Model test and numerical simulation on tunnel semi-transverse ventilation system

In order to study the distribution of wind speed and wind press in the tunnel with semi-transverse ventilation system,considering semi-transverse exhaust ventilation of a certain immersed tunnel,this paper established a reduced scale physical model with 1∶9 ratio of prototype and a three-dimensional numerical simulation model with 1∶1 ratio of prototype,reached the impact of the number of the open ventilation vents and the position of the open ventilation vents on the distribution of wind speed and wind press in the tunnel.The results show that: under the same exhaust power,the exhaust volume increases with the increasing number of the open ventilation vents;opening tow ventilation vents and setting the position of the first ventilation vents,with the increasing of the distance between the tow ventilation vents,the exhaust volume through the first ventilation vents increases but the rout of the smock spreading to the second ventilation vents is added.