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《Journal of Shenyang Jianzhu University(Natural Science)》 2011-01
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Study on Fire Suppression Effects by Coupling Water Mist with Smoke Exhaust in a Highway Tunnel

ZHANG Peihong,LI Nan,ZHANG Xinchun,MA Zhongjiao(School of Municipal and Environmental Engineering,Shenyang Jianzhu University,Shenyang,China,110168)  
This paper aims to study fire suppression effects of different heat release rates in highway tunnel by combined smoke exhaust system with water mist,and to discuss the suppression effects of water mist when turned on the smoke exhaust at different time.Based on Fire Dynamics Simulator,the simulations were carried out when the heat release were 4MW and 2.5 MW,respectively.And the smoke exhaust system was turned on at the moment of 60 seconds,120 seconds,and 150 seconds from fire start,respectively.Following parameters are discussed to analyze the heat release rate of pool fire,the average temperature over oil surface,the volume percentage of CO in the air at 1.5 meters height in the tunnel.Results show that when the heat release rate of the fire in the highway tunnel was 4 MW,smoke exhaust system was helpful to extinguish the fire.The suppression effect was the best when the smoke exhaust system and water mist worked at the same time.When the heat release rate was 2.5 MW,the extinguishment time was the shortest when the smoke exhaust system and water mist worked at the same time,the suppression effect was better when turned on the smoke exhaust system at 60 seconds comparing with the situation when smoke exhaust system was turned on at 150 seconds.The simulation results show that though the smoke was well controlled when the smoke exhaust system was turned on,the suppression effect was different if the heat release rate was different in the condition of smoke exhaust system combined with water mist system.The start time of smoke exhaust system should be well controlled with consideration of the different heat release rate.
【Fund】: 住房和城乡建设部研究开发项目(2007-K3-5);; 沈阳市大型科学仪器设备共享服务专项基金项目(2007GX-45)
【CateGory Index】: U458.1
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