风管出口位置对隧道施工通风效果影响的研究

为研究风管出口位置对公路隧道施工通风效果的影响,利用流体力学软件Fluent,建立隧道三维模型并进行了数值模拟。通过分别对风管管口与工作面5种布设距离及4种布设形式下流场特性的对比,分析了管口与工作面距离及风管附壁程度对流速变化和有效射程的影响。并进一步探讨了风管出口不同位置对局部风阻压力的影响。模拟结果表明:在相同的入口速度条件下,风管附壁程度越高、距离工作面越近,射流速度变化梯度越大,通风效果越明显;风管管口离工作面越近引起的局部压力损失越大。

Numerical Simulation of the Effect of Outlet Position of Air Duct on the Construction Ventilation of the Tunnel

To study the impact of the outlet position of air duct on construction ventilation of highway tunnel, a three-dimensional model of the tunnel is built and simulated numerically with the software Fluent based on fluid dynamics theory. A comparative analysis is made on five kinds of distance between the air duct outlet and heading face and also four kinds of location of air duct, the impact of distance between the air duct outlet and heading face and the attachment of the duct on the flow velocity and effective distance is analyzed. The impact on local resistant wind pressure for different position of the air duct outlet was further explored. The simulation results show that under the same entry speed conditions, the closer the duct was placed to the heading face or attached to the wall of tunnel, the bigger velocity gradient of jet and the better ventilation effects there would be; The value of local pressure loss is bigger when the distance between the air duct outlet and heading face is shorter.