公路隧道侧向排烟开口分布对烟气蔓延影响的数值模拟研究

The Numerical Simulation on the Effect of the Smoke Exhaust Vent Arrangement on the Smoke Spreading Result in the Tunnel

通过建立三维仿真模型,研究半横向排烟隧道在火灾发生时,排烟开口在火源上下游不同的分布模式对烟气蔓延效果的影响。通过分析模拟结果可知:随着火源上游排烟开口逐步增加,火源上游烟气逆流长度和蔓延速度均逐步增大,烟气沉降到危险高度2 m以下的范围也有所增长;火源下游的烟气蔓延速度则有所下降但是最终蔓延长度变化不大,下游烟气沉降高度则有所升高。该结论将有助于相关隧道工程消防安全设施的设计和日常运行管理。

A 3D simulation model was built in this paper to investigate the effect of smoke vent arrangements on the smoke spreading result in the tunnel with a semi- horizontal smoke extraction mode. Based on the result,it is found that the reverse flow moves faster and the downstream smoke slower with the increasing number of vents in an upstream of the fire source. Furthermore,the upstream reverse smoke flow distance spreads longer and the downstream smoke flow distance has limited changes. The result of the study provides a basis for the smoke control in the tunnel.