Beijing Key Laboratory of Green Built Environment and Energy Efficient Technology, Beijing University of Technology, Beijing, China.
PLoS One. 2022 Jan 10;17(1):e0262546. doi: 10.1371/journal.pone.0262546. eCollection 2022.
This study simulated a series of bifurcation tunnel fire scenarios using the numerical code to investigate the temperature profile of bifurcation tunnel fire under natural ventilation. The bifurcation tunnel fire scenarios considered three bifurcation angles (30°, 45°, and 60°) and six heat release rates (HRRs) (5, 10, 15, 20, 25, and 30 MW). According to the simulation results, the temperature profile with various HRRs and bifurcation angles was described. Furthermore, the effects of bifurcation angles and HRRs on the maximum temperature under the bifurcation tunnel ceiling and the temperature decay along the longitudinal direction of the branch were investigated. According to the theoretical analysis, two prediction models were proposed. These models can predict a bifurcation tunnel fire's maximum temperature and longitudinal temperature decay in the branch. The results of this study could be valuable for modelling a bifurcation tunnel fire and benefit the fire engineering design of bifurcation tunnels.
本研究使用数值代码模拟了一系列分支隧道火灾场景，以研究自然通风下分支隧道火灾的温度分布。所考虑的分支隧道火灾场景包括三个分支角度（30°、45°和 60°）和六个热释放率（HRR）（5、10、15、20、25 和 30MW）。根据模拟结果，描述了具有各种 HRR 和分支角度的温度分布。此外，还研究了分支角度和 HRR 对分支隧道天花板下最大温度和分支纵向温度衰减的影响。根据理论分析，提出了两个预测模型。这些模型可以预测分支隧道火灾的最大温度和分支的纵向温度衰减。本研究的结果可为分支隧道火灾建模提供参考，并有助于分支隧道的火灾工程设计。
