The Effect of Wind Speed on the Leakage and Diffusion of Hydrogen Transport Vehicles in Urban Highway Tunnels
In order to understand the diffusion law of gas leakage in hydrogen transport vehicles in highway tunnels under dif-ferent wind speeds,the PyroSim software was used to study the distribution law of hydrogen concentration after hydrogen transportation vehicle leakage in urban highway tunnels at different wind speeds. The results show that:under the windless condition,hydrogen clouds rapidly diffuse towards the tunnel openings at both ends due to momentum and buoyancy effects and reaches the explosion limit at the top of the tunnel in 40s,and maintains for a long time;In windy conditions,hydrogen spreads along the downwind of the leakage outlet. With the increase of wind speed,the height of the hydrogen cloud decrea-ses,the concentration of hydrogen at the top of the tunnel decreases rapidly,and the concentration of hydrogen in the middle and lower parts increases first and then decreases. The wind speed of emergency ventilation after the leakage of hydrogen trans-port vehicles in the tunnel should be controlled above 10m/s. The conclusions can provide theoretical guidance for the emergen-cy rescue of hydrogen transport vehicle leakage in highway tunnels and the optimized design of tunnel ventilation system.
hydrogenhighway tunnelshydrogen transport vehiclesleakage and diffusion
NETL
NSTL
万方数据
