Numerical Experiments of Leaked Hydrogen Dispersion in a Hallway model with Obstacles by FDS (2nd Report)

Abstract

This report shows the results of an investigation focusing on the hydrogen concentration near the ceiling, which was not fully analyzed in the previous report. Japan has declared its goal to become carbon neutral by 2050, utilization of hydrogen is one of the leading candidates for decarbonization. For safely use of hydrogen, quick detection of leaked hydrogen is important, and also high accurate prediction system of leaked hydrogen dispersion and a system to prevent hydrogen concentration from increasing. Inoue et al. carried out hydrogen leakage and dispersion experiments using the Hallway Model, and author et al. showed that numerical simulations can accurately reproduce them. In previous report, investigated the effects of obstacles placed in the Hallway Model on the hydrogen concentration distribution. In this report shows the hydrogen concentration retained between hanging partition walls installed near the ceiling of a hallway model is investigated, and high hydrogen concentrations are observed locally near the hanging walls. It is shown that when there are obstacles such as hanging walls, a localized increase in hydrogen concentration could lead to a fire or explosion.