水幕与排烟系统协作下隧道火灾烟气防控研究

Research on smoke prevention and control of tunnel fire under cooperation of water curtain and smoke exhaust system

为优化选择水幕和机械排烟系统作用下最佳防排烟方式,运用FDS数值模拟方法探究排烟速率和水幕与排烟口间距对烟流分布的影响,并对11组模拟工况下排烟效率和烟气特征参数变化规律进行研究。结果表明:20 MW的火源功率下,排烟速率为60 m^3/s、水幕与排烟口间距为12.5 m时,排烟效率较高且烟气特征参数满足安全要求,考虑防排烟的有效性和经济性,可选其为最优防排烟组合方式。研究结果对防排烟系统的设计具有指导意义。

In order to optimally select the optimum smoke prevention and exhaust mode under the action of water curtain and mechanical smoke exhaust system,the FDS numerical simulation method was used to explore the influence of smoke exhaust rate and distance between water curtain and smoke exhaust vent on the distribution of smoke flow.Through the study on the change laws of smoke exhaust efficiency and smoke characteristic parameters under 11 sets of simulated working conditions,the results showed that when the fire source power was 20 MW,the smoke extraction rate was 60 m^3/s and the distance between water curtain and smoke exhaust vent was 12.5 m,the smoke exhaust efficiency was higher and the smoke characteristic parameters could meet the safety requirements,which was selected as the optimum combination mode of smoke prevention and exhaust considering the effectiveness and economy of smoke prevention and exhaust.The research results have guiding significance for the design of smoke prevention and exhaust system.