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On the mechanisms of flame propagation in methane-air mixtures with concentration gradient

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  • Sun, Xuxu
  • Lu, Shouxiang

Abstract

In this study, the tulip flame in methane-air mixtures with concentration gradient are investigated experimentally in a square tube with 3-m long and 30 × 30 cm cross section. The concentration gradient is produced by installing 54 (27 × 2) evenly spaced intake gas device on the top wall. Six pressure transducers are used to record the pressure evolution and the high-speed camera is adopted to obtain the flame image. The results indicate that three flame propagation modes are observed, i.e., spherical, curved and tulip. Various concentration gradients can be achieved by changing the ignition delay time (Td) and the methane concentration (CCH4) in the tube. At Td = 10min, asymmetric double tulip flame is seen firstly. As the flame moves forward, the flame upper skirt squeezes downward until the edges overlap and the tulip flame disappears. At Td = 20min, the flame velocity and shape are similar to that be obtained in the homogeneous concentration case, indicating the methane-air mixtures are nearly homogeneity. Moreover, for the case of CCH4 = 7%, the asymmetric double tulip flame is also found. However, the disappearance of tulip flame is caused by the acceleration of tulip tip, filling up the hollow area. The formation of asymmetric double tulip flame may be attributed to the R-T instabilities.

Suggested Citation

  • Sun, Xuxu & Lu, Shouxiang, 2020. "On the mechanisms of flame propagation in methane-air mixtures with concentration gradient," Energy, Elsevier, vol. 202(C).
    • Handle: RePEc:eee:energy:v:202:y:2020:i:c:s0360544220308896
    DOI: 10.1016/j.energy.2020.117782
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    Citations

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    Cited by:

    1. Wenhao Tan & Longxi Zheng & Jie Lu & Lingyi Wang & Daoen Zhou, 2022. "Experimental Investigations on Detonation Initiation Characteristics of a Liquid-Fueled Pulse Detonation Combustor at Different Inlet Air Temperatures," Energies, MDPI, vol. 15(23), pages 1-16, December.
    2. Liu, Guilong & Wang, Jian & Zheng, Ligang & Pan, Rongkun & Lu, Chang & Wang, Yan & Zhao, Yongxian & Li, Yanjie, 2023. "Effect of hydrogen addition on explosion characteristics of premixed methane/air mixture under different equivalence ratio distributions," Energy, Elsevier, vol. 276(C).
    3. Huadao Xing & Runze Yu & Guangan Xu & Xiaodong Li & Yanyu Qiu & Derong Wang & Bin Li & Lifeng Xie, 2022. "Theoretical and Experimental Investigation of Explosion Characteristics of Hydrogen Explosion in a Closed Vessel," Energies, MDPI, vol. 15(22), pages 1-14, November.

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