隧道横向偏置火源顶棚温度纵向分布特性研究

为研究隧道横向火源位置对隧道顶棚温度沿纵向分布过程的影响，采用数值模拟与全尺寸模型实验相结合的方法，分析3 种火源功率多种横向偏移位置火源燃烧产生的顶棚温升与对应中心火源工况沿隧道纵向不同位置的温度分布特性。结果表明：对于多种横向偏置火源位置，火源所处纵向的顶棚温升衰减仍可用指数形式描述，越靠近隧道侧壁，温升衰减速度越快。火源与横向中心的偏距和纵向距离的耦合影响对温升衰减规律可以用相对独立的公式形式进行描述。火源功率越大，不同偏距火源下影响温升纵向衰减的范围越小。

Study on the longitudinal ceiling temperature distribution characteristics of tunnel transverse offset fire source

To study the influence of tunnel transverse fire source location on the ceiling temperature distribution along longitudinal process, the method of combining numerical simulation with full-size model experiment is adopted to analyze the ceiling temperature rise generated by the combustion of the three ignition sources at various lateral offset positions and central line ignition sources. The results show that for a variety of transverse offset fire sources, the longitudinal temperature rise attenuation of the fire source can still be described in exponential form, and the closer to the side wall of the tunnel, the faster the temperature rise attenuation is. The coupling effect of the offset distance and longitudinal distance between the ignition source and the transverse center can be described by a relatively independent experienced formula. The larger the power of the ignition source, the smaller the range of the influence of different offset ignition sources on the longitudinal attenuation of temperature rise.