纵向通风对长大隧道火灾烟流控制分析

Three-dimensional simulation analysis of smoke flow controlled by longitudinal ventilation in long tunnel fire

基于我国在长大隧道火灾安全体系研究方面的需要,采用CFD方法对长大隧道纵向式通风控制火灾烟流的问题进行了数值模拟计算,研究不同通风条件对烟流的控制效果,得出了在满足控制烟气回流的基础上排烟风速的提高与所取得的降温效果对比,以及风流经过火区后的蔓延增长变化,同时总结出烟流温度分布特征及对隧道结构不同部位的危害,可为隧道的防火与通风方案的制定,以及灾后检测评定工作提供相关的理论依据和参考。

To meet the need of research on fire safety system for the long highway tunnels,the numerical simulation study of the longitudinal ventilation control on fire smoke flow in the long highway tunnel was presented in this paper.Based on the calculated result,the different effects on smoke temperature under various ventilation controls were compared.The velocity change of the airflow passing through fire zone was also analyzed.From the analysis,the distribution characters and development of smoke in tunnel fire were generalized,which may provide the reference background for fire prevention design.