Numerical Simulation of Lubrication Characteristics of Journal Bearings Under Oil-air Mixed Lubrication

doi:10.19596/j.cnki.1001-246x.8553

Abstract

Abstract:

With assumption that the lubricant is a mixture of fluid and bubble nuclei and its distribution is homogeneous, we introduce a dynamic model of cavitation and couple it with Reynolds equation of hydrodynamic lubrication of plain bearings. The model under lubrication state is sovled with numerical simulation. Euler method, a 4-5th order Runge-Kutta method and a finite difference method are used to explore effect of initial gas content on axis trajectory and lubrication characteristics.

Key words: bubble dynamics, Reynolds equation, oil-gas two-phase flow lubrication, lubrication characteristics

Liqing FANG, Hao ZHANG, Sushuang SHI, Mingchuan WANG, Dongliang CHEN, Zhanqun SHI. Numerical Simulation of Lubrication Characteristics of Journal Bearings Under Oil-air Mixed Lubrication[J]. Chinese Journal of Computational Physics, 2023, 40(1): 47-56.

Figures/Tables 10

Fig.1 Forces on a bubble's wall

Fig.2 A schematic of bearing center position and oil film thickness

Fig.3 Flow chart of numerical calculation

Fig.4 Circumferential oil film pressure distribution

Table 1 Main parameters of journal bearing

参数	数值
轴承长度/m	0.06
轴承间隙/m	0.000 1
轴颈半径/m	0.02
轴瓦半径/m	0.020 1

Table 2 Main parameters of lubricating oil

参数	数值
润滑油密度/(kg·m^-3)	9.2 × 10³
润滑油气体密度/(kg·m^-3)	0.012
润滑油黏度/(Pa·s)	0.012
表面张力/(N·m^-1)	0.0324
饱和蒸气压/(Mpa)	8.6 × 10^-3
表面膨胀粘度/(N·s·m^-1)	7.85 × 10^-4

Fig.5 Journal whirl orbit at 30 rad ·min-1

Fig.6 Journal whirl orbit at 3 000 rad ·min-1

Fig.7 Effect of void fraction on bearing capacity at 30 rad ·min-1

Fig.8 Effect of void fraction on bearing capacity at 3000 rad ·min-1

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