Pressure pulsations during gas injection into a liquid-filled closed vessel with a high pressure drop

Vozhakov

Lezhnin

2021

A numerical simulation of the gas outflow to a closed region filled with liquid with a barrier disk was performed. The calculations were carried out using the VOF method, supplemented by the k-e turbulence model. Calculations were performed for three cases of 100, 200, and 300 mm distances of the disk from the injector with a gas outflow into water and liquid lead. The pulsations of axial pressure on a disk obstacle were investigated. It was found that the maximum pressure during pulsations of the upper gas volume in lead can be greater than the pressure in the gas receiver.

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research of pressure pulsations during gas outlet to closed pipe area with liquid and installed disc barrier

Vozhakov

Lezhnin

2021

“…The number of cells in the calculation area was 658800. A detailed description of the calculation methodology is presented in previous works [9,10].…”

Section: Methodsmentioning

confidence: 99%

Modeling of nonstationary gas outflow at breaks of subsea gas pipelines

Lukyanov

2021

Numerical modeling of the outflow of an air jet into water with a guillotine rupture of a pipeline by the VOF method using k-ε and k-ω SST turbulence models was carried out. The calculations were carried out in the axisymmetric approximation. The following phases of the outflow process were calculated: the formation of a large gas bubble at the place of the rupture, its growth, the separation of the bubble from the place of rupture, and the formation of a gas jet behind the bubble. It is shown that the rate of bubble detachment in the calculations by the k-ω SST model is higher than that in the calculation by the k-ε model.

Three-dimensional modeling of gas injection into a closed liquid-filled tube region

Vozhakov

Lezhnin

et al. 2020

Three-dimensional modeling of air injection into a closed pipe region filled with liquid (water, liquid lead) is carried out at high pressure drops. It is shown that in the three-dimensional calculation, the instability of the interphase surface in the form of ring waves of deformation on the upper surface of the projectile is significantly manifested. When air is injected into water, the difference in the configuration of the interphase surface obtained in axisymmetric (two-dimensional) and three-dimensional calculations is insignificant. When injected into a liquid with a substantially higher density (liquid lead), this difference is especially pronounced in the compression phase of the gas projectile.