| The city of Shanghai was divided into Pudong and Puxi by Huangpu River. In order to connect the two sides and resolve the traffic problem, there were tens of cross-river tunnels builded. Dapu Road Tunnel is one of them. Because the the tunnel is long, there should be built a tunnel tower to meet the ventilation requirement. But, the influence of pollutants to surrounding environment should be consided because the wind tower is at urban area.By using the methods of there-dimensional numerical simulation and wind tunnel test, the diffusion rule of pollutants from the new tunnel tower of Dapu Road was analyzed in different atmospheric environment conditions, size of wind tunnel tower and discharge conditions.The numerical simulation model of the dispersion of gaseous pollutants and the atmospheric turbulence around the wind tower were presented. A wind tunnel test of the modeled tower was carried out by using the similarity principle. And the experimental results show good agreement with the numerical simulation. According to the meteorological characteristics of Shanghai, the underlying surface parameters, wind speed profile and turbulent diffusivity were determined. The dispersion of CO and NOx exhausted from the wind tower of Dapu Road was simulated under different characteristics of typical wind speed, directions and exhausted conditions. The characteristics of dispersion distance and influence range are revealed. At last, The influence of emission concentration, discharge velocity, emitting height, wind direction, atmospheric wind velocity and pollutant species on polluting diffusion of road tunnel tower were obtained by analyzing the simulation results. The retardation of buildings around the tower reflects the typical characteristics of diffusion. The simulation results can be used as a reference for wind tower designing. |
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