钟委, 王涛, 梁天水. 隧道火灾中正庚烷池火燃烧特性的实验研究[J]. 工程力学, 2017, 34(8): 241-248. DOI: 10.6052/j.issn.1000-4750.2016.03.0208
引用本文: 钟委, 王涛, 梁天水. 隧道火灾中正庚烷池火燃烧特性的实验研究[J]. 工程力学, 2017, 34(8): 241-248. DOI: 10.6052/j.issn.1000-4750.2016.03.0208
ZHONG Wei, WANG Tao, LIANG Tian-shui. EXPERIMENTAL INVESTIGATION ON THE BURNING CHARACTERISTIC OF N-HEPTANES POOL FIRE IN TUNNEL[J]. Engineering Mechanics, 2017, 34(8): 241-248. DOI: 10.6052/j.issn.1000-4750.2016.03.0208
Citation: ZHONG Wei, WANG Tao, LIANG Tian-shui. EXPERIMENTAL INVESTIGATION ON THE BURNING CHARACTERISTIC OF N-HEPTANES POOL FIRE IN TUNNEL[J]. Engineering Mechanics, 2017, 34(8): 241-248. DOI: 10.6052/j.issn.1000-4750.2016.03.0208

隧道火灾中正庚烷池火燃烧特性的实验研究

EXPERIMENTAL INVESTIGATION ON THE BURNING CHARACTERISTIC OF N-HEPTANES POOL FIRE IN TUNNEL

  • 摘要: 隧道火灾中热释放速率是评估临界风速、最高温度及温度分布的一个重要参数,而火源高度和隧道宽度是两个影响热释放速率的重要因素。为揭示上述两个因素对隧道火灾发展的影响,在缩放比例为1:10的隧道模型中进行了一系列小尺寸火灾模拟实验并对正庚烷池火的燃烧过程进行了研究。结果表明:隧道火灾的热释放速率明显大于开放环境,其燃烧过程可分为初始燃烧阶段、过渡阶段和稳定燃烧阶段;增加火源高度地面火灾(火源高度与隧道高度之比H*=0.1)质量燃烧速率小于其他各工况,H*=0.7时质量燃烧速率能增大到地面火灾的3.53倍~5倍;无量纲火焰蔓延总长度正比于无量纲热释放速率的五分之二次方,由于隧道侧壁的限制作用,其比例系数小于Hasemi's模型。

     

    Abstract: In the case of a tunnel fire, heat release rate is an important parameter for evaluating the critical velocity, the maximum temperature and the temperature distribution. In a tunnel, fire source height and tunnel width are two key factors which affect the growth of the heat release rate. To evaluate the influence of the two factors on fire growth, a series of tests were conducted in a 1:10 scale tunnel, and the burning process of pool fire was studied. Results show that the burning rate of tunnel fire is significantly larger than the one in open space, and tunnel fire can be divided to three stages:initial stage, transition stage and stable burning stage. When changing the fire source height, the mass burning rate of ground fire (the ration of fire source height to tunnel height, H*=0.1) was far less than other situations. For a fire of H*=0.7, the mass burning rate became 3.53~5 times as big as that of the ground fire. The dimensionless total flame extension length is proportional to 2/5 power of dimensionless heat release rate, and the coefficient is less than Hasemi's model due to the restriction of tunnel wall.

     

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