Characterization of n-heptane annular pool fires based on flame shape and texture features

LI Cong; MA Xun; YANG Rui; ZHANG Hui

doi:10.16511/j.cnki.qhdxxb.2020.22.042

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Journal of Tsinghua University(Science and Technology) ›› 2021, Vol. 61 ›› Issue (6) : 502-508. DOI: 10.16511/j.cnki.qhdxxb.2020.22.042

DISASTER PREVENTION AND MITIGATION

Characterization of n-heptane annular pool fires based on flame shape and texture features

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Abstract

The key characteristics of various size n-heptane annular pool fires were experimentally analyzed in this study. The experiments controlled the inner and outer diameters of the annular pool fires. The annular fire flame structures were then analyzed with measurements of the shape and texture features of the flame images. The results show that the flame generates from the outer edge of the annular pool and spreads toward the center. A hollow area develops inside the flame with this area growing as the ratio of the inner to outer diameters increases. For a constant outer diameter, the flame area, perimeter, contrast, entropy, and correlation all decrease with increasing diameter ratio, while the energy increases. A principal component analysis shows that the first two principal components related to the ratio of the inner to outer diameters have high contribution rates larger than 95%, so they can be used to quantify annular flames.

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fire and explosion protection / pool fire / shape feature / texture feature / flame structure

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LI Cong, MA Xun, YANG Rui, ZHANG Hui. Characterization of n-heptane annular pool fires based on flame shape and texture features[J]. Journal of Tsinghua University(Science and Technology). 2021, 61(6): 502-508 https://doi.org/10.16511/j.cnki.qhdxxb.2020.22.042

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