Analysis on ventilation pressure of fire area in longitudinal ventilation of underground tunnel

2017 International Symposium on Application of Materials Science and Energy Materials

材料科学;能源学

Li, Jiaxin^1 ; Li, Yanfeng^2 ; Feng, Xiao^2 ; Li, Junmei^2

Beijing Key Laboratory of Green Built Environment and Energy Efficient Technology, Beijing University of Technology, Beijing, China^1

College of Architecture and Civil Engineering, Beijing University of Technology, Beijing, China^2

关键词: Cross sectional area;    Design calculations;    Emergency ventilation;    Longitudinal ventilation;    Semi-empirical calculation;    Thermodynamic equilibria;    Underground tunnels;    Ventilation velocity;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/322/5/052020/pdf
DOI  :  10.1088/1757-899X/322/5/052020

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In order to solve the problem of ventilation pressure loss in the fire area under the fire condition, the wind pressure loss model of the fire area is established based on the thermodynamic equilibrium relation. The semi-empirical calculation formula is obtained by using the model experiment and CFD simulation. The validity of the formula is verified. The results show that the ventilation pressure loss in the fire zone is proportional to the convective heat release rate at the critical velocity, which is inversely proportional to the upstream ventilation velocity and the tunnel cross-sectional area. The proposed formula is consistent with the law of the tunnel fire test fitting formula that results are close, in contrast, the advantage lies in a clear theoretical basis and ventilation velocity values. The resistance of road tunnel ventilation system is calculated accurately and reliably, and then an effective emergency ventilation operation program is developed. It is necessary to consider the fire zone ventilation pressure loss. The proposed ventilation pressure loss formula can be used for design calculation after thorough verification.