Numerical Analysis of Smoke Flow in Tunnel Fire with Single Curvature

In this paper, the numerical simulation of the curved highway tunnel model is carried out by using ANSYS FLUENT software, and the smoke propagation law of the longitudinal axis and cross section under the influence of different fire source power, curvature and ventilation wind speed are deeply analyzed, the trend of smoke temperature and CO concentration along the vault and human high area was discussed in detail. The results show that the smoke temperature and CO concentration in the vault and 2 m height of the tunnel increase with the increase of power, but when the ventilation wind speed is 2 m/s, the CO concentration in the downstream vault decreases with the increase of power, when the ventilation wind speed is greater than 3m/s, the temperature and CO concentration of the downstream vault decrease with the increase of curvature, while for the height of 2 m, the smoke temperature and CO concentration of the downstream increase with the increase of curvature. This law is opposite to the ventilation wind speed of 2 m/s, as the ventilation wind speed increases, the smoke temperature and CO concentration is lower; the lateral concentration of the curved highway tunnel no longer presents a symmetric distribution, and the concentration in the upper right corner of the cross section is slightly larger than the lower left corner.