Doroshenko, Ya. V. та Karpash, O. M. та Rybitskyi, I. V. (2020) INVESTIGATION OF DISPERSED CONTAMINATES INFLUENCE ON THE HYDRAULIC ENERGY CONSUMPTION OF ELEMENTS OF GAS PIPELINE SYSTEMS WITH COMPLEX GEOMETRY. Topical scientific researches into resource-saving technologies of mineral mining and processing. с. 182-207.

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Title in English

INVESTIGATION OF DISPERSED CONTAMINATES INFLUENCE ON THE HYDRAULIC ENERGY CONSUMPTION OF ELEMENTS OF GAS PIPELINE SYSTEMS WITH COMPLEX GEOMETRY

English abstract

The subject of the research is the energy losses of gas pipeline sys-tems of complex geometry (bends, tees) with consideration of different operational parameters (pressure, velocity of two-phase flow, volume fraction of the disperse phase). Methodology. CFD (computational fluid dynamics) simulation was used to per-form the research, which included a set of physical, mathematical and numerical methods designed to calculate the characteristics of gases and liquids. CFD model-ing was performed in ANSYS Fluent R19.2 Academic software. The Eulerian ap-proach and the Mixture model were used. The purpose of the research is to determine the dependence of hydraulic energy losses of two-phase gas flow in elements of gas pipelines with complex geometry on the transmission mode of parameters, dispersed phase characteristics and the geometric parameters of the studied elements. Research results. It is established that energy losses of gas pipeline systems elements with complex geometry are significantly influenced by the volume fraction of the dispersed phase. The most significant effect of such volume fraction was observed in bends with a large angle and a small bending radius. In particular, pressure drop values at the outlets increased at high multiphase flow velocities and low pressures. Also, the energy losses of two-phase flow in small diameter bends are significantly increased. With regard to tees, their hydraulic energy loss is affected by the volume frac-tion of the dispersed phase when the rounding radius of the connection between main line and the branch is the smallest or no rounding is present at all (welded branches). The increase in the volume fraction of the dispersed phase leads to a sig-nificant increase in pressure drop values in the tees, where the gas flow from the line transfers completely into the branch.

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