The 20th and 21st joint COTA International Conference of Transportation Professionals (CICTP 2020-21)

In order to reduce the cost of highway tunnel ventilation and realize the energy saving of tunnel operation, the utilization of natural wind is the direction of tunnel ventilation development. However, due to the randomness of natural wind direction and the uncertainty of air volume, the effective utilization rate of natural wind in tunnel is low. In order to enhance the effect of the natural ventilation of the shaft and control the natural wind direction of the shaft to realize the energy saving of the tunnel ventilation, a three-stage natural wind enhancement model of the shaft-collection shed- chimney is designed. By using the numerical simulation method, the temperature, pressure and wind speed distribution in different positions of the solar chimney under different temperatures are analyzed. So as to determine the natural wind direction. The results show that under the different temperature of the solar chimney, the ventilation capacity of the three-stage solar chimney is linearly related to the temperature difference between the collector and the chimney. And the higher the ambient temperature is, the stronger the linear correlation is. When the ambient temperature is lower than 15 ℃, the wind direction of the solar chimney keeps upward and plays the role of suction. According to the design idea of the model, the solar chimney natural wind ventilation system has been built in No.1 Tunnel of leijiapo, Shaanxi Province. The observation data show that the ventilation system can supplement the mechanical dynamic ventilation of the tunnel. This provides reference for the natural wind utilization of highway tunnels in the Loess Plateau and similar terrain areas.

CICTP