Theoretical research on crossflow pollution in short distance and continuous road tunnels

In the researches on tunnel ventilation in domestic and abroad, the crossflow problems of polluted air between short distance and continuous tunnels are mostly ignored. When the ventilation system is designed, special treatments about crossflow are usually not done. Therefore, the further theoretical research on crossflow problems is particularly urgent and necessary. Based on this, firstly, the short distance and continuous tunnel ventilation system is simulated by numerical simulation software Fluent and the new concept is proposed, i.e. crossflow ratio. Secondly, the simulated results are analyzed, the rules are revealed and the crossflow ratio formula is fitted by software Origin 8.0. Finally, check criteria in the continuous tunnel ventilation design and theoretical measures of preventing crossflow pollution are proposed. The crossflow ratio and check criteria provide theory evidence for short distance and continuous tunnel ventilation design in the tunnel group.