区间隧道内移动火源燃烧特性及反演算法研究

It is necessary for making an effective emergency plan in a tunnel fire to determine the location, intensity and velocity of the fire source. Study on combustion behaviors of a moving fire source and inversion model of fire source would be developed including two aspects: combustion behaviors and fire source parameter inversion.. The coupling effect of the turbulence and combustion on diffusion flame structure would be focused on. Through the simplification of the flow field, the flamelet structure of the moving fire source would be figured out through the experiments and simulation cases. Some full-scale tunnel fire tests wold be developed. Using experimental data come from the full-scale tunnel fire tests, moving fire source combustion models , as fire spreading model , flame horizontal length model, vertical temperature distribution model and the ceiling temperature model,would be developed.. According to the combustion behavior of a moving fire source, inversion algorithm for fire location, intensity and velocity will be developed using the measured data of ceiling temperature. Sequential function specification method (SFSM) was applied to the inverse problem for estimating surface heat flux of the transient inverse heat conduction system by utilizing measured temperature data in the future time steps. Accuracy of inverse solutions will be discussed based on the optimization of future time steps though residual principle. Achievements of research are to provide technical support of the improvement of emergency plan by the judgment “whether is the fire in the train”.

在火源运动和燃烧湍流的影响下，火焰结构变得更加复杂。本项目拟通过对流场进行简化，解析移动火焰面结构，结合小比例狭长空间燃烧实验和全尺寸隧道火灾实验，发展区间隧道内移动火源的蔓延速度，发展速率，烟气温度分布等燃烧模型，实现对狭长空间移动火源扩散火焰结构内在机理和宏观表现的深入剖析。并在此正向规律的基础上，采用顺序函数法，建立火源速度、位置和强度的多元参数反演模型，实现基于隧道顶棚烟气温度信息的移动火源反演算法，研究成果可对火源速度、位置和强度进行反求，为区间隧道火灾应急处置提供火源位置，速度等参考信息，避免由于决策失误造成的重大伤亡。

在火源运动和燃烧湍流的影响下，火焰结构变得更加复杂。本项目通过对流场进行简化，解析移动火焰面结构，结合小比例狭长空间燃烧实验和全尺寸隧道火灾实验，发展区间隧道内移动火源的蔓延速度，发展速率，烟气温度分布等燃烧模型，实现对狭长空间移动火源扩散火焰结构内在机理和宏观表现的深入剖析。并在此正向规律的基础上，采用顺序函数法，建立火源速度、位置和强度的多元参数反演模型，实现基于隧道顶棚烟气温度信息的移动火源反演算法，研究成果可对火源速度、位置和强度进行反求，为区间隧道火灾应急处置提供火源位置，速度等参考信息，避免由于决策失误造成的重大伤亡。