Modeling and Simulation Analysis on Mixing Characteristics of Two-Phase Flow Around Spacer Grid

The spacer grid has a significant impact on the thermal-hydraulic characteristics of rod bundle channel, which directly determines possibility boiling crisis. multi-phase flow model coupling is proposed to acquire secondary and void fraction for subcooled in fuel assembly. Compared with experimental data, RNG k–ε turbulence selected current research. In addition, parameters 5 × are studied focusing influence different arrangements mixing vanes. It found that distribution vapor phase greatly influenced by intensity direction flow. thermal–hydraulic sub-channels around rods investigated, demonstrates uniform crossflow makes harder accumulate rods. Furthermore, types grids also discussed detail.