AbstractUnderground tunnels form an important part of modern road transportation systems. As the development of hydrogen cars advances into the market place, it is unavoidable that in the near future that hydrogen cars will become users of ordinary road tunnels. This paper discusses potential fire scenarios and fire hazards of hydrogen cars in road tunnels and implications on fire safety measures and ventilation systems in existing tunnels. Hydrogen has a low ignition energy, and wide flammable range suggesting that leaks have a high probability of ignition and result in hydrogen flame. Computational fluid dynamics (CFD) simulations of hydrogen jet flame in a full scale 5m by 5m square cross-section tunnel were carried out. The effect of the ventilation on controlling the upstream backlayering and the downstream flame were discussed. The results showed that the impact of a hydrogen flame in the tunnel depended on the hydrogen release rate. The tunnel ventilation system could eliminate the upstream backlayering and fully control downstream flame with a smaller hydrogen release rate. For a larger hydrogen release, the tunnel ventilation system could not provide sufficient air flow into the fire and there is an oxygen deficit hydrogen layer accumulating under the ceiling downstream of the fire. The accumulating hydrogen layer could pose a more serious hazard inside the tunnel.
Assessment of the impact of jet flame hazard from hydrogen cars in road tunnels
Tramsportation Research, Part C: Emerging Technologies ; 16 , 2 ; 246-254
2007-08-07
9 pages
Article (Journal)
Electronic Resource
English
Assessment of the impact of jet flame hazard from hydrogen cars in road tunnels
Online Contents | 2008
|Preventing hydrogen detonations in road tunnels hydrogen trap concept
Tema Archive | 2014
|Protection for motor cars at tunnels
Engineering Index Backfile | 1956
Hazard Assessment for Pressure Tank Cars Involved in Accidents
British Library Conference Proceedings | 2000
|British Library Conference Proceedings | 1996
|