公路隧道通风系统“沿程压力损失系数”取值研究

对公路隧道通风系统中的沿程压力损失系数取值进行了理论分析和计算模拟。研究结果表明,尼古拉兹经验计算式适用于联络风道和竖井的沿程压力损失系数计算且可满足工程精度要求,但并不适用于运营工况下隧道正洞的沿程压力损失系数计算。在充分考虑高速公路隧道洞内附属设施的情况下,对两车道、三车道以及四车道公路隧道的"等效通风沿程压力损失系数"进行模拟,得出了对应隧道"等效通风沿程压力损失系数"的最小值。在此基础上,考虑隧道内行驶车辆的体积对隧道通风的影响,求出了隧道"等效通风沿程压力损失系数"的最大值。相关研究结论可供公路隧道通风设计计算参考。

Study on Friction Loss Coefficient of Ventilation System for Highway Tunnel

The friction loss coefficient of ventilation system for highway tunnel is theoretically analyzed and simulated by CFD software. It＇s proved that Nikuras formula can apply to the calculation of friction loss coefficient of connecting duct and vertical shaft for ventilation, but cannot apply to those for the main tunnel under operating condition. In consideration of the affection of affiliated facilities in the main tunnel, the equivalent friction loss coefficient which is the minimum of highway tunnel （with two lanes, three lanes and four lanes） is numerically analyzed. And then, in consideration of the affection of vehicle volume, the equivalent friction loss coefficient which is the maximum is also numerically analyzed. The conclusions could be used as references for highway tunnel ventilation design calculation.