坡度隧道中烟气控制的CFD模拟研究

CFD Simulation of Smoke Control in Sloping Tunnels

临界风速是隧道火灾紧急通风系统设计的一个重要参数。在坡度隧道中,由于火风压的作用,临界风速与水平隧道临界风速相比会有一定的差异。下坡隧道临界风速会稍大于水平隧道的临界风速。本文对坡度在0～10%范围变化的隧道进行了大量的CFD模拟计算,从模拟结果中得到了临界风速的通用坡度修正公式。

The critical wind velocity in the event of a tunnel fire is an important parameter of the design of emergency ventilation systems.The critical wind velocity in sloping tunnels will be different from horizontal tunnels due to the stack effect.For tunnels with a downhill slope the critical wind velocity is somewhat greater than for the corresponding horizontal tunnel.The simulation results from the study involving tunnels with slopes between 0 and 10 percentage are presented in this paper.A general slope correction factor is derived from these results.