액체수소 누출에 기인한 수소 증기운 확산 및 폭발에 대한 전산해석 연구

Abstract

Computational analysis was performed on the hydrogen leakage, vapor dispersion and fire & explosion of hydrogen vapor cloud using the FLACS-CFD code for the liquid hydrogen leakage experiment. Unsteady Reynolds-averaged Navire-Stokes (RANS) approach for the turbulent dispersion in large open space was adopted in the computation. The computational analysis results showed that the concentration was kept constant except for the initioal stage while the hydrogen concentration measured in the experiment showed very large perturbations over time. and also gas leakage and liquid pool formation are simultaneously considerd for suggesting to solve two-phase liquid hydrogen leakage in FLACS. There was no significant difference in computed performance with only gas phase leakage, and it can be considered as applicability as one methodology to slove two-phase leakage. By locating ignition source into the dispersed hydrogen vapor cloud, over-pressure and temperature was predicted. and also by introducing damage threshold on humans and buildings with P-I diagram, the risk probability was predicted at the nearside of ignition source and leakage source.