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阻塞比对地铁隧道烟气流速及温度分布的影响分析 预览

Analysis on the influence of blocking ratio on smoke flow speed and temperature distribution of subway tunnel
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摘要 采用FDS模拟技术研究地铁隧道截面阻塞比和隧道截面形状对临界通风速率、临界通风下顶棚最高温度分布及列车周围温度分布的影响。结果表明:阻塞比增加,圆形截面隧道的烟气流速增大,矩形隧道的先增大后减小,且圆形的大于矩形;阻塞比增加,临界通风速率减小,且当阻塞比相同时,圆形截面的临界通风速率大于矩形截面;在临界通风速率下,阻塞比对隧道顶棚温度的影响主要集中于列车着火位置上部,且随着阻塞比的增加,隧道顶棚最高温度升高。 The FDS was used to study the effect of cross-sectional shape and blocking ratio of the subway lunnel on critical velocity, the highest temperature distribution on the ceiling under the critical velocity, as well as the temperature distribution around the train. The results showed that, with the in crease of the blocking ratio, the smoke flow speed in crease in the tunnel with circular cross sec tion, and first in crease then decrease in rectangle lunn el, and thespeed in circular lunnel is bigger than thal in rectangle lunnel;the critical velocity decreases as the blocki ng ratio in creases, and the critical velocity of the circular cross section tunnel is greater than the rectangular cross section lunnel as lhe blocking ratio is the same;at the critical velocity, the effect of the blocking ratio on the roof temperature is mainly conccntrated in the upper of lhe train, and as the blocking ratio increases, the maximum temperature of lhe lunnel ceili ng in creases.
作者 赵小龙 陈长坤 陈杰 康朋飞 ZHAO Xiao-long;CHEN Chang-kun;CHEN Jie;KANG Peng-fei(Institute of Disaster Prevenlion Science & Safety Technology ,Central South University, Hunan Changsha 410075, China)
出处 《消防科学与技术》 CAS 北大核心 2019年第2期177-180,共4页 Fire Science and Technology
基金 国家重点研发计划项目(2016YFC0802500) 国家自然科学基金面上项目(51576212).
关键词 地铁隧道 截面形状 阻塞比 隧道火灾 临界风速 温度分布 melro tunnel cross-sectional shape blocking ratio tunnel fires critical velocity temperature distribution
作者简介 赵小龙(1990-),男,甘肃陇西人,中南大学土木工程学院消防工程系博士研究生,主要从事隧道火灾、髙性能阻燃材料等方面的研究,湖南省长沙市天心区韶山南路22号.
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