隧道坡度对临界风速影响的数值研究

临界风速即隧道火灾过程中能有效控制烟气于火源下风方向而不发生逆流的最小纵向通风风速,是隧道火灾烟气控制的关键所在.根据国内外的研究结果,临界风速与火灾规模、隧道规模以及断面形状等因素有关.在坡度隧道中,由于坡度的作用,使得坡度隧道临界风速与水平隧道有着一定的差别.利用火灾动力学模拟软件(FDS)对隧道坡度在0°～10°变化时上坡隧道与下坡隧道所对应的隧道临界风速进行数值模拟分析,研究分析了隧道坡度对隧道临界风速的影响规律.

Numerical studies on the critical air velocity affected by tunnel slope

The critical air velocity,i.e.the minimum air velocity required to suppress the smoke spreading against the longitudinal ventilation flow during tunnel fire situations,is a key criterion for the tunnel fire smoke control.Available reports indicated that the critical velocity is preliminarily concerned with the fire power,and the tunnel geometry etc.There may be some difference between the critical velocity in a sloping tunnel and that in a horizontal tunnel,due to effect of slope.In this paper,a series of n...