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STUDY ON FLAME HEIGHT OF MERGED FLAME FROM MULTIPLE FIRE SOURCES

机译：从多种火源研究融合火焰的火焰高度

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A series of experiments to study merged flame from multiple fire sources was carried out. The porous 15-cm~2 burner was used as a unit burner and propane was employed as a fuel. Many burners with various heat release rates were placed in a square configuration with various separation distances. Flame height was measured using video images and temperature distribution with height was measured using thermocouples. The numerical results from the Fire Dynamics Simulator (FDS) of the National Institute of Standards and Technology was compared with the experimental data, and the comparison results show that FDS correctly simulates the merged flame from multiple fire sources. In addition, an empirical model to estimate the merged flame height was developed considering the effect of separation distance. The validity of this model was confirmed from the comparison with the simulation results, and excellent agreement is found between the calculated merged flame height from the model and the numerical ones. To study the detailed structure of merged flame, 3 x 3 fire source configuration was taken as an example to quantitatively show oxygen mass fraction profiles and velocity fields, which were also given to indicate the formation mechanism of the merged flame.
机译：为了研究来自多个火源的融合火焰，进行了一系列实验。多孔15-cm〜2燃烧器用作单元燃烧器，丙烷用作燃料。许多具有各种放热率的燃烧器被放置在具有不同分隔距离的正方形结构中。使用视频图像测量火焰高度，并使用热电偶测量高度的温度分布。将美国国家标准技术研究院火灾动态模拟器（FDS）的数值结果与实验数据进行了比较，比较结果表明FDS可以正确模拟来自多个火源的合并火焰。此外，考虑到分离距离的影响，建立了估计合并火焰高度的经验模型。通过与仿真结果的比较证实了该模型的有效性，并且从该模型计算出的合并火焰高度与数值结果之间找到了极好的一致性。为了研究合并火焰的详细结构，以3×3火源的构型为例，定量显示了氧质量分数分布图和速度场，并指出了合并火焰的形成机理。

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