Tags: fluent | gőzfejlesztő

Two-phase Flow Model in the Steam Generator of a Power Plant

Because of the planned prolongation of the life cycle of the Hungarian Nuclear Power Plant the improvement of the blow-down system was decided. Our colleagues modelled the two-phase flow in the shell side of the tube bank of the steam generator, which has a critical role in the replacement of the contaminants. The circulation is influenced by several factors which has been explored by micro-models:

• 1D coupled thermo-hydraulic model of the pipes to explore unevenness of heating
• 2D cross sectional model to define the resistance of the pipes
• 3D model to define the anisotropic shell-side resistance of the tube bank

Mesh of the 3D model

A mathematical model was developed to specify the local value of slip velocity of water vapour relative to the liquid phase, while the pre-heating and vapour generation was simulated with the mixture model of ANSYS FLUENT, sources defined by UDFs (user defined functions).

Flow lines in the steam generator