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Structure effect of a suction pipe on slag-discharging performance in a shaft boring machine

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Abstract

The efficiency and stability of shaft boring machines depend critically on the slag-discharging system. In this study, we simulate the slagging process by using the coupled computational fluid dynamics/discrete element method and validate the method’s reliability through experiments. We investigate the impact of outlet diameter, inlet diameter, and outlet section length on slag-discharging performance. We establish the slag-discharging principle of the suction pipe by analyzing the particle motion trajectory. The flow field close to the suction pipe can be classified into collecting and lifting zones on the basis of the main flow direction velocity. Furthermore, we propose pipes with seven typical types, among which the straight-conical type exhibits the most favorable slag-discharging performance. The straight-conical pipe enhances the slag-discharging mass by 22.49 % compared with the straight pipe.

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Abbreviations

α f :

Fluid volume fraction

t :

Time

u f :

Fluid velocity

P :

Fluid pressure

ρ :

Fluid density

T :

Volume-averaged shear stress tensor

R pf :

Equivalent tensor for the momentum transfer between the two phases representing interaction forces

m p :

Particle mass

u p :

Particle velocity

g :

Gravitational acceleration

Fc :

Contact force

Fd :

Drag force

F L :

Lifting force

Fvm :

Virtual mass force

Fp :

Pressure gradient force

Ip :

Moment of inertia

ω p :

Angular velocity

Md :

Drag torque

Mc :

Total moment from contact forces

T :

Shear stress

T 0 :

Yield stress

μ :

Plastic viscosity

γ :

Shear rate

C D :

Drag coefficient

r p :

Particle radius

D :

Outlet diameter

d :

Inlet diameter

L a :

Outlet section length

L b :

Inlet section length

C x :

Flow direction coefficient X

C y :

Flow direction coefficient Y

F d :

Drag force

r p :

Particle radius

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Acknowledgments

This work is supported by the special fund of the National Key R&D Program of China (Grant No. 2022YFC3802301), the Construction of Innovative Provinces in Hunan Province (No. 2019GK1010), the Independent Exploration and Innovation Project of Central South University (No. 2020zzts100), and the project of the State Key Laboratory of Precision Manufacturing for Extreme Service Performance (No. ZZYJKT2021-15).

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Correspondence to Laikuang Lin or Xuemeng Xiao.

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Xuemeng Xiao is a doctoral student in mechanical engineering in Central South University, Changsha, China. Her research interests include slurry shield circulation systems and flow field flow problems in slurry shield excavation.

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Jiang, H., Lin, L., Wen, Z. et al. Structure effect of a suction pipe on slag-discharging performance in a shaft boring machine. J Mech Sci Technol 37, 4647–4659 (2023). https://doi.org/10.1007/s12206-023-0820-z

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  • DOI: https://doi.org/10.1007/s12206-023-0820-z

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