トンネル内に静止した列車の屋根上機器からの水素漏洩に関する数値解析

抄録

One initiative to decarbonize railways is the development of fuel-cell vehicles. However, the practical application of fuel-cell railway vehicles requires safety confirmation, and one critical issue is hydrogen concentration assessment in the event of a hydrogen leakage in a tunnel. In this study, numerical analysis was performed to investigate the hydrogen leakage flow from a stationary railway vehicle in a tunnel. The test vehicle comprised a two-car train set with a hydrogen leakage in its roof equipment. The tunnel was a single-track mountain tunnel, 400 m in length, located on a conventional Japanese railway. The Fire Dynamics Simulator (FDS) was used for the numerical analysis. The results demonstrated that the leaked hydrogen rose toward the crown of the tunnel and flowed toward both tunnel portals. The hydrogen concentration was the highest immediately above the leakage point and rapidly decreased toward both tunnel portals.