交通风作用下的隧道运营通风研究

Study on the Traffic Wind Effect for the Ventilation of Highway Tunnel Operation

公路隧道中,车队行驶产生的交通风可以作为对机械风的补充,对隧道运营期通风节能有重要意义。为了分析交通风对隧道通风的影响,本论文依托太湖水下隧道,建立了1 000 m长度的等比例横截面模型,并对模型进行了独立性验证和有效性验证。基于计算流体力学(CFD)原理,采用动网格技术对不同车型比例构成的车队在隧道行驶产生的交通风进行了数值模拟。结果表明,车队经过检测断面时,产生的交通风速呈现周期性变化,表现为先上升,后下降,最后再回升。当车速为85 km/h,中型车和大型车总占比为50%时,车队平均风速最高可达到2.0 m/s。

In highway tunnels,the traffic wind generated by the traffic flow can be used as a kind of supplement to the mechanical wind. Traffic wind is important to ventilation and energy saving in the tunnel operation.In order to analyze the influence of traffic wind on tunnel ventilation,basing on the Taihu Lake underwater tunnel,a1 000-meter-long equal cross section model was set up,and the model was verified for independence and effectiveness.Using the computational fluid dynamics(CFD),the traffic wind generated by the traffic flow was numerically simulated in the tunnel. Dynamic grid technology with the different vehicles’ type proportion was adopted. The results show that when the traffic flow passes through the inspection section,the traffic wind speed shows a periodicity law of rises first,then falls,and rises again. When the traffic flow speed is 85 km/h,and the total proportion of medium and large vehicles is 50%,the average wind speed of the traffic flow can reach 2.0 m/s.