Numerical Analysis of Hydrodynamic Journal Bearing Lubrication using Computational Fluid Dynamics and Fluid Structure Interaction Approach

Dhande, D. Y.; Pande, D. W.

doi:10.4273/ijvss.8.4.08

Cited by 4 publications

(4 citation statements)

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“…Schweizer [13], in a numerical study, showed that the full floating ring in the journal bearing causes two types of oil film instability internally and externally. Dhande et al [14] dealt with behavioral analysis of the journal bearing using the structure-fluid interaction method and concluded that the combinatory effect of the hydrodynamic force and the elastic behavior resulting from bearing forces shows the deformation of the bearing, and should be considered in order to predict the exact bearing performance in unstable bearing conditions. Gao et al [15] numerically investigated the eccentricity effects of the shaft on the pressure distribution of the water film with different bearing dimensions and rotational speeds and discussed the possibility of instability in the water film.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of the oil whirl phenomenon in a hydrodynamic journal bearing

Hekmat

Biukpour

2019

J Braz. Soc. Mech. Sci. Eng.

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The journal bearings are one of the main components of the rotating machines and always bear considerable weight and dynamic stresses. Bearing defect may cause bending and eventually axis fracture and, in some cases, lead to an increase in the temperature of other components. One of the most important challenges of this type of bearings is the instability of the oil film layer, which appears as oil whirl and oil whip. The main objective of this research is the numerical analysis of the journal bearing of a centrifugal pump and the investigation of variations in the eccentricity and the rotation of the bearing to detect the instability resulting from the oil whirl and whip. For this purpose, assuming the steady and laminar flow, the Reynolds theory modified by the Elrod-Adams cavitation model is utilized. In addition, the finite element method is used for the numerical solution. The results indicate that the pressure on the bearing shell increases considering the effect of the oil whip phenomenon. Moreover, by increasing the eccentricity ratio, the pressure applied to the bearing increases and the mass fraction of the oil film decreases. After that, in order to improve the performance, by creating a horizontal groove in a simple bearing (without groove), the oil whirl and whip are numerically analyzed and the effect of the eccentricity as well as the rotational speed of the modified bearing is investigated. Numerical results indicate that the presence of the groove in the bearings causes the pressure on the grooved bearings to decrease dramatically. As a result, the probability of occurrence of the oil instability phenomenon in this case will be less than simple state (no groove). In addition, in this case, it could be observed that as the rotational speed of the grooved bearing increased, the pressure applied around the groove bearing from the oil film increases. However, the pressure applied to the grooved bearings is much less than the pressure applied to the simple bearings.

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Section: Introductionmentioning

confidence: 99%

Numerical study of the oil whirl phenomenon in a hydrodynamic journal bearing

Hekmat

Biukpour

2019

J Braz. Soc. Mech. Sci. Eng.

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“…Their results for the oil bearing compared closely with those of a Reynolds model and an analytical solution, but no such comparisons were made for the water bearing. Dhande et al [16] developed a CFD model along with FSI to calculate pressures in a laminar oil film including the effects of surface deformation. Their results showed significant pressure-induced surface deformation, especially at high journal eccentricities.…”

Section: Introductionmentioning

confidence: 99%

A two-way FSI analysis of multiphase flow in hydrodynamic journal bearing with cavitation

Dhande¹,

Pande²

2017

J Braz. Soc. Mech. Sci. Eng.

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Abbreviations e Eccentricity between shaft and bearing, m C Radial clearance, m R Radius of the shaft, m h Film thickness, m ω Angular velocity, rad/sec W Load carrying capacity, N O' Bearing centre O Shaft centre ρ Fluid density, kg/m 3 ρ l Liquid density, kg/m 3 ρ v Vapor density, (kg/m 3) v Fluid velocity P Static pressure, Pa τ Stress tensor F External body force, N t Time ε Eccentricity ratio σ Liquid surface tension coefficient v Fluid velocity vector C e , C c Mass transfer source terms connected to the growth and collapse of the vapor bubbles, respectively F cond Condensation coefficient F evap Evaporation coefficient p v Saturation pressure of the fluid [M s ] Structural mass matrix [M f ] Fluid mass matrix [F s ] Structural force matrix [F f ] Fluid force matrix [R] Coupling matrix Δh Relative rigid displacement of the two bearing surfaces δ Total elastic deformation of the shaft and bearing system Abstract This work deals with a study of a three-dimensional CFD analysis and multi-phase flow phenomena for hydrodynamic journal bearing with integrated cavitation. The simulations are carried out considering the realistic bearing deformations by two-way fluid-structure interactions (FSI) along with cavitation using ANSYS ® Workbench software. The design optimization module is used to generate the optimized solution of the attitude angle and eccentricity for the combination of operating speed and load. Bearings with and without cavitation are investigated. A drop in maximum pressure value is observed when cavitation is considered in the bearing. The rise in oil vapor distribution is noted with an increase in shaft speed which lowers the magnitude of the pressure build up in the bearing. The bearing deformations are analyzed numerically and found increasing with an increase in shaft speed. The experimental data obtained for pressure distribution showed good agreement with numerical data along with a considerable reduction in computation time.

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“…The pre-processing of CFD [9][10][11][12][13] calculation is mainly to establish a fluid model and generate grids. Only by dividing the grids according to the actual flow field 14,15 can make CFD numerical calculation be realised successfully and efficiently.…”

Section: Bearing Fluid Finite Element Model and Mesh Divisionmentioning

confidence: 99%

Flow field analysis and structure optimization of liquid sodium hybrid bearing

Song,

Yang,

Zhang

et al. 2024

Lubrication Science

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Liquid sodium hybrid bearing is mechanical pump shaft bottom key support components, that play a balanced radial force of the impeller by fluid effect, in order to improve the bearing performance, based on the calculation model, simulation analysis, structure improvement and other aspects of analysis, this paper based on the theory of fluid mechanics of bearing finite element model for numerical calculation and analysis of flow field. Under different eccentricities and vibration velocities, the influence of structure improvement on bearing capacity is analysed. The results show that the bearing capacity of the liquid sodium hybrid bearing is mainly the hydrostatic bearing capacity, and the hydrodynamic pressure only plays an auxiliary role. After the improvement of the load‐bearing structure, the load‐bearing capacity is increased by 4%–7.3%. And the leakage is reduced by 27%–38% when the depth of the annular groove is 0.6 mm.

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Numerical Analysis of Hydrodynamic Journal Bearing Lubrication using Computational Fluid Dynamics and Fluid Structure Interaction Approach

Cited by 4 publications

References 0 publications

Numerical study of the oil whirl phenomenon in a hydrodynamic journal bearing

Numerical study of the oil whirl phenomenon in a hydrodynamic journal bearing

A two-way FSI analysis of multiphase flow in hydrodynamic journal bearing with cavitation

Flow field analysis and structure optimization of liquid sodium hybrid bearing

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