Gas-liquid two-phase flow phase interface density calculation method, device and equipment and storage medium

Abstract

The invention discloses a gas-liquid two-phase flow phase interface density calculation method, device and equipment and a storage medium. The existing method for calculating the phase interface density by adopting an algebraic phase interface density model or a phase interface density transport equation has the problems of poor precision and poor applicability. According to the invention, a large number of drift velocity models developed for different channel structures and flow forms are introduced; on the premise of high completeness and high precision of the drift velocity model, the phase interface density model obtained by using the drift velocity model has relatively high precision; the applicability to different channel types and flow patterns is realized; the invention has good applicability to complex flow patterns such as elastic flow, stirring and mixing flow, annular flow and the like in horizontal or vertical round pipes and rod bundle channels. The defects of poor precision of transition simplification of an algebraic model and poor applicability of a phase interface transportation model are overcome.

Description

technical field [0001] The invention belongs to the technical field of two-phase fluid mechanics, and in particular relates to a method, device, equipment and storage medium for calculating the interface density of a gas-liquid two-phase flow. Background technique [0002] Gas-liquid two-phase flow is an important flow and heat transfer phenomenon in thermal and nuclear energy systems. The gas and liquid two-phase flow occurs through the phase interface for heat and mass transfer. According to the volume fraction and distribution of gas and liquid two-phase, gas-liquid two-phase flow can be divided into various flow patterns such as bubbly flow, slug flow, turbulent flow, annular flow, and diffuse flow. Different flow regimes have different phase interface structures and densities, which have complex effects on heat and mass transfer between phases. Studying and accurately predicting the density of the phase interface is the key basis for the study of two-phase flow. Genera...

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Problems solved by technology

However, this equation considers the change of the volume fraction of each phase in the two-phase flow and the appearance or disappearance of the phase interface density caused by the change of the phase interface structure through the source term, which must be obtained in advance when solving the phase interface density transport equation However, the source term of the phase interface is affected by microscopic parameters such as local flow field curl and turbulence around the bubbles. The current experimental methods still cannot obtain accurate two-phase microscopic flow field structures, especially in medium and high cavitation bubbles. In the case of share, the two-phase flow field structure is extremely complex, and the experiment cannot quantitatively measure the local flow field structure

The existing phase interface density source term models are mostly based on simplified theoretical derivation or bubbly flow experiments with low cavitation fraction. The applicability of the model in the bubbly flow region is acceptable, but it is still not suitable for complex flow patterns such as slug flow and intermittent flow. Not applicable

In addition, when solving the phase interface density transport equation, the inlet boundary condition needs to be given, that is, the inlet phase interface density distribution, but this parameter is still unknown, and the setting of this parameter in the solution process is relatively arbitrary.

Based on the above analysis, it can be seen that the calculation of phase interface density based on the phase interface density transport equation has the problems of narrow range of use of the model and incomplete auxiliary models.

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