Flame Spread over Liquid Fuel on a Water Layer-Basic Research on Tsunami Fire
Flame Spread over Liquid Fuel on a Water Layer-Basic Research on Tsunami Fire
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DOI：
10.4236/ojsst.2017.71002
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发表时间：
2017-02
期刊：
影响因子：
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通讯作者：
Shingo Kuwana;Hidekazu Tamizu;A. Ito;H. Torikai
中科院分区：
文献类型：
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作者：
Shingo Kuwana;Hidekazu Tamizu;A. Ito;H. Torikai
本研究的目的是揭示海啸火灾的火焰蔓延机制。但是海啸火灾的机制非常复杂，我们无法进行定性评估。因此需要对海啸火灾进行基础研究。作为第一步，我们仅对液态燃料以及静态液态燃料下的液态燃料/水层进行了火焰蔓延实验。我们测量了火焰蔓延速度。结果表明，燃料厚度在5 - 15毫米范围内，在相同燃料厚度下，仅液态燃料的火焰蔓延速度比液态燃料/水层的更快。为了揭示在相同液态燃料厚度下火焰蔓延速度的差异，我们通过粒子图像测速技术（PIV）对水流分布进行了可视化，并通过阴影法对热边界层进行了可视化。通过这些结果，我们发现液态燃料/水的热特征长度更长，且液态燃料/水的水流特征深度比仅液态燃料的更深。
The purpose of this study is to reveal the flame spreading mechanism of tsunami fire. But the mechanism of tsunami fire is so complex that we couldn’t assess qualitatively. So the basic research on tsunami fire is needed. As a first step, we did flame spread experiment on only liquid fuel and liquid fuel/water layer under static liquid fuel. We measured flame spread rate. As a result, fuel thickness is in range of 5 - 15 mm, and flame spread rate over only liquid fuel is faster than liquid fuel/water layer’s at same fuel thickness. To reveal the gap of the flame spread rate at same liquid fuel thickness, we visualized current distribution by PIV and thermal boundary layer by shadowgraph method. By these results, we revealed that the thermal characteristic length is longer and the current characteristic depth of liquid fuel/water is deeper than that of liquid only fuel.