Numerical Simulation of Effects of Ventilation and Vehicle Speeds on CO Distribution in Tunnel

Jiupeng Zhang, Jun Cai, Hao Wang, Peifeng Luo


In this paper, 2D models were established for the tunnel horizontal section to simulate the CO distribution in tunnel, and the effect of ventilation and vehicle speeds on CO distribution were analyzed. Results show that both ventilation speed and vehicle speed affect CO distribution in the tunnel. CO mostly distributes in the central area located 20m behind the last vehicle, and CO concentration in this area increases with the increasing ventilation speed but decreases with the increasing vehicle speed. In the side areas of tunnel, CO concentrations are far lower than in the central area, and decrease with the increasing ventilation speeds and vehicle speeds.


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