Xi’an, 710049, China

    Xin Yan & Haibo Wang

  2. MOE Key Laboratory of Thermo-Fluid Science and Engineering, Xi’an Jiaotong University, Xi’an, 710049, China

    Kun He

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  1. Xin Yan
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Correspondence to Xin Yan.

Additional information

Xin Yan is a Professor at Institute of Turbomachinery, Xi’an Jiaotong University. His main research interest has been in computational fluid dynamics with emphasis in turbomachinery aerodynamics and heat transfer. He is also involved in experimental work to understand the complex flow physics in turbo machines.

Haibo Wang is a master student at Institute of Turbomachinery, Xi’an Jiaotong University. His research interests mainly cover the sealing technology in turbo-machinery.

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Yan, X., Wang, H. & He, K. Numerical investigations into the rubbing wear behavior of honeycomb seal. J Mech Sci Technol 37, 4375–4390 (2023). https://doi.org/10.1007/s12206-023-0752-7

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  • DOI: https://doi.org/10.1007/s12206-023-0752-7

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