In order to prevent smoke from flowing backward and penetrating into adjacent tunnel through cross channels during evacuation in case of fire accidents in highway tunnels, it is extremely necessary to implement the linkage control scheme for double-hole tunnel ventilation system. Therefore, six linkage control schemes for ventilation system are proposed in this article. Firstly, these six schemes were numerically simulated through Fire Dynamics Simulator (FDS) to obtain the flow velocity, flow direction, and smoke distribution under different schemes when the peak power of fire accidents is 30 MW. And two better schemes were selected for further investigation based on the evacuation conditions in the upper stream of fire source. Secondly, a 1 : 10 scale model experiment was conducted to test these two schemes, and the results from numerical simulation and model experiment were compared and verified. Finally, the location of fire accident, the time to develop stable opposite airflow, and the number of open cross channels were analyzed to confirm the applicability of the recommended scheme. The results show that the optimal scheme is to switch on the fans in the upstream of the fire accident and the fans on both sides of the cross channel in the non-fire tunnel to form positive pressure to control the smoke flow. This scheme ensures a stable and uniform smoke flow in the cross channel and personnel’s safety during evacuation.

中文翻译：

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双孔隧道火灾通风系统联动控制策略研究

在公路隧道发生火灾事故时，为防止烟尘在疏散过程中烟气倒流并通过交叉通道进入相邻隧道，非常有必要实施双孔隧道通风系统的联动控制方案。因此，本文提出了六种通风系统的联动控制方案。首先，通过火灾动力学仿真器（FDS）对这六个方案进行了数值模拟，以求得火灾事故的峰值功率为30兆瓦时不同方案下的流速，流向和烟气分布。根据火源上游的疏散条件，选择了两种更好的方案进行进一步研究。其次，进行了1:10比例模型实验以测试这两种方案，比较了数值模拟和模型实验的结果。最后，分析了火灾事故的发生地点，产生稳定的相反气流的时间以及敞开的交叉通道的数量，以确认推荐方案的适用性。结果表明，最优方案是在火灾事故的上游打开风机，在非火灾通道的横向通道两侧打开风机，形成正压控制烟气流量。该方案确保了在交叉通道中稳定，均匀的烟流，并在疏散期间确保人员安全。并分析了开放交叉通道的数量，以确认推荐方案的适用性。结果表明，最优方案是在火灾事故的上游打开风机，在非火灾通道的横向通道两侧打开风机，形成正压控制烟气流量。该方案确保了在交叉通道中稳定，均匀的烟流，并在疏散期间确保人员安全。并分析了开放交叉通道的数量，以确认推荐方案的适用性。结果表明，最优方案是在火灾事故的上游打开风机，在非火灾通道的横向通道两侧打开风机，形成正压控制烟气流量。该方案可确保在交叉通道中烟流稳定且均匀，并在疏散期间确保人员安全。