双火源对隧道火灾临界风速影响的数值研究

发布时间：2018-03-13 11:23

本文选题：隧道火灾　切入点：数值模拟　出处：《火灾科学》2017年01期 　论文类型：期刊论文

【摘要】：为研究双火源隧道火灾所需临界风速的变化规律,利用火灾动力学软件FDS模拟了三种双火源隧道火灾,即两等火源功率的火灾、上风流火源功率较大火灾、上风流火源功率较小火灾。根据各火灾情景下所得临界风速u_(cr),分析两火源距离d、火源功率、上下风流位置关系对临界风速u_(cr)的影响规律。结果表明:随着两火源距离d的增加,所需临界风速u_(cr)逐渐减小,当两者达到临界距离d_x时,临界风速u_(cr)为稳定值,该值由两火源上下风流位置关系和总火源功率共同决定;同种双火源火灾随着总火源功率增大,所需的临界风速u_(cr)增大;随着两火源间距离d增大,各双火源火灾所需临界风速u_(cr)的减小幅度不同;两火源距离d为零时,所需临界风速u_(cr)略大于同火源功率的单火源火灾所需的临界风速。
[Abstract]:In order to study the variation rule of critical wind speed required for fire of double fire source tunnel, the fire dynamics software FDS is used to simulate three kinds of fire of double fire source tunnel, that is, the fire of two kinds of fire source power, the fire of upper wind current fire source power is large. According to the critical wind speed of each fire scenario, the influence of the distance d of two fire sources, the power of fire source and the position relationship of upper and lower air flow on the critical wind speed USP crat) is analyzed. The results show that: with the increase of the distance d between two fire sources, The critical wind speed uhhcrs is gradually decreasing. When both reach the critical distance DX, the critical wind speed u / c) is a stable value, which is determined by the relationship between the upper and lower air flow position of the two fire sources and the total fire source power, and the same kind of double fire source fire increases with the total fire source power. The critical wind speed uhcrs required increased; with the increase of the distance d between the two fire sources, the decrease range of critical wind speed usp crs for each double fire source fire was different; the distance between the two fire sources d was 00:00, The required critical wind speed uhcrs is a little larger than the critical wind speed required for a single fire source fire with the same fire source power.
【作者单位】：河南理工大学安全科学与工程学院;重庆大学煤矿灾害动力学与控制国家重点试验室;
【基金】：国家自然科学基金项目(U1361205,51574111) 煤矿灾害动力学与控制国家重点实验室自主研究课题重点项目(2011DA105287-ZD201401)
【分类号】：U458

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