海底隧道半横向通风方式模型试验与数值仿真

为了研究半横向通风方式隧道内风速、风压的分布特点,针对某海底隧道半横向通风方案,建立1∶9的缩尺物理模型与1∶1的三维数值仿真模型,研究了排风孔开启数量与排风孔开启位置对隧道内风速、风压分布的影响。研究结果表明:相同排风动力下,随着排风孔开启数量的增加,隧道内排风量增加,但增加幅度逐渐减小;开启事故位置下游2个排风孔,并固定距事故位置最近的第1处排风孔的位置,随着2个排风孔之间距离的增大,第1处排风孔的排风量增加,烟流扩散至第2处排风孔的行程增加,隧道排烟效率降低。

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.