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Numerical analysis on mixed lubrication performance of journal-thrust coupled microgroove bearings with different bottom shapes

关于不同底形微织构的径推一体式水润滑轴承混合润滑性能数值分析

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Abstract

The purpose of the present study is to establish a mixed lubrication model for the journal-thrust coupled microgroove bearings (also referred as coupled bearings) used for the ship shaftless rim-driven thrusters. During the hydrodynamic modelling, the coupling hydrodynamic pressure between the journal bearing and the thrust bearing is considered. The mixed lubrication performances of the microgroove journal-thrust bearing with five different bottom shapes, including rectangle, semi-ellipse, right triangle, isosceles triangle and left triangle, are compared. Based on the numerical results, the optimal microgroove bottom shape of the journal bearing and tilting angle of the thrust pad are determined. Additionally, the comparative analysis shows that the coupled bearing with left triangle microgroove bottom shape exhibits the optimal mixed lubrication performance. The numerical result also indicates that the optimal inclination angle of the thrust bearing pad is 0.01° for the current simulation case.

摘要

本研究以船舶用无轴轮缘推进器中的一体式水润滑轴承为对象, 建立径推一体式微织构水润滑轴承的混合润滑分析模型. 在流体动力建模过程中, 考虑了径向轴承部分和推力轴承部分公共边界处的耦合流体动压力. 比较了矩形、半椭圆形、右三角形、等腰三角形和左三角形五种不同底形的微织构一体式水润滑轴承的混合润滑性能. 基于数值仿真结果, 确定了当前工况条件下的最优微织构底部形状以及最佳推力盘倾斜角. 对比分析表明, 左三角形底形的微织构一体式水润滑轴承表现出了最优的混合润滑性能, 最佳的推力盘倾斜角为0.01°.

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Abbreviations

C :

Bearing clearance, mm

ε :

Eccentricity ratio

θ :

Circumferential direction

ψ :

Attitude angle, rad

φ :

Thrust pad angle, rad

R j1 :

Inner radius of the journal bearing, mm

R j2 :

Outer radius of the journal bearing, mm

R t1 :

Inner radius of the thrust bearing, mm

R t2 :

Outer radius of the thrust bearing, mm

L :

Journal bearing width, mm

h J :

Lubrication gap of the journal bearing, µm

h t :

Lubrication gap of the thrust bearing, µm

N g :

Groove number

R g :

Groove ratio

D g :

Maixmum groove depth, µm

h p :

Geometry clearance, mm

G j :

Journal bearing groove depth, µm

G t :

Thrust bearing groove depth, µm

δ j :

Journal bearing elastic deformation, µm

δ t :

Thrust bearing elastic deformation, µm

α t :

Tilting angle, rad

T coat :

Coating thickness, mm

p hj :

Hydrodynamic pressure of the Journal bearing, MPa

p ht :

Hydrodynamic pressure of the thrust bearing, MPa

ρ :

Density of the water, kg/m3

η :

Viscosity of the water, Pa·s

σ :

Composite roughness, µm

ϕ η :

Flow factor in the circumferential direction

ϕ r :

Flow factor in the radial direction

ϕ s :

Shear factor

ϕ c :

Contact factor

ω :

Rotational speed, rad/s

p c :

Contact pressure, MPa

K :

Contact coefficient

H dim :

Dimentionless lubrication gap

β :

Asperity curvature

D :

Asperity density

θ t0 :

Cavitation position of thrust bearing

θ j0 :

Cavitation position of journal bearing

E j :

Elastic modulus of the journal bearing, GPa

E s :

Elastic modulus of the shaft, GPa

E t :

Elastic modulus of the thrust bearing, GPa

ν j :

Poisson ratio of the journal bearing

ν s :

Poisson ratio of the shaft

σ s :

Surface roughness of the shaft, µm

γ :

Surface orientation

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Authors and Affiliations

  1. College of Mechanical and Vehicle Engineering, Chongqing University, Chongqing, 400044, China

    Dong-xing Tang  (唐东兴), Lei Yin  (殷雷), Bin Xiao  (肖彬), Yan-feng Han  (韩彦峰), Guo Xiang  (向果) & Jia-xu Wang  (王家序)

  2. State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing, 400044, China

    Dong-xing Tang  (唐东兴), Lei Yin  (殷雷), Bin Xiao  (肖彬), Yan-feng Han  (韩彦峰), Guo Xiang  (向果) & Jia-xu Wang  (王家序)

Authors
  1. Dong-xing Tang  (唐东兴)
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  2. Lei Yin  (殷雷)
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  3. Bin Xiao  (肖彬)
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  4. Yan-feng Han  (韩彦峰)
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  6. Jia-xu Wang  (王家序)
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Corresponding authors

Correspondence to Yan-feng Han  (韩彦峰) or Guo Xiang  (向果).

Additional information

Foundation item

Project(51975064) supported by the National Natural Science Foundation of China; Project(cstc2018jcyjAX0442) supported by the General Projects of Basic Science and Frontier Technology Research of Chongqing, China; Projects (2018M631059, 2019T120805) supported by the Postdoctoral Science Foundation of China; Project(cstc2017zdcyzdzxX0001) supported by the Major Research and Development Program of China; Project supported by the Innovation Program on the Common and Key Technologise of Key Industries, China

Contributors

WANG Jia-xu provided the idea of this research. TANG Dong-xing built the model, analyzed the results and wrote the fist draft of the manuscript. YIN Lei and XIAO Bin participated in data processing. HAN Yan-feng and XIANG Guo provided assistance on modeling and theoretical analysis. All authors participated in responding to the reviewers and revised the final version of the manuscript.

Conflict of interest

All authors declare that they have no conflict of interest.

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Tang, Dx., Yin, L., Xiao, B. et al. Numerical analysis on mixed lubrication performance of journal-thrust coupled microgroove bearings with different bottom shapes. J. Cent. South Univ. 29, 1197–1212 (2022). https://doi.org/10.1007/s11771-022-4985-x

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  • DOI: https://doi.org/10.1007/s11771-022-4985-x

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