建筑火溢流附壁效应的燃烧-流动耦合作用机制与规律研究

Attachment of fire spill plume is a typical fire behavior in building fires, which may cause intense radiative and convective heat transportation to the exterior building surface, leading to severe damages of building structure. So far there have been only very limited researches on the attachment effect of fire spill plume, due to the complex interactions between flow and combustion. The physical mechanism and behavior of the attached fire spill plume is still far from being fully elucidated. This project will systematically investigate the velocity/entrainment and combustion characteristics of the attached fire spill plume by using comprehensive measurements and theoretical analyses. The interaction mechanism of combustion and flow will be revealed, thereby the key mechanism and critical condition for the attachment effect of fire spill plume are expected to be systematically elucidated. Based on the physical interpretation, the theoretical model for predicting the behaviors of the attachment of fire spill plume will be developed by coupling the interaction mechanism of flow and combustion. Fundamental theory and prediction method for the prevention of fire spill plume and the relevant fire safety design are expected as the outcome of this project.

火溢流附壁（Attachment of fire spill plume）是建筑火灾中一种常见的火行为，它会使外壁面受到剧烈辐射及对流传热，造成建筑结构的严重受热受损。迄今针对火溢流附壁效应的研究工作尚属初步，关键问题是尚未深入认识附壁行为中流动与燃烧的复杂物理耦合作用机制，因此无法完备阐述与描述火溢流附壁的燃烧特性与运动轨迹。本项目利用实验模拟和理论建模，测量和分析附壁火溢流的速度分布、卷吸和燃烧特性，揭示燃烧与流动的相互作用机制，系统阐释火溢流附壁效应的受控机制与临界条件，实现对压差、热浮力及湍流应力项等关键物理量的理论描述，建立耦合流动-燃烧复杂机制的火溢流附壁行为预测模型。项目为火溢流的防控及相关的消防设计提供基础理论与预测方法，具有重要的基础科学意义和应用价值。

火溢流的附壁是建筑火灾中一种常见的现象，它会使建筑外壁面受到剧烈的辐射及对流传热，造成建筑结构的严重受热受损。本项目借助实验模拟和理论建模，系统研究在不同火源功率、位置和长宽比条件下建筑火溢流的形成和燃烧机理，揭示了火溢流的附壁行为的主控物理机制。揭示了室内火源位置对于火溢流的初始流动和燃烧特征的影响机理，阐释了室内火焰形态对于火溢流的影响机制。揭示了火溢流的弯曲机理，构建了火焰轨迹的预测物理模型。揭示了火源长宽比对于矩形火焰的影响机理，发展了耦合火源长宽比影响的矩形火焰燃烧特征的理论模型。呈现了有无外壁面影响下的火溢流二维速度场分布，揭示了附壁效应对于火溢流的流场演化的影响规律。项目可为火溢流的防控及相关的消防设计提供基础理论与预测方法。. 项目总计发表论文4篇。其中在国际燃烧期刊Applications in Energy and Combustion Science（Progress in Energy and Combustion Science的sister journa）发表论文1篇，在国际火灾领域权威期刊Fire Safety Journal发表论文1篇。项目负责人入选了中国科协青年人才托举工程计划。