隧道火灾烟气回流与临界风速模型试验

摘要

Research situation together with standards and prernscriptions of longitudinal ventilation critical wind speed for dernpressing the tunnel fire smoke back flow were concluded. FDS rnand small scale model experiments were compared to analyze rnthe relationship of critical wind speed and tunnel slope. Results rnshowed that the results of FDS and experiments were mostly rnthe same; when the slope was the same, the longitudinal ventirnlation speed was linearly related with return length; when the rnslope was 0, critical wind speed needed to depress the smoke rnback flow should be bigger.%总结国内外隧道火灾纵向通风排烟下抑制烟气回流临界风速的研究现状和规范规定.通过FDS数值模拟和缩尺寸模型试验对临界风速与隧道坡度的关系进行对比分析,得出结果认为,数值模拟和模型试验结果基本符合;在同一个坡度下,纵向通风速率与回流长度近似成线性关系;当坡度为零时,抑制烟气回流所需临界风速较大.