Two-Dimensional Numerical Simulation Analysis of Water Injection Characteristics of Passive Core Makeup System
This paper employs computational fluid dynamics(CFD)methodology to conduct a two-dimensional simulation analysis of the gravity-driven water injection process in the passive core makeup water system.Validation of key physical phenomena and models such as steam direct contact condensation,phase change,heat transfer,thermal stratification and density difference driving force in water injection process is carried out.Sensitivity analysis is carried out on the influence of diffuser setting and boundary conditions of different working conditions on water injection rate.The correlation analysis results are in good agreement with the accident analysis results of the verified system-level analysis software,which lays a good foundation for further analysis and scheme evaluation combined with engineering requirements.
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