Calculation Method for Hydraulic Shock in a Pipeline Considering Cavitation Phenomena in Openfoam Software Package

Ivanov, Evgeniy; Klyuyev, A. S.; Жарковский, А. А.; Borshchev, I. O.

doi:10.1051/e3sconf/202132004015

E3S Web Conf.

2021

DOI: 10.1051/e3sconf/202132004015

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Calculation Method for Hydraulic Shock in a Pipeline Considering Cavitation Phenomena in Openfoam Software Package

Evgeniy Ivanov

A. S. Klyuyev

А. А. Жарковский

et al.

Abstract: Hydraulic shock that occurs in pipeline systems can cause accidents and destroy pipelines, valves and equipment. If the pressure fluctuates due to a hydraulic shock, the pressure in the rarefaction phase may drop below the pressure of saturated vapours, resulting in a cavitation. This phenomenon is accompanied by an additional increase in the amplitude of pressure fluctuation, which leads to additional loads occurring in the hydraulic system. The aim of the paper is to provide the method for calculation of the… Show more

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2024

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Lubrication mechanism analysis of textures in journal bearings using CFD simulations

Wang,

Jacobs,

Zhang

et al. 2024

ILT

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Purpose This paper aims to study the lubrication mechanism of textured journal bearings. Design/methodology/approach CFD models for textured journal bearings are established. The effect of texture coverage on the pressure distribution is studied to find the proper texture distribution. To enhance the local load-carrying capacity at textures, the micro-hydrodynamic pressure and microflow at different texture depth ratios are captured. The interaction between the texture-induced microflow and the bearing lubrication film is analyzed from the microflow perspective. Findings The bearing performance is on the one hand enhanced by the micro-hydrodynamic pressure generated by textures. On the other hand, the main bearing land and maximum pressure can be interfered by textures, leading to the reduction of load-carrying capacity. To minimize the interference effect, textures are suggested to distribute downstream of the minimum film thickness location. As the lubrication film thickness increases, the corresponding optimum texture depth ratio rises. The vortices influence the local flow rate through the lubrication film at textures and further affect the micro-hydrodynamic pressure and local load-carrying capacity. The texture depth ratio, at which vortices begin to occur, generates the maximum micro-hydrodynamic pressure. Originality/value The proper texture distribution is introduced, which is capable to generate the micro-hydrodynamic pressure without interfering with the primary load-carrying capacity of the bearing. The microflow effect is found to considerably influence the local load-carrying capacity at textures. The necessity of sub-regional optimization in textured journal bearings is pointed out. This study provides the fundamental reference for the design and optimization of textured journal bearings.

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Lubrication mechanism analysis of textures in journal bearings using CFD simulations

Wang,

Jacobs,

Zhang

et al. 2024

ILT

View full text Add to dashboard Cite

show abstract

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Calculation Method for Hydraulic Shock in a Pipeline Considering Cavitation Phenomena in Openfoam Software Package

Cited by 1 publication

References 2 publications

Lubrication mechanism analysis of textures in journal bearings using CFD simulations

Lubrication mechanism analysis of textures in journal bearings using CFD simulations

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