【摘要】 针对2种等宽度、不等高度的水平隧道模型,借助CFD技术分析了环境温度、火灾热释放强度、断面形状对临界风速的影响。选择断面水力高度为特征尺寸,获得2种隧道模型对应的量纲一的临界风速随热释放强度的变化关系,且其与缩尺模型试验及全尺度试验结果相比均具有较好的一致性;并基于CFD模拟结果,分析了Kennedy公式的不足。结果表明,大型隧道火灾通风纵向控制风速的确定过程中应避免使用Kennedy公式计算临界风速。更多还原

【Abstract】 Aimed at horizontal tunnel model with the same width and different heights,using CFD technology,influences of environmental temperature,fire heat releasing strength,section shape on critical wind velocity were analyzed.Hydraulic height was selected as characteristic length and variational relation of dimensionless critical wind velocity corresponding to the 2 kinds of tunnel models vs heat releasing strength was gained,which was in a good agreement with the results of reduced-scale and full-scale tunnel fire tests.Based on CFD simulating result,the short-comings of Kennedy formula were analyzed.The result shows that Kennedy formula should be avoided to use in determining fire ventilation longitudinal control wind velocity for long tunnel.更多还原