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首页> 外文期刊>Tunnelling and underground space technology >Experimental study on the characteristics of temperature distribution of two pool fires with different transverse locations in a naturally ventilated tunnel
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Experimental study on the characteristics of temperature distribution of two pool fires with different transverse locations in a naturally ventilated tunnel

机译：不同横向位置在自然通风隧道中的两个池火灾温度分布特性的实验研究

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The interaction between multiple fires is complex, in which the theory of single fire is not applicable. This study focuses on the combustion characteristics and temperature distribution of two pool fires with different transverse locations in a model tunnel under natural ventilation. In this study, 84 groups of combustion experiments of two ethanol pool fires were designed by varying the spacing between two pool fires (denoted by S), transverse distance between the geometric center of pool fires and tunnel sidewall (L), and side length of oil pan (D). The experimental results show that when L = 50 cm and L = D/2, mass loss rate decreases along with a bigger S/D, and reaches the minimum for L = 50 cm and the maximum for L = D/2. However, mass loss rate first increases and then decreases with S/D for L = 30 cm and L = 20 cm, which is controlled by the competition between air entrainment and radiant heat feedback. In order to describe the influences of fire source spacing and transverse distance, a prediction model of maximum temperature rise under the tunnel ceiling is developed, which matches the experimental results well. Under the case of no flame merging, longitudinal temperature distribution is insensitive to the transverse location rather than the spacing between the fire sources. Moreover, it is found that the vertical temperature distribution far from the fire sources matches the Gaussian distribution well. The results of this work can provide a significant reference for the risk assessment of tunnel fires with two fire sources.
机译：多次火灾之间的相互作用是复杂的，其中单火理论不适用。本研究侧重于在自然通风下模型隧道中不同横向位置的两个池火灾的燃烧特性和温度分布。在这项研究中，通过改变两个池火（由S）之间的间距，池侧面（L）的几何中心之间的横向距离和隧道侧壁（L）之间的间距，以及隧道侧壁（L）之间的横向距离和隧道侧壁（L）之间的横向距离，设计了84组乙醇池燃烧的燃烧实验。油锅（D）。实验结果表明，当L = 50cm和L = D / 2时，质量损失率随更大的S / D而降低，并且达到L = 50cm的最小值，L = D / 2的最大值。然而，质量损失率首先增加，然后用S / D降低L = 30cm，L = 20cm，由空气夹带和辐射热反馈之间的竞争控制。为了描述消防源间距和横向距离的影响，开发了隧道天花板下的最高温度升高的预测模型，符合实验结果良好。在没有火焰合并的情况下，纵向温度分布对横向位置不敏感而不是火源之间的间隔。此外，发现远离消防源的垂直温度分布良好地匹配高斯分布。这项工作的结果可以为隧道火灾的风险评估提供重要的参考，有两个火源。

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