Abstract
Most of the studies with respect to the use of water-lubricated journal bearing are mainly concerned with tribological performance, whereas few studies explore the noise characteristics of such bearing. In this study, the tribological and acoustic behavior of water-lubricated journal bearing is studied using a rigorous program containing combined CFD and two-way FSI procedures for simulating elastohydrodynamic simulation for a range of different bearing materials. To model cavitation in the bearing, the multiphase flow mixture model is employed, while acoustical properties are investigated through broadband noise source models. The numerical results demonstrate that the bearing deformation has a great effect on the tribological characteristics of water-lubricated journal bearing, and this effect cannot be ignored, especially in the case of bearing material with a low elasticity modulus. The results also indicate that the bearing noise is weakly sensitive to the bearing material employed. Furthermore, the effect of operating conditions such as rotational speed and eccentricity ratio on the acoustic and tribological indices are also discussed in detail.
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Abbreviations
- a o :
-
Speed of the sound (m/s)
- C :
-
Radial clearance (mm)
- d :
-
Displacement (mm)
- e :
-
Eccentricity distance (mm)
- h max :
-
Maximum film thickness (mm)
- h min :
-
Minimum film thickness (mm)
- k :
-
Turbulent kinetic energy (m2/s2)
- L B :
-
Length of the bearing (mm)
- O :
-
Center of the bearing
- O j :
-
Center of the journal
- P A :
-
Average acoustic power level (dB)
- P bl :
-
Bubble pressure (Pa)
- p v :
-
Saturation vapor pressure (Pa)
- p :
-
Hydrodynamic pressure (Pa)
- R b :
-
Outer radius of the bearing (mm)
- R bl :
-
Radius of bubble (m)
- R :
-
Inner radius of the bearing (mm)
- r :
-
Radius of the journal (mm)
- S :
-
Sommerfeld number ( \(S = \left( {r/C} \right)^{2} \left( {2\mu \omega rL_{B} /W} \right)\)
- W :
-
Load-carrying capacity
- \(\alpha\) :
-
Surface tension coefficient between the liquid and vapor (N/m)
- \(\alpha_{nuc}\) :
-
Nucleation site volume fraction
- \(\alpha_{v}\) :
-
Volume fraction of vapor
- \(\varphi\) :
-
Attitude angle (o)
- \(\theta\) :
-
Clockwise circumferential angle started from the maximum film thickness (o)
- ε :
-
Eccentricity ratio, \(\varepsilon = e/C\)
- \(\omega\) :
-
Shaft rotational speed (rpm)
- ρ :
-
Density of lubricant (kg/m3)
- ρ v :
-
Density of vapor in lubricant (kg/m3)
- μ :
-
Dynamic viscosity of lubricant (Pa.s)
- μ v :
-
Dynamic viscosity of vapor in lubricant (Pa.s)
- µ t :
-
Eddy viscosity (m2/s)
- ε d :
-
Turbulent dissipation rate (m2/s3
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Funding
This research is fully funded by University of Diponegoro through WCRU Grant, No. 118–13/UN7.6.1/PP/2021.
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Tauviqirrahman, M., Jamari, J., Bagir, M. et al. Elastohydrodynamic behavior analysis on water-lubricated journal bearing: a study of acoustic and tribological performance based on CFD-FSI approach. J Braz. Soc. Mech. Sci. Eng. 44, 1 (2022). https://doi.org/10.1007/s40430-021-03314-9
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DOI: https://doi.org/10.1007/s40430-021-03314-9