火灾时公路隧道排烟方案设计与优选

针对双车道单向行驶高速公路隧道火灾提出三种排烟方案.利用FDS软件数值模拟火灾时各方案对烟气迁移和温度分布的影响,最后优选火灾时的排烟方案.结果表明：三种方案均能起到很好的排烟效果.若不考虑成本及技术难度,组合排烟方式效果最佳;若考虑成本和技术难度,则设置排烟口排烟效果最佳.在实际隧道发生火灾时,应综合考虑决定选取哪一种方案.若选用组合排烟方式,笔者建议火灾时,火源上游仅开启射流风机,火源下游则应同时开启排烟口,这样既节约成本,又能达到目的.

On a Smoke Exhaust Program Design and Optimization in a Highway Tunnel on Fire

This paper offers three exhaust programs to a two -lane and unidirectional highway tunnel, examine the effects of the programs on the smoke movement and the temperature distribution. Finally it chooses the optimal ex- haust program. Studies show that： All of the three exhaust programs can achieve the goal of exhausting smoke. Not considering the costs and technical difficulties, the combined exhaustion program is favorable; Considering them, the program of setting smoke vents is prior. In an actual tunnel fire, it should be generally considered to decide which one to choose. For the choice of the combined exhaust program, here is a suggestion that it is a choice to open only jet fans in the upstream of the fire source and both to open jet fans and smoke vents in the downstream when a fireOccurs.