Numerical Experiments of Leaked Hydrogen Dispersion in a Hallway model with Obstacles by FDS

Abstract

Japan has declared its goal to become carbon neutral by 2050, and various efforts are underway. Utilization of hydrogen is one of the leading candidates for decarbonization. In order to use hydrogen safely, it is necessary to quickly detect leaked hydrogen, and it is considered essential to build technology and accumulate know-how to predict hydrogen concentration with high accuracy. 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 this paper, in order to investigate the effects of obstacles placed in the Hallway Model on the hydrogen concentration distribution, numerical simulations are performed using a Fire Dynamic Simulator (FDS) under various conditions. In cases of hanging walls, the hydrogen concentration increases locally, but there is no significant change in the entire Hallway model. In cases obstacles which is placed near the floor, the turbulent flow in the Hallway model was suppressed depending on the placement location, and then hydrogen concentration increases in the upper part of the Hallway model.