公路隧道中控制火灾烟流的计算模型

Computation Model for Controlling Smoke Plume of Fire in Expressway Tunnel

本模型揭示公路隧道火灾期间发生逆流时火源区域烟流流动规律,得出公式可用于估算阻止火灾期间发生逆流时所需的"临界风速"。从本模型得知临界风速取决于隧道高度和火源热释放率的大小。通过与原型试验隧道火灾试验数据进行比较,本模型可以为防灾通风设计提供依据。

This model reveals the flow rule of smoke plumes within the fire source as reverse flow happens during the fire in expressway tunnel, the formulas obtained accordingly can be used for evaluating the ＂critical wind speed＂ required for preventing reverse flow during the fire. From this model it is known that the critical wind speed depends on the height of tunnel and the release rate of fire source. By comparing with the test data from prototype test tunnel fire, this model can provide the basis for ventilation design against fire.