半横向排烟下公路隧道火灾烟气逆流长度规律研究

为研究不同因素对半横向排烟模式下公路隧道火灾烟气逆流长度的影响规律,采用理论分析推导火灾烟气逆流长度与火源功率、排烟速度、排烟口面积和排烟口间距4个因素的无量纲关系式,运用数值模拟研究不同因素下火灾烟气的运动规律,最后拟合得到烟气逆流长度的无量纲关系式.结果表明:在半横向排烟模式下,烟气逆流长度随火源功率的增大而增大,...

Study on smoke back-layering length in highway tunnel fire under semi-transverse smoke exhaust

In order to study the influence of different factors on the smoke back-layering length in the highway tunnel fire under the semi-transverse smoke exhaust mode,the dimensionless relational expressions between the fire smoke back layering length and four factors including the fire source power,smoke exhaust speed,smoke vent area and smoke vent spacing were deduced through the theoretical analysis.The movement laws of fire smoke under different factors were studied by numerical simulation,and finally the dimensionless relational expression of smoke back layering length was obtained by fitting.The results showed that under the semi transverse smoke exhaust mode,the smoke back layering length increased with the increase of fire source power,presenting a positive correlation,while it decreased with the increase of smoke exhaust speed,smoke vent area and smoke vent spacing,presenting a negative correlation.The results of numerical simulation are fitted to obtain the corresponding dimensionless relationship of flue gas countercurrent length.The research results are helpful to understand the smoke flow laws and control principles under the semi-transverse smoke exhaust mode.