Numerical analysis of three lobe hydrodynamic journal bearing using CFD–FSI technique based on response surface evaluation

Dhande, D. Y.; Pande, D. W.; Lanjewar, G. H.

doi:10.1007/s40430-018-1311-5

Cited by 17 publications

(5 citation statements)

References 24 publications

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“…They concluded that the multiphase flow analysis along with cavitation and FSI is significant for the journal bearings operating at high speeds. In the other research, Dhande et al [21] simulated lobe hydrodynamic journal bearings using two-way FSI based on the response surface optimization. The main objective was to study the effects of eccentricity ratio and rotational speeds on the pressure distribution.…”

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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“…• Assumption of an initial value of φ and g in the active region for the first iteration. • Obtaining the film thickness at each node from Equation (7).…”

Section: Computational Algorithmmentioning

confidence: 99%

“…The efficiency of journal bearing surface texturing was determined by a fluid flow model in a single micro-scale irregularity unit cell implemented by de Kraker et al [6] using Navier-Stokes equations rather than Reynolds equation. Dhande et al CFD-FSI technique presented in [7] was used by Meng et al [8] to investigate the influence of a complex dimple on the tribological behaviour of the journal bearing. It was found that depending on the geometry and size of the compound dimples, as well as the bearing's operating parameters, a higher load might be followed by a lower coefficient of friction.…”

Section: Introductionmentioning

confidence: 99%

Effect of microridges on the performance of three-lobe journal bearing considering cavitation and lubricant compressibility

Abass,

Mahdi

2023

tribomat

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This study presents a numerical study of the effect of microridges on the performance of the three-lobe journal bearing considering lubricant compressibility and cavitation effects. A mathematical model based on the Reynolds equation that has been modified to take into account the effects of lubricant compressibility and cavitation has been proposed to achieve the primary goal of this work. Lubricant compressibility is considered by using lubricating oils with different bulk moduli while Elord's algorithm was used to consider the effect of cavitation. The governing equations for finite length journal bearing lubricated with Newtonian oil in laminar flow and isothermal condition are numerically discretised using the finite difference method and solved by using a suitable prepared computer program. The performance of the rough and smooth bearings was compared for plain and three-lobe journal bearings. The numerical model was demonstrated by comparing the pressure distribution for smooth and microridges three-lobe journal bearing with that published by El-Said et al. and they were found in good agreement. It was found that the pressure and the load were considerably enhanced and the coefficient of friction decreased by 15 % for three-lobe journal bearing with microridges in comparison with that of smooth surfaces.

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“…It was concluded that including the effect of bearing microroughness enhanced the load-carrying capacity of such a bearing. Dhande et al [10] used the CFD approach to analyze the elastohydrodynamic lubrication of three-lobe journal bearing. The obtained results were validated against the experimental results and they were found to be in the expected range.…”

Section: Introductionmentioning

confidence: 99%

Archive of Mechanical Engineering

Mahdi,

Abbas

2022

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Different configurations of journal bearings have been extensively used in turbomachinery and power generating equipment. Three-lobe bearing is used due to its lower film temperature and stable operation. In this study, static performance of such a bearing has been investigated at different eccentricity ratios considering lubricant compressibility and variable viscosity. The effect of variable viscosity was considered by taking the viscosity as a function of the oil film thickness while Dowson model is used to consider the effect of lubricant compressibility. The effect of such parameters was considered to compute the oil film pressure, load-carrying capacity, attitude angle and oil side leakage for a bearing working at (ε from 0.6 to 0.8) and (viscosity coefficient from 0 to 1). The mathematical model as well as the computer program prepared to solve the governing equations were validated by comparing the pressure distribution obtained in the present work with that obtained by EL-Said et al. A good agreement between the results has been observed with maximum deviation of 3%. The obtained results indicate a decrease in oil film pressure and load-carrying capacity with the higher values of viscosity coefficient while the oil compressibility has a little effect on such parameters.

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Numerical analysis of three lobe hydrodynamic journal bearing using CFD–FSI technique based on response surface evaluation

Cited by 17 publications

References 24 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

Effect of microridges on the performance of three-lobe journal bearing considering cavitation and lubricant compressibility

Archive of Mechanical Engineering

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