In this paper, the influence of sidewall restriction on the temperature distribution beneath the channel ceiling induced by double fires was experimentally and numerically investigated. Two fire scenarios (center and wall fires) were defined and analyzed. Heat release rate (HRR) and fire separation distance (S) were taken as the primary analysis variables. The results show that with the increase in fire separation distance, the temperature distribution beneath the channel ceiling transitions from a “single-hump” shape to an “M” shape, and the “M” shape temperature distribution appears relatively late for the wall fires. The maximum temperature rise beneath the channel ceiling decreases with increasing S/D, and it is larger under the same HRR and S/D for the wall fires. The temperature decay coefficient K decreases with S/D and increases with HRR, and the temperature decay rate of the wall fire is greater than that of the center fire. Finally, prediction models of the maximum temperature rise and longitudinal temperature decay are proposed for the center and wall fires, respectively. This study is anticipated to contribute novel insights to the design of ceiling fire-resistant materials and fire smoke control in channel-like spaces.

中文翻译：

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槽内双火对槽内双火引起的天花板温度分布的影响：实验和数值研究


本文通过实验和数值研究了侧壁限制对双火诱导的通道顶部下温度分布的影响。定义并分析了两种火灾情景（中心火灾和墙壁火灾）。以热释放速率 （HRR） 和防火分离距离 （S） 为主要分析变量。结果表明：随着防火间隔距离的增加，通道顶部下的温度分布由“单驼峰”形状转变为“M”形，且“M”形温度分布对墙体火灾来说出现得相对较晚。通道顶部以下的最大温升随 S/D 的增加而减小，在相同的 HRR 和 S/D 下，墙火的最大温升更大。温度衰减系数 K 随 S/D 减小，随 HRR 增大，墙火的温度衰减速率大于中心火。最后，分别提出了中心火和墙火的最大温升和纵向温度衰减预测模型。本研究有望为吊顶防火材料的设计和通道状空间的火灾烟雾控制提供新的见解。