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Quantitative characterization of crack and cell's morphological evolution in premixed expanding spherical flames

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  • Huang, Sheng
  • Zhang, Yu
  • Huang, Ronghua
  • Xu, Shijie
  • Ma, Yinjie
  • Wang, Zhaowen
  • Zhang, Xinhua

Abstract

Due to absence of quantitative and evolutionary view on flame-front's wrinkling morphonology, descriptions upon instability onset of premixed expanding spherical flames in previous literatures are implicit and inconsistent. This paper utilized shadowgraphy and high-magnification lens in the optical configuration, which clearly manifested cracks in wrinkled flame images and facilitated precise segmentation of them. A simple algorithm was developed to reconstruct real lengths of cracks from these planar projected images. Furthermore, a meaningful parameter, the averaged cell radius, was deducted from the total crack length. Application of this novel methodology on the near-equidiffusive C2H2-air flame reveals similar growth speeds of flame cracks under different pressures before the flame front transits into cellular appearance. Before this transition, the averaged cell radius kept fluctuating around a roughly stable level which was intimately dependent on initial disturbances. Once the transition started, the effect of inherent instability dominates over initial disturbances and averaged cell radii of repeated tests gradually converged to a similar value. The above methodology builds up an automatic way to quantitatively characterizing cracks and cells' developing history, which extracts more useful and precise information from image series than merely manual estimation of cell sizes at individual shoots in previous studies.

Suggested Citation

  • Huang, Sheng & Zhang, Yu & Huang, Ronghua & Xu, Shijie & Ma, Yinjie & Wang, Zhaowen & Zhang, Xinhua, 2019. "Quantitative characterization of crack and cell's morphological evolution in premixed expanding spherical flames," Energy, Elsevier, vol. 171(C), pages 161-169.
    • Handle: RePEc:eee:energy:v:171:y:2019:i:c:p:161-169
    DOI: 10.1016/j.energy.2018.12.202
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    References listed on IDEAS

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    1. Zeng, Wen & Liu, Jing & Ma, Hongan & Liu, Yu & Liu, Aiguo, 2018. "Experimental study on the flame propagation and laminar combustion characteristics of landfill gas," Energy, Elsevier, vol. 158(C), pages 437-448.
    2. Li, Hong-Meng & Li, Guo-Xiu & Jiang, Yan-Huan & Li, Lei & Li, Fu-Sheng, 2018. "Flame stability and propagation characteristics for combustion in air for an equimolar mixture of hydrogen and carbon monoxide in turbulent conditions," Energy, Elsevier, vol. 157(C), pages 76-86.
    3. Choi, Byung Chul & Park, June Sung & Ghoniem, Ahmed F., 2016. "Characteristics of outwardly propagating spherical flames of R134a(C2H2F4)/CH4/O2/N2 mixtures in a constant volume combustion chamber," Energy, Elsevier, vol. 95(C), pages 517-527.
    4. Sun, Zuo-Yu & Li, Guo-Xiu, 2016. "Propagation characteristics of laminar spherical flames within homogeneous hydrogen-air mixtures," Energy, Elsevier, vol. 116(P1), pages 116-127.
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    Cited by:

    1. Xu, Cangsu & Liu, Weinan & Oppong, Francis & Wang, Qianwen & Sun, Zuo-Yu & Li, Xiaolu, 2022. "Investigations on cellularization instability of 2-ethylfuran," Renewable Energy, Elsevier, vol. 191(C), pages 447-458.
    2. Xiaobei Cheng & Xinhua Zhang & Zhaowen Wang & Huimin Wu & Zhaowu Wang & Jyh-Yuan Chen, 2021. "Effect of Microwave Pulses on the Morphology and Development of Spark-Ignited Flame Kernel," Energies, MDPI, vol. 14(19), pages 1-19, September.
    3. Zhao, Haoran & Wang, Jinhua & Cai, Xiao & Dai, Hongchao & Liu, Xiao & Li, Gang & Huang, Zuohua, 2023. "On accelerative propagation of premixed hydrogen/air laminar and turbulent expanding flames," Energy, Elsevier, vol. 283(C).

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