综合管廊断面和风速对排烟影响的数值模拟研究
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摘要
应用火灾模拟软件PyroSim,对综合管廊电缆舱火灾进行数值模拟,讨论不同断面高宽比和风速对排烟效果的影响。分析得到:排烟过程中,下部区域排烟效率高于上部区域;同一断面下,风速越小排烟效率越低;高宽比对于排烟效率影响较大,风速相同时,高宽比越大,下部排烟效率越高,而上部排烟效率越低,高宽比越小,其整体排烟效率越高。
Using the fire simulation software PyroSim,the numerical simulation of the fire in the cable duct of the utility tunnel was carried out to discuss the influence of the aspect ratio and wind speed of different sxhaust on the smoke exhausting effect. The analysis shows that in the process of smoke exhaustion,the smoke sxhaust efficiency in the lower part is higher than that in the upper area;the smaller the wind speed is,the lower the smoke exhaust efficiency is. The aspect ratio has a great influence on the efficiency of smoke exhaust. When the wind speed is same,the higher aspect ratio corresponding to higher efficiency in lower area and lower efficiency in higher area,and the lower aspect ratio corresponding to higher overall smoke exhaust efficiency.
Using the fire simulation software PyroSim,the numerical simulation of the fire in the cable duct of the utility tunnel was carried out to discuss the influence of the aspect ratio and wind speed of different sxhaust on the smoke exhausting effect. The analysis shows that in the process of smoke exhaustion,the smoke sxhaust efficiency in the lower part is higher than that in the upper area;the smaller the wind speed is,the lower the smoke exhaust efficiency is. The aspect ratio has a great influence on the efficiency of smoke exhaust. When the wind speed is same,the higher aspect ratio corresponding to higher efficiency in lower area and lower efficiency in higher area,and the lower aspect ratio corresponding to higher overall smoke exhaust efficiency.
引文
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[2]杨其新,王明年,曹智明.长大双洞公路隧道火灾模式下横通道风流研究[J].地下空间,2004(2):220-223.
[3]王日升.美菰林纵向通风公路隧道数值模拟与研究[D].北京:北京工业大学,2003.
[4]张玉春,何川,曾艳华,等.特长公路隧道半横向排烟方式研究[J].公路隧道,2009(1):55-58.
[5]赵永昌,朱国庆,高云骥.城市地下综合管廊火灾烟气温度场研究[J].消防科学与技术,2017,36(1):37-40.
[6]彭玉辉.典型电缆火灾条件下烟气运动规律的数值模拟[J].船海工程,2016,45(2):65-68,73.
[7]刘应明.城市地下综合管廊工程规划与管理[M].北京:中国建筑工业出版社,2016:183-185.
[8]郝冠宇.综合管廊中电缆舱内火灾烟气模拟研究[D].西安:西安建筑科技大学,2017.