【摘要】 为解决长大隧道风量分配的问题，以通风机组合应用为切入点，依托青岛地铁8号线大洋站至青岛北站区间隧道，建立数值模型进行仿真计算，通过验证模型试验数据与数值仿真结果，得到隧道内部流场的分布特征，从速度-静压角度对比单抽与双压单抽2种风机组合工况下隧道通风系统的排烟效率与烟雾控制能力.结果表明：与单抽工况相比，双压单抽工况可以调节下游风机的压力大小和控制新鲜风流速度，降低排烟道的沿程阻力；隧道中X轴方向上的压力分布显示吊顶排烟口处存在等压线，双压单抽工况中污染气流从上游蔓延至下游所需要的压升高于单抽工况，而双压单抽工况下行车道下部的横向速度不足0.15 m/s,远低于单抽工况，说明双压单抽工况下的烟雾控制能力更强；在功率一定的情况下，双压单抽工况的有效出风率比单抽工况高20个百分点，因此，双压单抽工况的排烟效率要远高于单抽工况.所得结果验证了双压单抽风机组合应用的科学性，可为现场设计提供参考.更多还原

【Abstract】 To address the airflow distribution in the long tunnel with large section, a combination of ventilation fans is utilized as the starting point. Relying on the tunnel section between Dayang Station and Qingdao North Station on Qingdao Metro Line 8, a numerical model is established to conduct simulation calculations. By cross-validating the experimental data with the numerical simulation results, the distribution characteristics of the flow field inside the tunnel are obtained. From the perspectives of velocity and pressure, a comparison is made between the smoke exhaust efficiency and smoke control capability of the tunnel ventilation system in two fan combination scenarios: the single exhaust fan and the combination of two forced fans with an exhaust fan. The research finds that in the single exhaust fan, excessively high fresh airflow velocity inhibites the ventilation capacity on the polluted side. In the combination of two combination of forced fans with an exhaust fan, the fresh air flow velocity could be controlled by adjusting the pressure of the downstream fan, thereby reducing the resistance along the smoke exhaust duct. The pressure distribution in the X-axis direction within the tunnel reveals the presence of equal pressure line at the ceiling smoke exhaust outlet. In the combination of two forced fans with an exhaust fan, the required pressure rise for the polluted airflow to propagate downstream is higher than that in the single fan. From the perspective of velocity, it can be observed that in the single fan, the transverse velocity at the lower part of the roadway reaches a minimum of around 0.5 m/s, whereas in the combination of two forced fans with an exhaust fan, the transverse velocity is less than 0.15 m/s, indicating a stronger smoke control capability in the dual-pressure single exhaust configuration. Through the comparison of exhaust effectiveness, it has been found that under the same power, the smoke exhaust efficiency in the combination of two forced fans with an exhaust fan is 20 percentage points higher than that in the single fan. The above conclusions have demonstrated the scientific validity of utilizing the combination of two forced fans with an exhaust fan, providing references for on-site design.更多还原